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He X, Matsuki S, Li K, Sui Y, Matsuno K, Ren M, Sutter G, Hofmann BM. Pharmacokinetics, safety, and tolerability of the novel tetrameric gadolinium-based MRI contrast agent gadoquatrane in healthy Chinese and Japanese men: Two randomized dose-escalation studies including concentration-QTc modeling. Eur J Pharm Sci 2024; 196:106749. [PMID: 38499113 DOI: 10.1016/j.ejps.2024.106749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 02/23/2024] [Accepted: 03/12/2024] [Indexed: 03/20/2024]
Abstract
PURPOSE To investigate the pharmacokinetics, safety, and tolerability of the novel tetrameric high-relaxivity gadolinium-based contrast agent gadoquatrane in Japanese (Study 1) and Chinese men (Study 2). PARTICIPANTS AND METHODS In two similarly designed single-center, randomized, single-blind, placebo-controlled, consecutive-cohort dose-escalation studies, healthy volunteers were randomly assigned to intravenous administration of gadoquatrane (0.01-0.1 mmol gadolinium/kg body weight) or placebo. Study procedures included blood sampling and collection of urine for pharmacokinetic analyses and safety assessments. RESULTS Twenty-five healthy Japanese men (mean age ± standard deviation: 26±5.9 years) and 23 healthy Chinese men (31±7.6 years old) were evaluated. In both studies, the pharmacokinetic profile of gadoquatrane was characterized by rapid distribution of the drug into the extracellular space and fast renal elimination. Postdose gadolinium concentrations rapidly declined with a geometric mean effective half-life of 1.3-1.4 h. The exposure increased approximately dose-proportionally with dose. The body weight-normalized volume of distribution was constant across dose levels (0.21-0.24 L/kg). Total recovery of gadolinium in urine amounted to 82-95 % (Study 1) and 96-99 % (Study 2) of the dose administered. Only a few mild, transient adverse events were reported, none of which gave rise to any safety concerns. Exploratory drug concentration-QTc modeling indicated no risk of a clinically relevant QT/QTc prolongation at the anticipated diagnostic dose. CONCLUSION Gadoquatrane was safe and well tolerated at all doses tested. The pharmacokinetic profile was essentially the same as that of other extracellular macrocyclic gadolinium-based contrast agents and was consequentially also similar for Japanese and Chinese participants.
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Affiliation(s)
- Xuemei He
- Clinical Trial Center, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Key Laboratory of Assessment of Clinical Drugs Risk and Individual Application, Beijing, PR China
| | | | - Kexin Li
- Clinical Trial Center, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Key Laboratory of Assessment of Clinical Drugs Risk and Individual Application, Beijing, PR China
| | - Yubin Sui
- Bayer Healthcare Co. Ltd., Research & Development Beijing, Pharmaceuticals, Clinical Pharmacology Asia, 6F, Tower B, Parkview Green, No.9, Dongdaqiao Road, Chaoyang District, Beijing, 100020, PR China.
| | - Kumi Matsuno
- Bayer Yakuhin, Ltd., Research & Development Japan, Translational Science, Clinical Pharmacology, 2-4-9 Umeda, Kita-ku Osaka, 530-0001, Japan.
| | - Mengyuan Ren
- Bayer Healthcare Co. Ltd., Research & Development Beijing, Pharmaceuticals, Clinical Pharmacology Asia, 6F, Tower B, Parkview Green, No.9, Dongdaqiao Road, Chaoyang District, Beijing, 100020, PR China
| | - Gabriele Sutter
- Bayer AG, Radiology, Pharmaceuticals, Muellerstr. 178, 13352, Berlin, Germany
| | - Birte Maria Hofmann
- Bayer AG, Radiology, Pharmaceuticals, Muellerstr. 178, 13352, Berlin, Germany
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Shimbashi S, Takeuchi A, Yoshimiya M, Jin S, Matoba K, Hyodoh H. Postmortem contrast-enhanced computed tomography via direct large-vessel puncture. Leg Med (Tokyo) 2024; 69:102448. [PMID: 38640871 DOI: 10.1016/j.legalmed.2024.102448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 03/06/2024] [Accepted: 04/15/2024] [Indexed: 04/21/2024]
Abstract
The aim of this study was to assess the usefulness of postmortem contrast-enhanced CT (PMeCT) performed via direct large-vessel puncture when routine postmortem CT suggests a vascular lesion as the cause of death. PMeCT was performed in 9 cases (4 male, 5 female) with a mean age of 76 years (range 52-92) at the time of death. The mean time elapsed since death was 29.1 h (12.0-72.0). The location of the target vessel for puncture was determined based on the CT table position and a grid placed on the body surface. An 18-G spinal needle was advanced to the puncture site, and the needle tip was confirmed to have reached the intended blood vessel. Using negative pressure with a 20-ml syringe, the needle tip was advanced until reverse bleeding was confirmed. Diluted contrast medium was injected slowly to ensure its dispersion within the blood vessels. Following confirmation of no extravasation, additional doses of diluted contrast agent were injected in 3-4 divided doses, with CT scans obtained at each step to track the distribution of contrast agent over time. PMeCT was successful in all cases, revealing cardiac tamponade in 7 (ascending aortic dissection, n = 6; cardiac rupture, n = 1), thoracic aortic aneurysm rupture, n = 1, and iliac artery aneurysm rupture, n = 1. There were no cases of procedure-related extravasation (pseudo-lesions). When postmortem CT reveals pericardial hematoma or bleeding in the thoracic or abdominal cavity, PMeCT can identify the source of bleeding.
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Affiliation(s)
- Shogo Shimbashi
- University of Fukui School of Medical Sciences, Department of Forensic Medicine, Japan.
| | - Akiko Takeuchi
- Hokkaido University, Faculty of Medicine, Center for Cause of Death Investigation, Japan.
| | - Motoo Yoshimiya
- University of Fukui School of Medical Sciences, Department of Forensic Medicine, Japan.
| | - Shigeki Jin
- Hokkaido University, Faculty of Medicine, Department of Forensic Medicine, Japan.
| | - Kotaro Matoba
- Hokkaido University, Faculty of Medicine, Department of Forensic Medicine, Japan.
| | - Hideki Hyodoh
- University of Fukui School of Medical Sciences, Department of Forensic Medicine, Japan; Hokkaido University, Faculty of Medicine, Department of Forensic Medicine, Japan.
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Weng N, Wei B, Li G, Yin R, Xin W, Liu C, Li H, Shao C, Jiang T, Wang X. Fluorescence and magnetic resonance imaging of ONL-93 cells in a rat model of ischemic. Magn Reson Imaging 2024; 107:111-119. [PMID: 38185391 DOI: 10.1016/j.mri.2023.12.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 07/04/2023] [Accepted: 12/28/2023] [Indexed: 01/09/2024]
Abstract
OBJECTIVES The current methods for detecting myelin changes in ischemic stroke are indirect and cannot accurately reflect their status. This study aimed to develop a novel fluorescent-magnetic resonance dual-modal molecular imaging probe for direct imaging of myelin. METHODS Compounds 7a and 7b were synthesized by linking the MeDAS group and Gadolinium (III) 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetate. Compound 7a was selected for characterization and further study. Cell uptake, cytotoxicity, and magnetic resonance imaging scans were performed on cells. In vitro experiments on frozen brain sections from 7-day-old, 8-week-old, and ischemic stroke rats were compared with commercially available Luxol Fast Blue staining. After HPLC and MR scanning, brain tissue was soaked in 7a and scanned using T1WI and T1maps sequences. RESULTS Spectrophotometer results showed that compounds 7a and 7b had fluorescent properties. MR scans indicated that the compounds had contrast agent properties. Cells could uptake 7a and exhibited high signals in imaging scans. Compound 7a brain tissue staining showed more fluorescence in myelin-rich regions and identified injury sites in ischemic stroke rats. MR scanning of brain sections provided clear myelin contrast. CONCLUSION A novel fluorescent-magnetic resonance dual-modal molecular imaging probe for direct imaging of myelin was successfully developed and tested in rats with ischemic stroke. These findings provide new insights for the clinical diagnosis of demyelinating diseases.
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Affiliation(s)
- Na Weng
- Department of Nuclear medicine, Binzhou Medical University Hospital, Binzhou, Shandong 256603, China
| | - Bin Wei
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Guodong Li
- Department of Nuclear medicine, Binzhou Medical University Hospital, Binzhou, Shandong 256603, China
| | - Ruijuan Yin
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Wenbin Xin
- Department of Nuclear medicine, Binzhou Medical University Hospital, Binzhou, Shandong 256603, China
| | - Caiyun Liu
- Department of Nuclear medicine, Binzhou Medical University Hospital, Binzhou, Shandong 256603, China
| | - Hao Li
- School of Medical Imaging, Binzhou Medical University, Yantai, Shandong 264003, China
| | - Cuijie Shao
- Medical Research Center, Binzhou Medical University Hospital, Binzhou 256600, China.
| | - Tao Jiang
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.
| | - Xu Wang
- Department of Nuclear medicine, Binzhou Medical University Hospital, Binzhou, Shandong 256603, China.
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Monsivais H, Yeh CL, Edmondson A, Harold R, Snyder S, Wells EM, Schmidt-Wilcke T, Foti D, Zauber SE, Dydak U. Whole-brain mapping of increased manganese levels in welders and its association with exposure and motor function. Neuroimage 2024; 288:120523. [PMID: 38278427 DOI: 10.1016/j.neuroimage.2024.120523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 12/29/2023] [Accepted: 01/23/2024] [Indexed: 01/28/2024] Open
Abstract
Although manganese (Mn) is a trace metal essential for humans, chronic exposure to Mn can cause accumulation of this metal ion in the brain leading to an increased risk of neurological and neurobehavioral health effects. This is a concern for welders exposed to Mn through welding fumes. While brain Mn accumulation in occupational settings has mostly been reported in the basal ganglia, several imaging studies also revealed elevated Mn in other brain areas. Since Mn functions as a magnetic resonance imaging (MRI) T1 contrast agent, we developed a whole-brain MRI approach to map in vivo Mn deposition differences in the brains of non-exposed factory controls and exposed welders. This is a cross-sectional analysis of 23 non-exposed factory controls and 36 exposed full-time welders from the same truck manufacturer. We collected high-resolution 3D MRIs of brain anatomy and R1 relaxation maps to identify regional differences using voxel-based quantification (VBQ) and statistical parametric mapping. Furthermore, we investigated the associations between excess Mn deposition and neuropsychological and motor test performance. Our results indicate that: (1) Using whole-brain MRI relaxometry methods we can generate excess Mn deposition maps in vivo, (2) excess Mn accumulation due to occupational exposure occurs beyond the basal ganglia in cortical areas associated with motor and cognitive functions, (3) Mn likely diffuses along white matter tracts in the brain, and (4) Mn deposition in specific brain regions is associated with exposure (cerebellum and frontal cortex) and motor metrics (cerebellum and hippocampus).
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Affiliation(s)
| | - Chien-Lin Yeh
- School of Health Sciences, Purdue University, West Lafayette, IN, USA; Takeda Pharmaceutical Company Ltd, Cambridge, MA, USA
| | - Alex Edmondson
- Cincinnati Children's Hospital Medical Center, Imaging Research Center, Cincinnati, OH, USA; University of Cincinnati College of Medicine, Department of Environmental and Public Health Sciences, Cincinnati, OH USA
| | - Roslyn Harold
- Department of Psychological Sciences, Purdue University, West Lafayette, IN, USA
| | - Sandy Snyder
- School of Health Sciences, Purdue University, West Lafayette, IN, USA; Department of Speech, Language and Hearing Sciences, Purdue University, West Lafayette, IN, USA
| | - Ellen M Wells
- School of Health Sciences, Purdue University, West Lafayette, IN, USA; Department of Public Health, Purdue University, West Lafayette, IN, USA
| | - Tobias Schmidt-Wilcke
- Department of Neurology, St. Mauritius Therapieklinik, Meerbusch, Germany; Institute of Clinical Neuroscience and Medical Psychology, Universitätsklinikum Düsseldorf, Düsseldorf, Germany
| | - Dan Foti
- Department of Psychological Sciences, Purdue University, West Lafayette, IN, USA
| | - S Elizabeth Zauber
- Department of Neurology, Indiana University School of Medicine, Indianapolis, USA
| | - Ulrike Dydak
- School of Health Sciences, Purdue University, West Lafayette, IN, USA; Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, IN, USA.
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Rotzinger DC, Magnin V, van der Wal AC, Grabherr S, Qanadli SD, Michaud K. Coronary CT angiography for the assessment of atherosclerotic plaque inflammation: postmortem proof of concept with histological validation. Eur Radiol 2024; 34:1755-1763. [PMID: 37658143 PMCID: PMC10873449 DOI: 10.1007/s00330-023-10169-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Revised: 06/29/2023] [Accepted: 07/23/2023] [Indexed: 09/03/2023]
Abstract
OBJECTIVES To evaluate the diagnostic utility of multiphase postmortem CT angiography (PMCTA) to detect plaque enhancement as a surrogate marker of inflammation, using fatal coronary plaques obtained from autopsies following sudden cardiac death. METHODS In this retrospective study, we included 35 cases (12 women, 34%; median [IQR] age, 52 [11] years), with autopsy-proven coronary thrombosis, histological examination, and multiphase PMCTA. Two radiologists blinded towards histological findings assessed PMCTA for plaque enhancement of the culprit lesion in consensus. Two forensic pathologists determined the culprit lesion and assessed histological samples in consensus. Cases with concomitant vasa vasorum density increase and intraplaque and periadventital inflammation were considered positive for plaque inflammation. Finally, we correlated radiology and pathology findings. RESULTS All 35 cases had histological evidence of atherosclerotic plaque disruption and thrombosis; 30 (85.7%) had plaque inflammation. Plaque enhancement at multiphase PMCTA was reported in 21 (60%) and resulted in a PPV of 95.2% (77.3-99.2%) and an NPV of 28.6% (17-43.9%). Median histological ratings indicated higher intraplaque inflammation (p = .024) and vasa vasorum density (p = .032) in plaques with enhancement. We found no evidence of a difference in adventitial inflammation between CT-negative and CT-positive plaques (p = .211). CONCLUSIONS Plaque enhancement was found in 2/3 of fatal atherothrombotic occlusions at coronary postmortem CT angiography. Furthermore, plaque enhancement correlated with histopathological plaque inflammation and increased vasa vasorum density. Plaque enhancement on multiphase CT angiography could potentially serve as a noninvasive marker of inflammation in high-risk populations. CLINICAL RELEVANCE STATEMENT Phenotyping coronary plaque more comprehensively is one of the principal challenges cardiac imaging is facing. Translating our ex vivo findings of CT-based plaque inflammation assessment into clinical studies might help pave the way in defining high-risk plaque better. KEY POINTS • Most thrombosed coronary plaques leading to fatality in our series had histological signs of inflammation. • Multiphase postmortem CT angiography can provide a noninvasive interrogation of plaque inflammation through contrast enhancement. • Atherosclerotic plaque enhancement at multiphase postmortem CT angiography correlated with histopathological signs of plaque inflammation and could potentially serve as an imaging biological marker of plaque vulnerability.
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Affiliation(s)
- David C Rotzinger
- Division of Cardiothoracic and Vascular Imaging, Department of Diagnostic and Interventional Radiology, Lausanne University Hospital (CHUV), Rue du Bugnon 46, Lausanne, Switzerland.
- Faculty of Biology and Medicine (FBM), University of Lausanne (UNIL), Lausanne, Switzerland.
| | - Virginie Magnin
- Faculty of Biology and Medicine (FBM), University of Lausanne (UNIL), Lausanne, Switzerland
- University Center of Legal Medicine Lausanne-Geneva, Chemin de La Vulliette 4, Lausanne, Switzerland
- University Hospital of Lausanne (CHUV), Rue du Bugnon 46, 1011, Lausanne, Switzerland
| | - Allard C van der Wal
- Department of Pathology, Amsterdam University Medical Centers (AUMC), University of Amsterdam, Amsterdam, The Netherlands
| | - Silke Grabherr
- Faculty of Biology and Medicine (FBM), University of Lausanne (UNIL), Lausanne, Switzerland
- University Center of Legal Medicine Lausanne-Geneva, Chemin de La Vulliette 4, Lausanne, Switzerland
- University Hospital of Lausanne (CHUV), Rue du Bugnon 46, 1011, Lausanne, Switzerland
| | - Salah D Qanadli
- Faculty of Biology and Medicine (FBM), University of Lausanne (UNIL), Lausanne, Switzerland
- Riviera-Chablais Hospital (HRC), 1847, Rennaz, Switzerland
| | - Katarzyna Michaud
- Faculty of Biology and Medicine (FBM), University of Lausanne (UNIL), Lausanne, Switzerland
- University Center of Legal Medicine Lausanne-Geneva, Chemin de La Vulliette 4, Lausanne, Switzerland
- University Hospital of Lausanne (CHUV), Rue du Bugnon 46, 1011, Lausanne, Switzerland
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Sun L, Luan S, Ye X, Chen J, Shi J, Zhu H, Dong H, Tao G, Liu X, Zhu L, Yu H. Combination of Contrast-enhanced FlAIR and Contrast-enhanced T1WI: A Quick and Efficient Method in Detecting Brain Metastases of Lung Cancers. Curr Med Imaging 2024; 20:CMIR-EPUB-138849. [PMID: 38449070 DOI: 10.2174/0115734056288838240201040400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 01/22/2024] [Accepted: 01/29/2024] [Indexed: 03/08/2024]
Abstract
BACKGROUND Some patients with suspected brain metastases (BM) could not tolerate longer scanning examinations according to the standardized MRI protocol. OBJECTIVE The purpose of this study was to evaluate the clinical value of contrast-enhanced fast fluid-attenuated inversion recovery (CE FLAIR) imaging in combination with contrast-enhanced T1 weighted imaging (CE T1WI) in detecting BM of lung cancer and explore a quick and effective MRI protocol. MATERIAL AND METHODS In 201 patients with lung cancers and suspected BM, T1WI and FLAIR were performed before and after administration of gadopentetate dimeglumine. Two radiologists reviewed pre- and post-contrast images to determine the presence of abnormal contrast enhancement or signal intensity and decided whether it was metastatic or not on CE T1WI (Group 1) and CE FLAIR (Group 2). The number, locations and features of abnormal findings in two groups were recorded. Receiver Operating Characteristic (ROC) analyses were conducted in three groups: Group 1, 2 and 3(combination of CE FLAIR and CE T1WI). RESULTS A total of 714 abnormal findings were revealed, of which 672 were considered as BM and 42 nonmetastatic. Superficial and small metastases(≤10mm) in parenchyma and ependyma, leptomeningeal and non-expansive skull metastases were typically better seen on CE FLAIR. The areas under ROC in the three groups were 0.720,0.887 and 0.973, respectively. Group 3 was significantly better in diagnostic efficiency of BMs than Group 1 (p<0.0001) or Group 2 (p=0.0006). CONCLUSION The combination of CE T1WI and CE FLAIR promotes diagnostic performance and results in better observation and characterization of BM in patients with lung cancers. It provides a quick and efficient way of detecting BM.
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Affiliation(s)
- Linlin Sun
- Department of Radiology, Shanghai Chest Hospital, School of Medicine, Shanghai Jiao Tong University , Shanghai, PR, China
| | - Shihai Luan
- Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai, PR, China
- Institute of Neurosurgery, Fudan University, Shanghai, PR, China
- Shanghai Key Laboratory of Brain Function Restoration and Neural Regeneration, Fudan University, Shanghai, PR, China
| | - Xiaodan Ye
- Department of Radiology, Zhongshan Hospital, Fudan University, Shanghai, PR, China
| | - Jing Chen
- Department of Radiology, Shanghai Chest Hospital, School of Medicine, Shanghai Jiao Tong University , Shanghai, PR, China
| | - Jueqian Shi
- Department of Radiology, Shanghai Chest Hospital, School of Medicine, Shanghai Jiao Tong University , Shanghai, PR, China
| | - Huiyuan Zhu
- Department of Radiology, Shanghai Chest Hospital, School of Medicine, Shanghai Jiao Tong University , Shanghai, PR, China
| | - Haiyang Dong
- Department of Radiology, Shanghai Chest Hospital, School of Medicine, Shanghai Jiao Tong University , Shanghai, PR, China
| | - Guangyu Tao
- Department of Radiology, Shanghai Chest Hospital, School of Medicine, Shanghai Jiao Tong University , Shanghai, PR, China
| | - Xuemei Liu
- Department of Radiology, Shanghai Chest Hospital, School of Medicine, Shanghai Jiao Tong University , Shanghai, PR, China
| | - Li Zhu
- Department of Radiology, Shanghai Chest Hospital, School of Medicine, Shanghai Jiao Tong University , Shanghai, PR, China
| | - Hong Yu
- Department of Radiology, Shanghai Chest Hospital, School of Medicine, Shanghai Jiao Tong University , Shanghai, PR, China
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Udeneev AM, Kalyagina NA, Efendiev KT, Febenchukova AA, Kulichenko AM, Shiryaev AA, Pisareva TN, Linkov KG, Loshchenov MV. Cost-effective device for locating and circumscribing superficial tumors with contrast enhancement and fluorescence quantification. Photodiagnosis Photodyn Ther 2024; 45:103827. [PMID: 37797909 DOI: 10.1016/j.pdpdt.2023.103827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 09/29/2023] [Accepted: 10/02/2023] [Indexed: 10/07/2023]
Abstract
BACKGROUND Two Bispectral contrast enhancement approaches for the fluorescence diagnosis with chlorine-e6 and a wide field-of-view imaging system with fluorescence excitation at 405 nm and time-resolved background suppression were analyzed and compared. METHODS Two techniques for the contrast enhancement of a fluorescent video system (Red/Green (R/G) ratio and Red-Green (R-G)) with time-resolved background suppression for fluorescent diagnosis (FD) were tested in four patients with basal cell carcinoma (BCC). RESULTS The results of both contrast enhancement methods were compared for the diagnostic efficiency for FD of BCC. Both techniques successfully determined the boundaries of the lesions and the fluorescence intensity. CONCLUSIONS Both contrast enhancement modes have proven effective in identifying tumor borders in cases of low contrast in BCC FD with Ce6. While the Red/Green (R/G) mode provides sharper lesion borders, the Red minus Green (R-G) mode visualizes more fluorescent features and makes it easier to assess the lesion margins.
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Affiliation(s)
- A M Udeneev
- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute MEPhI), Kashirskoye shosse 31, Moscow, 115409, Russia.
| | - N A Kalyagina
- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute MEPhI), Kashirskoye shosse 31, Moscow, 115409, Russia; Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilova Str., 38, Moscow, 119991, Russia
| | - K T Efendiev
- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute MEPhI), Kashirskoye shosse 31, Moscow, 115409, Russia; Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilova Str., 38, Moscow, 119991, Russia
| | - A A Febenchukova
- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute MEPhI), Kashirskoye shosse 31, Moscow, 115409, Russia
| | - A M Kulichenko
- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute MEPhI), Kashirskoye shosse 31, Moscow, 115409, Russia; Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilova Str., 38, Moscow, 119991, Russia
| | - A A Shiryaev
- Sechenov First Moscow State Medical University (Sechenov University), Ministry of Health of the Russian Federation, Department of Oncology, Radiotherapy and Reconstructive Surgery, University Clinical Hospital No.1, Bolshaya Pirogovskaya Str., 6, Moscow, 119435, Russia
| | - T N Pisareva
- Sechenov First Moscow State Medical University (Sechenov University), Ministry of Health of the Russian Federation, Department of Oncology, Radiotherapy and Reconstructive Surgery, University Clinical Hospital No.1, Bolshaya Pirogovskaya Str., 6, Moscow, 119435, Russia
| | - K G Linkov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilova Str., 38, Moscow, 119991, Russia
| | - M V Loshchenov
- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute MEPhI), Kashirskoye shosse 31, Moscow, 115409, Russia
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Erber B, Hesse N, Goller S, Gilbert F, Ricke J, Glaser C, Heuck A. Diagnostic performance and interreader agreement of individual and combined non-enhanced and contrast-enhanced MR imaging parameters in adhesive capsulitis of the shoulder. Skeletal Radiol 2024; 53:263-273. [PMID: 37400604 PMCID: PMC10730686 DOI: 10.1007/s00256-023-04391-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 06/13/2023] [Accepted: 06/17/2023] [Indexed: 07/05/2023]
Abstract
OBJECTIVE The aims of our study were to analyze agreement among readers with different levels of expertise and diagnostic performance of individual and combined imaging signs for the diagnosis of adhesive capsulitis of the shoulder. METHODS In a retrospective study, contrast-enhanced shoulder MRIs of 60 patients with and 120 without clinically diagnosed adhesive capsulitis were evaluated by three readers independently. As non-enhanced imaging signs, readers evaluated signal intensity and thickness of the axillary recess capsule, thickness of the rotator interval capsule and the coracohumeral ligament as well as obliteration of subcoracoid fat. Furthermore, contrast enhancement of axillary recess and rotator interval capsule were evaluated. Data analysis included interreader reliability, ROC analysis, and logistic regression (p < 0.05). RESULTS Contrast-enhanced parameters showed substantially higher agreement among readers (ICC 0.79-0.80) than non-enhanced parameters (0.37-0.45). AUCs of contrast-enhanced signs (95.1-96.6%) were significantly higher (p < 0.01) than of non-enhanced imaging signs (61.5-85.9%) when considered individually. Combined evaluation of axillary recess signal intensity and thicknesses of axillary recess or rotator interval-when at least one of two signs was rated positive-increased accuracy compared to individual imaging signs, however not statistically significant. CONCLUSION Contrast-enhanced imaging signs show both distinctly higher agreement among readers and distinctly higher diagnostic performance compared to non-enhanced imaging signs based on the imaging protocol used in this study. Combined evaluation of parameters showed a tendency to increase discrimination; however, the effect on diagnosis of ACS was not statistically significant.
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Affiliation(s)
- Bernd Erber
- Department of Radiology, University Hospital, LMU Munich, Marchioninistr. 15, 81377, Munich, Germany.
| | - Nina Hesse
- Department of Radiology, University Hospital, LMU Munich, Marchioninistr. 15, 81377, Munich, Germany
| | - Sophia Goller
- Department of Radiology, University Hospital, LMU Munich, Marchioninistr. 15, 81377, Munich, Germany
| | - Fabian Gilbert
- Department of Orthopaedics and Trauma Surgery, Musculoskeletal University Center Munich (MUM), University Hospital, LMU Munich, 81377, Munich, Germany
| | - Jens Ricke
- Department of Radiology, University Hospital, LMU Munich, Marchioninistr. 15, 81377, Munich, Germany
| | - Christian Glaser
- Radiologisches Zentrum München, Pippinger Str. 25, 81245, Munich, Germany
| | - Andreas Heuck
- Department of Radiology, University Hospital, LMU Munich, Marchioninistr. 15, 81377, Munich, Germany
- Radiologisches Zentrum München, Pippinger Str. 25, 81245, Munich, Germany
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Ikenaga H, Masuda T, Yamamoto A, Moriwake R, Yoshida K, Ishikawa T, Yao D, Ono A, Hiratsuka J, Tamada T. Influence of splenomegaly on aortic and liver parenchymal CT numbers during contrast-enhance CT in patients with cirrhosis. Radiography (Lond) 2024; 30:382-387. [PMID: 38150883 DOI: 10.1016/j.radi.2023.12.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Revised: 12/05/2023] [Accepted: 12/10/2023] [Indexed: 12/29/2023]
Abstract
INTRODUCTION To compare CT (computed tomography) values for enhancement of the abdominal aorta and liver parenchyma during dynamic contrast enhancement (CE) CT in cirrhotic patients with and without splenomegaly (SM). METHODS We considered 258 patients (83 males and 46 females for the splenomegaly group, and 83 males and 46 females for the control group) for this retrospective study. We measured CT values in the abdominal aorta and hepatic parenchyma during the hepatic arterial (HAP) and portal venous (PVP) phases. The aortic CE at HAP and the hepatic parenchymal CE at PVP were compared between the two groups. For success rate of scans, we also calculated the optimal CE rates (>280 HU in the abdominal aorta and >50 HU in the hepatic parenchyma) for each group. RESULTS In the SM group, the CE for abdominal aorta was decreased during the aortic phase for a dynamic CE-CT (p < 0.05). When evaluating the success rates, they were found to be 65.1 % and 58.9 % in the SM group and 81.4 % and 72.3 % in the non-SM group (p < 0.05). CONCLUSION The success rate of scans and CE for the abdominal aorta during the aortic phase exhibited a significant decrease during dynamic CE-CT scans on patients with SM. Patients with SM may have reduced diagnostic ability with typical contrast injection protocols. IMPLICATIONS FOR PRACTICE It may be necessary to change the injection rates and contrast medium volume during CE-CT depending on the presence or absence of SM.
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Affiliation(s)
- H Ikenaga
- Department of Radiological Technology, Kawasaki Medical School Hospital, 577, Matsushima, Kurashiki-city, Okayama, 701-0192, Japan
| | - T Masuda
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki, Okayama, 701-0193, Japan.
| | - A Yamamoto
- Department of Radiology, Kawasaki Medical School, 577, Matsushima, Kurashiki-city, Okayama, 701-0192, Japan
| | - R Moriwake
- Department of Radiological Technology, Kawasaki Medical School Hospital, 577, Matsushima, Kurashiki-city, Okayama, 701-0192, Japan
| | - K Yoshida
- Department of Radiological Technology, Kawasaki Medical School Hospital, 577, Matsushima, Kurashiki-city, Okayama, 701-0192, Japan
| | - T Ishikawa
- Department of Radiological Technology, Kawasaki Medical School Hospital, 577, Matsushima, Kurashiki-city, Okayama, 701-0192, Japan
| | - D Yao
- Department of Radiological Technology, Kawasaki Medical School Hospital, 577, Matsushima, Kurashiki-city, Okayama, 701-0192, Japan
| | - A Ono
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki, Okayama, 701-0193, Japan
| | - J Hiratsuka
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki, Okayama, 701-0193, Japan
| | - T Tamada
- Department of Radiology, Kawasaki Medical School, 577, Matsushima, Kurashiki-city, Okayama, 701-0192, Japan
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Yoshiura T, Masuda T, Kobayashi Y, Kikuhara Y, Ishibashi T, Nonaka H, Oku T, Sato T, Funama Y. Iodine contrast volume reduction in preoperative transcatheter aortic valve implantation computed tomography: Comparison with 64- and 256-multidetector row computed tomography. Radiography (Lond) 2024; 30:408-415. [PMID: 38176131 DOI: 10.1016/j.radi.2023.12.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 12/24/2023] [Accepted: 12/25/2023] [Indexed: 01/06/2024]
Abstract
INTRODUCTION This study aimed to compare the vascular enhancement and radiation dose in preoperative transcatheter aortic valve implantation (TAVI) computed tomography (CT) with a reduced contrast medium (CM) using volume scans in 256-multidetector row CT (MDCT) with a standard CM using 64-MDCT. METHODS This study included 78 patients with preoperative TAVI CT with either 64- or 256-MDCT. The CM was injected at 1.5 mL/kg in the 64-MDCT group and 1.0 mL/kg in the 256-MDCT group. We compared vascular enhancement of the aortic root and access routes, image quality (IQ) scores, and radiation dose in both groups. RESULTS Despite the reduced CM (by 33 %) in the 256-MDCT group, the mean vascular enhancement of the right and left subclavian arteries was significantly higher than that in the 64-MDCT group [284 and 267 Hounsfield units (HU) vs. 376 and 359 HU; p < 0.05]; however, no significant differences in the mean vascular enhancement in the ascending aorta, abdominal aorta at the celiac level, and bilateral common femoral arteries were observed between the two groups (p > 0.05 for all). The median IQ scores at the aortic root were higher in the 256-MDCT group than in the 64-MDCT group (3 vs. 4; p < 0.05), and those at the femoral access routes were comparable (4 vs. 4; p = 0.33). The mean effective dose was significantly reduced by 30 % in the 256-MDCT group (23.6 vs. 16.3 mSv; p < 0.05). CONCLUSION In preoperative TAVI CT, volume scans using 256-MDCT provide comparable or better vascular enhancement and IQ with a 30 % reduction in CM and radiation dose than those using 64-MDCT. IMPLICATIONS FOR PRACTICE Volume scan using 256-MDCT for preoperative TAVI CT may reduce CM and radiation dose in TAVI patients with renal dysfunction.
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Affiliation(s)
- T Yoshiura
- Graduate School of Health Sciences, Kumamoto University, Kuhonji 4-24-1, Chuo-ku, Kumamoto, 860-0976, Japan; Department of Medical Technology, Tsuchiya General Hospital, Nakajima-cho 3-30, Naka-ku, Hiroshima, 730-8655, Japan.
| | - T Masuda
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Matsushima 288, Okayama, 701-0193, Japan.
| | - Y Kobayashi
- Department of Medical Technology, Tsuchiya General Hospital, Nakajima-cho 3-30, Naka-ku, Hiroshima, 730-8655, Japan.
| | - Y Kikuhara
- Department of Medical Technology, Tsuchiya General Hospital, Nakajima-cho 3-30, Naka-ku, Hiroshima, 730-8655, Japan.
| | - T Ishibashi
- Department of Medical Technology, Tsuchiya General Hospital, Nakajima-cho 3-30, Naka-ku, Hiroshima, 730-8655, Japan.
| | - H Nonaka
- Department of Medical Technology, Tsuchiya General Hospital, Nakajima-cho 3-30, Naka-ku, Hiroshima, 730-8655, Japan.
| | - T Oku
- Department of Medical Technology, Tsuchiya General Hospital, Nakajima-cho 3-30, Naka-ku, Hiroshima, 730-8655, Japan.
| | - T Sato
- Department of Medical Technology, Tsuchiya General Hospital, Nakajima-cho 3-30, Naka-ku, Hiroshima, 730-8655, Japan.
| | - Y Funama
- Department of Medical Radiation Sciences, Faculty of Life Sciences, Kumamoto University, Honjo 1-1-1, Chuo-ku, Kumamoto, 860-8556, Japan.
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Bai L, Guo C, Ye T, Xu J. Ultrasonic array imaging of porosity defects with contrast enhancement based on dominant response subtraction. Ultrasonics 2023; 135:107109. [PMID: 37515838 DOI: 10.1016/j.ultras.2023.107109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 06/04/2023] [Accepted: 07/14/2023] [Indexed: 07/31/2023]
Abstract
Porosity defects can be found in many engineering structures and their inspection remains a challenge in the field of ultrasonic non-destructive testing. In this paper, ultrasonic array imaging of porosity defects has been studied with the aim of improving the image quality in the "dead zone", which is caused by the masking effects of the uppermost pores. The proposed approach first extracts contributions of the uppermost pores based on a single scattering model by adopting convolutional sparse coding. The extracted dominant contributions are then subtracted from the array data before forming an image, facilitating detection and localization of pores in the shadow zone. The performance of the proposed approach has been studied in simulation and experiments, and the mean localization errors of the pores are small (i.e., within 0.27 mm or 0.14λ). In addition, the effects of measurement noise and imaging parameters on robustness of the imaging result have been analyzed, providing guidelines for practical implementation of the proposed approach.
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Affiliation(s)
- Long Bai
- State Key Laboratory of Intelligent Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Changrong Guo
- State Key Laboratory of Intelligent Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Tao Ye
- State Key Laboratory of Intelligent Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Jianfeng Xu
- State Key Laboratory of Intelligent Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
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12
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Dawudi Y, Pappa E, Hankiewicz K, De Broucker T, Bonnan M. Nitrous oxide myelopathy: A pernicious contrast enhancement. eNeurologicalSci 2023; 33:100479. [PMID: 37868951 PMCID: PMC10585348 DOI: 10.1016/j.ensci.2023.100479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 09/11/2023] [Accepted: 10/01/2023] [Indexed: 10/24/2023] Open
Affiliation(s)
- Yachar Dawudi
- Neurology Department, Centre Hospitalier de Saint-Denis, 2 Rue du Dr Delafontaine, 93200 Saint-Denis, France
| | - Evangelia Pappa
- Neurology Department, Centre Hospitalier de Saint-Denis, 2 Rue du Dr Delafontaine, 93200 Saint-Denis, France
| | - Karolina Hankiewicz
- Neurology Department, Centre Hospitalier de Saint-Denis, 2 Rue du Dr Delafontaine, 93200 Saint-Denis, France
| | - Thomas De Broucker
- Neurology Department, Centre Hospitalier de Saint-Denis, 2 Rue du Dr Delafontaine, 93200 Saint-Denis, France
| | - Mickael Bonnan
- Neurology Department, Centre Hospitalier de Saint-Denis, 2 Rue du Dr Delafontaine, 93200 Saint-Denis, France
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Hildebrand T, Novak J, Nogueira LP, Boccaccini AR, Haugen HJ. Durability assessment of hydrogel mountings for contrast-enhanced micro-CT. Micron 2023; 174:103533. [PMID: 37660476 DOI: 10.1016/j.micron.2023.103533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 08/17/2023] [Accepted: 08/28/2023] [Indexed: 09/05/2023]
Abstract
Micro-computed tomography (micro-CT) provides valuable data for studying soft tissue, though it is often affected by sample movement during scans and low contrast in X-ray absorption. This can result in lower image quality and geometric inaccuracies, collectively known as 'artefacts'. To mitigate these issues, samples can be embedded in hydrogels and enriched with heavy metals for contrast enhancement. However, the long-term durability of these enhancements remains largely unexplored. In this study, we examine the effects of two contrast enhancement agents - iodine and phosphotungstic acid (PTA) - and two hydrogels - agarose and Poloxamer 407 - over a 14-day period. We used Drosophila melanogaster as a test model for our investigation. Our findings reveal that PTA and agarose are highly durable, while iodine and poloxamer hydrogel exhibits higher leakage rates. These observations lay the foundation for estimating contrast stabilities in contrast-enhanced micro-CT with hydrogel embedding and serve to inform future research in this field.
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Affiliation(s)
- Torben Hildebrand
- Department of Biomaterials, Institute of Clinical Dentistry, Faculty of Dentistry, University of Oslo, Oslo 0317, Norway.
| | - Jan Novak
- Department of Biomaterials, Institute of Clinical Dentistry, Faculty of Dentistry, University of Oslo, Oslo 0317, Norway; Department of Materials Science and Engineering, Friedrich-Alexander-Universität, 91054 Erlangen, Germany
| | - Liebert Parreiras Nogueira
- Oral Research Laboratory, Institute of Clinical Dentistry, Faculty of Dentistry, University of Oslo, Oslo 0317, Norway
| | - Aldo Roberto Boccaccini
- Department of Materials Science and Engineering, Friedrich-Alexander-Universität, 91054 Erlangen, Germany
| | - Håvard Jostein Haugen
- Department of Biomaterials, Institute of Clinical Dentistry, Faculty of Dentistry, University of Oslo, Oslo 0317, Norway
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Kollem S, Prasad CR, Ajayan J, Sreejith S, Joseph LL, Krishna P. Segmentation of Brain MRI Images using Multi-Kernel FCM EHO Method. Curr Med Imaging 2023; 20:CMIR-EPUB-133935. [PMID: 38389383 DOI: 10.2174/1573405620666230822114029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2022] [Revised: 06/24/2023] [Accepted: 07/20/2023] [Indexed: 02/24/2024]
Abstract
BACKGROUND In image processing, image segmentation is a more challenging task due to different shapes, locations, image intensities, etc. Brain tumors are one of the most common diseases in the world. So, the detection and segmentation of brain tumors are important in the medical field. OBJECTIVE The primary goal of this work is to use the proposed methodology to segment brain MRI images into tumor and non-tumor segments or pixels. METHODS In this work, we first selected the MRI medical images from the BraTS2020 database and transferred them to the contrast enhancement phase. Then, we applied thresholding for contrast enhancement to enhance the visibility of structures like blood arteries, tumors, or abnormalities. After the contrast enhancement process, the images were transformed into the image denoising phase. In this phase, a fourth-order partial differential equation was used for image denoising. After the image denoising process, these images were passed on to the segmentation phase. In this segmentation phase, we used an elephant herding algorithm for centroid optimization and then applied the multi-kernel fuzzy c-means clustering for image segmentation. RESULTS Peak signal-to-noise ratio, mean square error, sensitivity, specificity, and accuracy were used to assess the performance of the proposed methods. According to the findings, the proposed strategy produced better outcomes than the conventional methods. CONCLUSION Our proposed methodology was reported to be a more effective technique than existing techniques.
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Affiliation(s)
- Sreedhar Kollem
- Department of ECE, School of Engineering, SR University, Warangal-506371, Telangana, India
| | - Ch Rajendra Prasad
- Department of ECE, School of Engineering, SR University, Warangal-506371, Telangana, India
| | - J Ajayan
- Department of ECE, School of Engineering, SR University, Warangal-506371, Telangana, India
| | - S Sreejith
- Department of AIML, New Horizon College of Engineering, Bengaluru-560103, Karnataka, India
| | - Lmi Leo Joseph
- Department of ECE, School of Engineering, SR University, Warangal-506371, Telangana, India
| | - Patteti Krishna
- Department of ECE, Netaji Subhas University of Technology East Campus (Formerly AIACTR), Geeta Colony, New Delhi-110031, India
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15
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Azarfar G, Ko SB, Adams SJ, Babyn PS. Applications of deep learning to reduce the need for iodinated contrast media for CT imaging: a systematic review. Int J Comput Assist Radiol Surg 2023; 18:1903-1914. [PMID: 36947337 DOI: 10.1007/s11548-023-02862-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 02/27/2023] [Indexed: 03/23/2023]
Abstract
PURPOSE The usage of iodinated contrast media (ICM) can improve the sensitivity and specificity of computed tomography (CT) for many clinical indications. However, the adverse effects of ICM administration can include renal injury, life-threatening allergic-like reactions, and environmental contamination. Deep learning (DL) models can generate full-dose ICM CT images from non-contrast or low-dose ICM administration or generate non-contrast CT from full-dose ICM CT. Eliminating the need for both contrast-enhanced and non-enhanced imaging or reducing the amount of required contrast while maintaining diagnostic capability may reduce overall patient risk, improve efficiency and minimize costs. We reviewed the current capabilities of DL to reduce the need for contrast administration in CT. METHODS We conducted a systematic review of articles utilizing DL to reduce the amount of ICM required in CT, searching MEDLINE, Embase, Compendex, Inspec, and Scopus to identify papers published from 2016 to 2022. We classified the articles based on the DL model and ICM reduction. RESULTS Eighteen papers met the inclusion criteria for analysis. Of these, ten generated synthetic full-dose (100%) ICM from real non-contrast CT, while four augmented low-dose to full-dose ICM CT. Three used DL to create synthetic non-contrast CT from real 100% ICM CT, while one paper used DL to translate the 100% ICM to non-contrast CT and vice versa. DL models commonly used generative adversarial networks trained and tested by paired contrast-enhanced and non-contrast or low ICM CTs. Image quality metrics such as peak signal-to-noise ratio and structural similarity index were frequently used for comparing synthetic versus real CT image quality. CONCLUSION DL-generated contrast-enhanced or non-contrast CT may assist in diagnosis and radiation therapy planning; however, further work to optimize protocols to reduce or eliminate ICM for specific pathology is still needed along with a dedicated assessment of the clinical utility of these synthetic images.
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Affiliation(s)
- Ghazal Azarfar
- Department of Medical Imaging, University of Saskatchewan, Saskatoon, SK, Canada.
- Department of Electrical and Computer Engineering, University of Saskatchewan, Saskatoon, SK, Canada.
| | - Seok-Bum Ko
- Department of Electrical and Computer Engineering, University of Saskatchewan, Saskatoon, SK, Canada
| | - Scott J Adams
- Department of Radiology, Stanford University, Stanford, CA, USA
| | - Paul S Babyn
- Department of Medical Imaging, University of Saskatchewan, Saskatoon, SK, Canada
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16
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Mnassri B, Echtioui A, Kallel F, Ben Hamida A, Dammak M, Mhiri C, Ben Mahfoudh K. New Contrast Enhancement Method for Multiple Sclerosis Lesion Detection. J Digit Imaging 2023; 36:468-485. [PMID: 36478312 PMCID: PMC10039218 DOI: 10.1007/s10278-022-00729-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Revised: 08/19/2022] [Accepted: 10/24/2022] [Indexed: 12/12/2022] Open
Abstract
Multiple sclerosis (MS) is one of the most serious neurological diseases. It is the most frequent reason of non-traumatic disability among young adults. MS is an autoimmune disease wherein the central nervous system wrongly destructs the myelin sheath surrounding and protecting axons of nerve cells of the brain and the spinal cord which results in presence of lesions called plaques. The damage of myelin sheath alters the normal transmission of nerve flow at the plaques level, consequently, a loss of communication between the brain and other organs. The consequence of this poor transmission of nerve impulses is the occurrence of various neurological symptoms. MS lesions cause mobility, vision, cognitive, and memory disorders. Indeed, early detection of lesions provides an accurate MS diagnosis. Consequently, and with the adequate treatment, clinicians will be able to deal effectively with the disease and reduce the number of relapses. Therefore, the use of magnetic resonance imaging (MRI) is primordial which is proven as the relevant imaging tool for early diagnosis of MS patients. But, low contrast MRI images can hide important objects in the image such lesions. In this paper, we propose a new automated contrast enhancement (CE) method to ameliorate the low contrast of MRI images for a better enhancement of MS lesions. This step is very important as it helps radiologists in confirming their diagnosis. The developed algorithm called BDS is based on Brightness Preserving Dynamic Fuzzy Histogram Equalization (BPDFHE) and Singular Value Decomposition with Discrete Wavelet Transform (SVD-DWT) techniques. BDS is dedicated to improve the low quality of MRI images with preservation of the brightness level and the edge details from degradation and without added artifacts or noise. These features are essential in CE approaches for a better lesion recognition. A modified version of BDS called MBDS is also implemented in the second part of this paper wherein we have proposed a new method for computing the correction factor. Indeed, with the use of the new correction factor, the entropy has been increased and the contrast is greatly enhanced. MBDS is specially dedicated for very low contrast MRI images. The experimental results proved the effectiveness of developed methods in improving low contrast of MRI images with preservation of brightness level and edge information. Moreover, performances of both proposed BDS and MBDS algorithms exceeded conventional CE methods.
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Affiliation(s)
- Besma Mnassri
- Advanced Technologies for Medicine and Signals Laboratory 'ATMS', National Engineering School of Sfax, Sfax University, Sfax, Tunisia.
| | - Amira Echtioui
- Advanced Technologies for Medicine and Signals Laboratory 'ATMS', National Engineering School of Sfax, Sfax University, Sfax, Tunisia
| | - Fathi Kallel
- Advanced Technologies for Medicine and Signals Laboratory 'ATMS', National Engineering School of Sfax, Sfax University, Sfax, Tunisia
- National School of Electronics and Communications, Sfax University, Sfax, Tunisia
| | - Ahmed Ben Hamida
- Department IS, College of Computer Science, King Khalid University 'KKU', Abha, Saudi Arabia
| | - Mariem Dammak
- Department of Neurology, CHU Habib Bourguiba, Sfax, Tunisia
| | - Chokri Mhiri
- Department of Neurology, CHU Habib Bourguiba, Sfax, Tunisia
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Sule O, Viriri S. Contrast Enhancement of RGB Retinal Fundus Images for Improved Segmentation of Blood Vessels Using Convolutional Neural Networks. J Digit Imaging 2023; 36:414-432. [PMID: 36456839 PMCID: PMC10039198 DOI: 10.1007/s10278-022-00738-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 09/27/2021] [Accepted: 11/03/2021] [Indexed: 12/03/2022] Open
Abstract
Retinal fundus images are non-invasively acquired and faced with low contrast, noise, and uneven illumination. The low-contrast problem makes objects in the retinal fundus image indistinguishable and the segmentation of blood vessels very challenging. Retinal blood vessels are significant because of their diagnostic importance in ophthalmologic diseases. This paper proposes improved retinal fundus images for optimal segmentation of blood vessels using convolutional neural networks (CNNs). This study explores some robust contrast enhancement tools on the RGB and the green channel of the retinal fundus images. The improved images undergo quality evaluation using mean square error (MSE), peak signal to noise ratio (PSNR), Similar Structure Index Matrix (SSIM), histogram, correlation, and intersection distance measures for histogram comparison before segmentation in the CNN-based model. The simulation results analysis reveals that the improved RGB quality outperforms the improved green channel. This revelation implies that the choice of RGB to the green channel for contrast enhancement is adequate and effectively improves the quality of the fundus images. This improved contrast will, in turn, boost the predictive accuracy of the CNN-based model during the segmentation process. The evaluation of the proposed method on the DRIVE dataset achieves an accuracy of 94.47, sensitivity of 70.92, specificity of 98.20, and AUC (ROC) of 97.56.
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Affiliation(s)
- Olubunmi Sule
- School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, Durban, South Africa
| | - Serestina Viriri
- School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, Durban, South Africa.
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Chkili S, Lefebvre Y, Chao SL, Bali MA, Lemort M, Coquelet N. Optimization of workflow for detection of brain metastases at 3T: is a black-blood MTC prepared 3D T1 used alone robust enough to replace the combination of conventional 3D T1 and the black-blood 3D T1 MTC? Neuroradiology 2023:10.1007/s00234-023-03143-8. [PMID: 36995375 DOI: 10.1007/s00234-023-03143-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Accepted: 03/21/2023] [Indexed: 03/31/2023]
Abstract
PURPOSE Sampling perfection with application-optimized contrasts by using different flip angle evolutions (SPACE) is a black-blood 3D T1-weighted (T1w) magnetic resonance imaging (MRI) sequence that has shown robust performance for brain metastases detection. However, this could generate false positive results due to suboptimal blood signal suppression. For that reason, SPACE is used in our institution alongside a non-black-blood T1w sequence: volumetric interpolated breath-hold examination (VIBE). Our study aims to (i) evaluate the diagnostic accuracy of SPACE compared to its use in combination with VIBE, (ii) investigate the effect of radiologist's experience in the sequence's performance, and (iii) analyze causes of discordants results. METHODS Four hundred seventy-three 3T MRI scans were retrospectively analyzed following a monocentric study design. Two studies were formed: one including SPACE alone and one combining both sequences (SPACE + VIBE, the reference). An experienced neuroradiologist and a radiology trainee independently reviewed the images of each study and reported the number of brain metastases. The sensitivity (Se) and specificity (Sp) of SPACE compared to SPACE + VIBE in metastases detection were reported. Diagnostic accuracy of SPACE compared to SPACE + VIBE was assessed by using McNemar's test. Significance was set at p < 0.05. Cohen's kappa was used for inter-method and inter-observer variability. RESULTS No significant difference was found between the two methods, with SPACE having a Se > 93% and a Sp > 87%. No effect of readers' experience was disclosed. CONCLUSION Independently of radiologist's experience, SPACE alone is robust enough to replace SPACE + VIBE for brain metastases detection.
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Affiliation(s)
- Sophia Chkili
- Department of Radiology, Institut Jules Bordet, 90 Rue Meylemeersch, 1070, Brussels, Belgium.
| | - Yolène Lefebvre
- Department of Radiology, Institut Jules Bordet, 90 Rue Meylemeersch, 1070, Brussels, Belgium
| | - Shih-Li Chao
- Department of Radiology, Institut Jules Bordet, 90 Rue Meylemeersch, 1070, Brussels, Belgium
| | - Maria Antonietta Bali
- Department of Radiology, Institut Jules Bordet, 90 Rue Meylemeersch, 1070, Brussels, Belgium
| | - Marc Lemort
- Department of Radiology, Institut Jules Bordet, 90 Rue Meylemeersch, 1070, Brussels, Belgium
| | - Nicolas Coquelet
- Department of Radiology, Institut Jules Bordet, 90 Rue Meylemeersch, 1070, Brussels, Belgium
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Pinnock MA, Hu Y, Bandula S, Barratt DC. Multi-phase synthetic contrast enhancement in interventional computed tomography for guiding renal cryotherapy. Int J Comput Assist Radiol Surg 2023. [PMID: 36790674 DOI: 10.1007/s11548-023-02843-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 01/19/2023] [Indexed: 02/16/2023]
Abstract
PURPOSE Minimally invasive treatments for renal carcinoma offer a low rate of complications and quick recovery. One drawback of the use of computed tomography (CT) for needle guidance is the use of iodinated contrast agents, which require an increased X-ray dose and can potentially cause adverse reactions. The purpose of this work is to generalise the problem of synthetic contrast enhancement to allow the generation of multiple phases on non-contrast CT data from a real-world, clinical dataset without training multiple convolutional neural networks. METHODS A framework for switching between contrast phases by conditioning the network on the phase information is proposed and compared with separately trained networks. We then examine how the degree of supervision affects the generated contrast by evaluating three established architectures: U-Net (fully supervised), Pix2Pix (adversarial with supervision), and CycleGAN (fully adversarial). RESULTS We demonstrate that there is no performance loss when testing the proposed method against separately trained networks. Of the training paradigms investigated, the fully adversarial CycleGAN performs the worst, while the fully supervised U-Net generates more realistic voxel intensities and performed better than Pix2Pix in generating contrast images for use in a downstream segmentation task. Lastly, two models are shown to generalise to intra-procedural data not seen during the training process, also enhancing features such as needles and ice balls relevant to interventional radiological procedures. CONCLUSION The proposed contrast switching framework is a feasible option for generating multiple contrast phases without the overhead of training multiple neural networks, while also being robust towards unseen data and enhancing contrast in features relevant to clinical practice.
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Hou S, Zhou T, Liu Y, Dang P, Lu H, Shi H. Teeth U-Net: A segmentation model of dental panoramic X-ray images for context semantics and contrast enhancement. Comput Biol Med 2023; 152:106296. [PMID: 36462370 DOI: 10.1016/j.compbiomed.2022.106296] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 10/17/2022] [Accepted: 11/06/2022] [Indexed: 11/13/2022]
Abstract
BACKGROUND AND OBJECTIVE It is very significant in orthodontics and restorative dentistry that the teeth are segmented from dental panoramic X-ray images. Nevertheless, there are some problems in panoramic X-ray images of teeth, such as blurred interdental boundaries, low contrast between teeth and alveolar bone. METHODS In this paper, The Teeth U-Net model is proposed in this paper to resolve these problems. This paper makes the following contributions: Firstly, a Squeeze-Excitation Module is utilized in the encoder and the decoder. And proposing a dense skip connection between encoder and decoder to reduce the semantic gap. Secondly, due to the irregular shape of the teeth and the low contrast of the dental panoramic X-ray images. A Multi-scale Aggregation attention Block (MAB) in the bottleneck layer is designed to resolve this problem, which can effectively extract teeth shape features and fuse multi-scale features adaptively. Thirdly, in order to capture dental feature information in a larger field of perception, this paper designs a Dilated Hybrid self-Attentive Block (DHAB) at the bottleneck layer. This module effectively suppresses the task-irrelevant background region information without increasing the network parameters. Finally, the effectiveness of the algorithm is validated using a clinical dental panoramic X-ray image datasets. RESULTS The results of the three comparison experiments are shown that Accuracy, Precision, Recall, Dice, Volumetric Overlap Error and Relative Volume Difference for dental panoramic X-ray teeth segmentation are 98.53%, 95.62%, 94.51%, 94.28%, 88.92% and 95.97% by the proposed model respectively. CONCLUSION The proposed modules complement each other in processing every detail of the dental panoramic X-ray images, which can effectively improve the efficiency of preoperative preparation and postoperative evaluation, and promote the application of dental panoramic X-ray in medical image segmentation. There are more accuracy about Teeth U-Net than others model in dental panoramic X-ray teeth segmentation. That is very important to clinical doctors to cure in orthodontics and restorative dentistry.
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Affiliation(s)
- Senbao Hou
- School of Computer Science and Engineering, North Minzu University, Yinchuan, China
| | - Tao Zhou
- School of Computer Science and Engineering, North Minzu University, Yinchuan, China; Key Laboratory of Image and Graphics Intelligent Processing of State Ethnic Affairs Commission, North Minzu University, Yinchuan, China.
| | - Yuncan Liu
- School of Computer Science and Engineering, North Minzu University, Yinchuan, China
| | - Pei Dang
- School of Computer Science and Engineering, North Minzu University, Yinchuan, China
| | - Huiling Lu
- School of Science, Ningxia Medical University, Yinchuan, China.
| | - Hongbin Shi
- Urinary Surgery, General Hospital of Ningxia Medical University, Yinchuan, China
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21
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Bin Zou, Fuqiang Zeng, Yuling Yang. Using contrast-enhanced ultrasonography to assess the degree of acute testicular torsion: a case series. BMC Med Imaging 2022; 22:220. [PMID: 36528608 DOI: 10.1186/s12880-022-00953-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Accepted: 12/15/2022] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND There are two types of testicular torsion: complete and incomplete. The degree and duration of symptoms of this condition are critical for treatment decision-making, as the consequences for untimely diagnosis and management can be serious. The preoperative assessment of the degree of acute testicular torsion using ultrasonography is particularly important for determining the appropriate intervention. The purpose of this study was to compare the effectiveness of high-frequency versus contrast-enhanced ultrasonography in determining the degree of acute testicular torsion. METHODS Fifteen patients with clinically diagnosed acute testicular torsion underwent both high-frequency and contrast-enhanced ultrasonography. We compared the characteristics of the ultrasonographic images of the testicular parenchyma in both the afflicted and contralateral (healthy) testes to determine the reliability of contrast-enhanced ultrasonography in assessing the degree of acute testicular torsion. RESULTS The high-frequency ultrasound and contrast-enhanced ultrasound diagnosis of 4 complete testicular torsion and 11 incomplete testicular torsion were correct before operation. However, 5 patients with incomplete testicular torsion were misdiagnosed as complete testicular torsion because no blood flow was detected by high frequency ultrasound. Finally, low speed blood flow was detected by contrast-enhanced ultrasound and the diagnosis was corrected. The accuracy of diagnosing incomplete testicular torsion was 100% using contrast-enhanced ultrasonography and 66.7% using high-frequency ultrasonography; the difference between the two methods was statistically significant (χ2 = 2.50, P ≤ 0.05). CONCLUSION Contrast-enhanced ultrasonography can diagnose testicular torsion with high accuracy and can detect low-velocity blood flow and show microcirculatory blood perfusion in the testicular parenchyma. This can avoid misdiagnosing incomplete testicular torsion as complete, thus averting unnecessary orchiectomy.
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22
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Xu Y, Hrybouski S, Paterson DI, Li Z, Lan Y, Luo L, Shen X, Xu L. Comparison of epicardial adipose tissue volume quantification between ECG-gated cardiac and non-ECG-gated chest computed tomography scans. BMC Cardiovasc Disord 2022; 22:545. [PMID: 36513994 PMCID: PMC9746017 DOI: 10.1186/s12872-022-02958-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Accepted: 10/04/2022] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND This study investigated accuracy and consistency of epicardial adipose tissue (EAT) quantification in non-ECG-gated chest computed tomography (CT) scans. METHODS EAT volume was semi-automatically quantified using a standard Hounsfield unit threshold (- 190, - 30) in three independent cohorts: (1) Cohort 1 (N = 49): paired 120 kVp ECG-gated cardiac non-contrast CT (NCCT) and 120 kVp non-ECG-gated chest NCCT; (2) Cohort 2 (N = 34): paired 120 kVp cardiac NCCT and 100 kVp non-ECG-gated chest NCCT; (3) Cohort 3 (N = 32): paired non-ECG-gated chest NCCT and chest contrast-enhanced CT (CECT) datasets (including arterial phase and venous phase). Images were reconstructed with the slice thicknesses of 1.25 mm and 5 mm in the chest CT datasets, and 3 mm in the cardiac NCCT datasets. RESULTS In Cohort 1, the chest NCCT-1.25 mm EAT volume was similar to the cardiac NCCT EAT volume, while chest NCCT-5 mm underestimated the EAT volume by 7.5%. In Cohort 2, 100 kVp chest NCCT-1.25 mm were 13.2% larger than 120 kVp cardiac NCCT EAT volumes. In Cohort 3, the chest arterial CECT and venous CECT dataset underestimated EAT volumes by ~ 28% and ~ 18%, relative to chest NCCT datasets. All chest CT-derived EAT volumes were similarly associated with significant coronary atherosclerosis with cardiac CT counterparts. CONCLUSION The 120 kVp non-ECG-gated chest NCCT-1.25 mm images produced EAT volumes comparable to cardiac NCCT. Chest CT EAT volumes derived from consistent imaging settings are excellent alternatives to the cardiac NCCT to investigate their association with coronary artery disease.
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Affiliation(s)
- Yuancheng Xu
- Department of Urology, The University of Hong Kong-Shenzhen Hospital, Shenzhen, Guangdong, China
| | - Stanislau Hrybouski
- Neuroscience and Mental Health Institute, University of Alberta, Edmonton, Alberta, Canada
| | - D. Ian Paterson
- Department of Cardiology, Mackenzie Health Science Centre, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Zhiyang Li
- Department of General Surgery, the Second Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, China
| | - Yulong Lan
- Department of Cardiology, the Second Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, China
| | - Lin Luo
- Department of Radiology, The University of Hong Kong-Shenzhen Hospital, Shenzhen, Guangdong, China
| | - Xinping Shen
- Department of Radiology, The University of Hong Kong-Shenzhen Hospital, Shenzhen, Guangdong, China
| | - Lingyu Xu
- Department of Cardiology, Mackenzie Health Science Centre, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
- University of Alberta, 2C2, Mackenzie Health Science Centre, 8440 - 112 St, Edmonton, Alberta, T6G 2B7, Canada
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Lortie J, Gage G, Rush B, Heymsfield SB, Szczykutowicz TP, Kuchnia AJ. The effect of computed tomography parameters on sarcopenia and myosteatosis assessment: a scoping review. J Cachexia Sarcopenia Muscle 2022; 13:2807-2819. [PMID: 36065509 PMCID: PMC9745495 DOI: 10.1002/jcsm.13068] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 06/21/2022] [Accepted: 07/20/2022] [Indexed: 12/15/2022] Open
Abstract
Computed tomography (CT) is a valuable assessment method for muscle pathologies such as sarcopenia, cachexia, and myosteatosis. However, several key underappreciated scan imaging parameters need consideration for both research and clinical use, specifically CT kilovoltage and the use of contrast material. We conducted a scoping review to assess these effects on CT muscle measures. We reviewed articles from PubMed, Scopus, and Web of Science from 1970 to 2020 on the effect of intravenous contrast material and variation in CT kilovoltage on muscle mass and density. We identified 971 articles on contrast and 277 articles on kilovoltage. The number of articles that met inclusion criteria for contrast and kilovoltage was 11 and 7, respectively. Ten studies evaluated the effect of contrast on muscle density of which nine found that contrast significantly increases CT muscle density (arterial phase 6-23% increase, venous phase 19-57% increase, and delayed phase 23-43% increase). Seven out of 10 studies evaluating the effect of contrast on muscle area found significant increases in area due to contrast (≤2.58%). Six studies evaluating kilovoltage on muscle density found that lower kilovoltage resulted in a higher muscle density (14-40% increase). One study reported a significant decrease in muscle area when reducing kilovoltage (2.9%). The use of contrast and kilovoltage variations can have dramatic effects on skeletal muscle analysis and should be considered and reported in CT muscle analysis research. These significant factors in CT skeletal muscle analysis can alter clinical and research outcomes and are therefore a barrier to clinical application unless better appreciated.
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Affiliation(s)
- Jevin Lortie
- Department of Nutritional Sciences, University of Wisconsin-Madison, Madison, WI, USA
| | - Grace Gage
- Department of Nutritional Sciences, University of Wisconsin-Madison, Madison, WI, USA
| | - Benjamin Rush
- Department of Nutritional Sciences, University of Wisconsin-Madison, Madison, WI, USA
| | - Steven B Heymsfield
- Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, LA, USA
| | | | - Adam J Kuchnia
- Department of Nutritional Sciences, University of Wisconsin-Madison, Madison, WI, USA
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Cesaria M, Alfinito E, Arima V, Bianco M, Cataldo R. MEED: A novel robust contrast enhancement procedure yielding highly-convergent thresholding of biofilm images. Comput Biol Med 2022; 151:106217. [PMID: 36306585 DOI: 10.1016/j.compbiomed.2022.106217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 10/04/2022] [Accepted: 10/15/2022] [Indexed: 12/27/2022]
Abstract
Morphological and statistical investigation of biofilm images may be even more critical than the image acquisition itself, in particular in the presence of morphologically complex distributions, due to the unavoidable impact of the measurement technique too. Hence, digital image pre-processing is mandatory for reliable feature extraction and enhancement preliminary to segmentation. Also, pattern recognition in automated deep learning (both supervised and unsupervised) models often requires a preliminary effective contrast-enhancement. However, no universal consensus exists on the optimal contrast enhancement approach. This paper presents and discusses a new general, robust, reproducible, accurate and easy to implement contrast enhancement procedure, briefly named MEED-procedure, able to work on images with different bacterial coverages and biofilm structures, coming from different imaging instrumentations (herein stereomicroscope and transmission microscope). It exploits a proper succession of basic morphological operations (erosion and dilation) and a horizontal line structuring element, to minimize the impact on size and shape of the even finer bacterial features. It systematically enhances the objects of interest, without histogram stretching and/or undesirable artifacts yielded by common automated methods. The quality of the MEED-procedure is ascertained by segmentation tests which demonstrate its robustness regarding the determination of threshold and convergence of the thresholding algorithm. Extensive validation tests over a rich image database, comparison with the literature and comprehensive discussion of the conceptual background support the superiority of the MEED-procedure over the existing methods and demonstrate it is not a routine application of morphological operators.
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Affiliation(s)
- Maura Cesaria
- University of Salento-Department of Mathematics and Physics "Ennio De Giorgi"- c/o Campus Ecotekne - Lecce, Italy.
| | - Eleonora Alfinito
- University of Salento-Department of Mathematics and Physics "Ennio De Giorgi"- c/o Campus Ecotekne - Lecce, Italy
| | - Valentina Arima
- CNR NANOTEC - Institute of Nanotechnology, c/o Campus Ecotekne, Lecce, Italy
| | - Monica Bianco
- CNR NANOTEC - Institute of Nanotechnology, c/o Campus Ecotekne, Lecce, Italy
| | - Rosella Cataldo
- University of Salento-Department of Mathematics and Physics "Ennio De Giorgi"- c/o Campus Ecotekne - Lecce, Italy.
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Iglesias-Garcia J, Lariño-Noia J, de la Iglesia-García D, Dominguez-Muñoz JE. Endoscopic ultrasonography: Enhancing diagnostic accuracy. Best Pract Res Clin Gastroenterol 2022; 60-61:101808. [PMID: 36577529 DOI: 10.1016/j.bpg.2022.101808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Accepted: 11/10/2022] [Indexed: 11/21/2022]
Abstract
Endoscopic ultrasound (EUS) is an essential technique for the management of several diseases. Over the years, new technologies have been developed because to improve and overcome certain limitations related to EUS guided tissue acquisition. Among these new methods, EUS guided elastography and contrast enhanced EUS has arisen as the most widely recognized and available. We will review in this manuscript the different techniques of elastography and contrast enhancement. Nowadays, there are well establish indications for advance imaging, mainly for supporting the management of pancreatic diseases (diagnosis of chronic pancreatitis and differential diagnosis of solid and cystic pancreatic tumors) and characterization of lymph nodes. However, there are more data on new potential indications for the near future.
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Massager N, Renier C. MRI Changes in Failed Radiosurgery for Vestibular Schwannomas. Stereotact Funct Neurosurg 2022; 100:282-290. [PMID: 36366815 DOI: 10.1159/000526967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 08/29/2022] [Indexed: 11/12/2022]
Abstract
INTRODUCTION Radiosurgery is now a recognized treatment of vestibular schwannoma (VS); however, radiosurgical irradiation sometimes fails to stop tumor growth in the long term. Some changes in MR imaging after radiosurgery that are supposed to be related to permanent tumor control may be observed in patients with failed treatment. The objective of the present study was to evaluate the MRI changes observed early after radiosurgery in a cohort of patients with failed radiosurgery for VS. METHODS From a large series of VS treated radiosurgically for 15 years, we reviewed the follow-up MRI data in a subgroup of VS that presented obvious treatment failure. T1-weighted MR imaging with standard timing of gadolinium injection was applied for image acquisition during the radiosurgical procedure and all follow-up MR imaging. Evolution of tumor volume and contrast enhancement were assessed on 3D-co-registered MRI. RESULTS Twenty-nine of 728 patients (4%) were retreated for the same VS after >2 years (median 3.14 years, range 2.04-9.47) following initial radiosurgical treatment. The median tumor volume was 0.94 cc at first radiosurgical treatment and 2.19 cc at retreatment. Fourteen patients (48.3%) had continuous increase in tumor volume. For 10 patients (34.5%), the tumor volume reduced significantly after irradiation before it increased again. Four patients (13.8%) showed a transient increase in tumor volume after irradiation, followed by significant volume reduction, then a very significant tumor regrowth. A significant loss of contrast enhancement at the center of the tumor was observed for 25 patients (86.2%); full recovery of contrast enhancement of the tumor was observed for 23 patients. DISCUSSION/CONCLUSION Tumor volume reduction and central loss of contrast enhancement of the tumor are MRI changes frequently observed during follow-up of VS treated radiosurgically even in patients with failed long-term tumor control and may therefore not be considered as signs of successful response of the tumor to the radiosurgical treatment.
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Affiliation(s)
- Nicolas Massager
- Department of Neurological Surgery, CHU de Charleroi - Site Hôpital Civil Marie Curie, Lodelinsart, Charleroi, Belgium.,Department of Radiation Therapy, CHU de Charleroi - site hôpital Vésale, Montignies-Le-Tilleul, Belgium.,Department of Neurological Surgery, CHU Tivoli ULB, La Louvière, Belgium.,Faculty of Medicine, Université Libre de Bruxelles, Bruxelles, Belgium
| | - Cecile Renier
- Department of Radiophysics, CHU UCL Namur - site hôpital Sainte-Elisabeth, Namur, Belgium
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Patel HD, Huai K, Elliott N, Thorson DL, Rac G, Picken MM, Quek ML, Bova D, Gupta GN. Differentiating Oncocytic Renal Tumors from Chromophobe Renal Cell Carcinoma: Comparison of Peak Early-phase Enhancement Ratio to Clinical Risk Factors and Rater Predictions. EUR UROL SUPPL 2022; 46:8-14. [PMID: 36506255 DOI: 10.1016/j.euros.2022.10.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/05/2022] [Indexed: 11/23/2022] Open
Abstract
Background Most surgically resected benign renal tumors are found to be oncocytomas or indolent hybrid oncocytic tumors, which are difficult to differentiate from chromophobe renal cell carcinoma (chRCC) on renal mass biopsy. Both often exhibit CD117+ staining. Objective To evaluate the ability of the peak early-phase enhancement ratio (PEER) to distinguish oncocytomas from chRCC and compare its discrimination to traditional clinical risk factors and blinded clinical raters. Design setting and participants This was a diagnostic case-control study of patients (2006-2020) with oncocytoma or chRCC according to surgical pathology. Intervention Partial or radical nephrectomy. Outcome measurements and statistical analysis Three clinical raters blinded to histology measured the PEER and the presence of stellate scar and predicted the final histology for each tumor. Averaged and individual PEER values were compared to surgical pathology and assessed for interobserver variability. Subanalyses were conducted for patients with confirmed CD117+ status. Results and limitations For the 76 patients identified, PEER was higher among the 32 (42.1%) oncocytomas than among the 44 (57.9%) chRCCs (median 0.81 vs 0.43; p < 0.001), with high correlation across raters (correlation coefficients ≥0.85). A PEER cutoff of <0.60 was strongly associated with identification of chRCC (OR 95.7 (95% CI 19.9-460.8), p < 0.001). In the overall and CD117+ cohorts, sensitivity was 93.2% and 97.0%, the negative predictive value was 90.3% and 95.5%, and the area under the receiver operating characteristic curve (AUC) on multivariable modeling was 95.0% and 98.1%, respectively. PEER outperformed models with clinical risk factors alone (AUC 70.4%) and histology predictions by three raters (AUC 51.6%, 62.5%, and 63.1%). Limitations include reliance on surgical pathology and inclusion of a mix of early contrast-enhanced phases. Conclusions PEER reliably differentiated benign renal oncocytomas and indolent hybrid tumors from malignant chRCC with excellent diagnostic performance. A diagnostic pathway with biopsy, CD117 staining, and PEER deserves further study to potentially avoid unnecessary surgery for oncocytic renal tumors. Patient summary We assessed a measurement called PEER on computed tomography (CT) scans and found higher values for benign and lower values for malignant kidney masses, so we were able to tell these apart. PEER was reliable for identifying tumors with positive staining for the CD117 protein biomarker as well as in the overall patient group. Our results show that PEER could be considered for use with biopsy and CD117 staining to potentially avoid unnecessary surgery for benign kidney masses.
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Pandey AK, Dogra S, Sharma PD, Jaleel J, Patel C, Kumar R. Contrast Enhancement of Scintigraphic Image Using Fuzzy Intensification. Indian J Nucl Med 2022; 37:209-216. [PMID: 36686290 PMCID: PMC9855253 DOI: 10.4103/ijnm.ijnm_210_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 03/04/2022] [Accepted: 03/16/2022] [Indexed: 11/07/2022] Open
Abstract
Introduction The objective of this study was to see the effect of fuzzy intensification (INT) operator on enhancement of scintigraphic image. Materials and Methods Nuclear medicine physician (NMP) provided 25 scintigraphic images that required enhancement. The image pixels value was converted into fuzzy plane and was subjected to contrast INT operator with parameters of INT operator i.e., cross-over = 0.5 and number of iterations = 1 and 2. The enhanced image was again brought back into spatial domain (de-fuzzification) whose intensity value was in the range 0-255. NMP compared the enhanced image with its input image and labeled it as acceptable or unacceptable. The quality of enhanced image was also accessed objectively using four different image metrics namely: Entropy, edge content, absolute mean brightness error and saturation metrics. Results Most of the enhanced images (18 out of 25 images) obtained at cross-over = 0.5 and number of iterations = 1 are acceptable and found to have overall better contrast compared to the corresponding input image. Four images (two brain positron emission tomography scan and two I-131 scan) obtained at cross-over = 0.5 and with iteration = 2 are acceptable. Three input images (one dimercaptosuccinic acid (DMSA), one I-131 and one I-131- metaiodo-benzyl-guanidine (MIBG) scan) were better than their enhanced images. Conclusions The enhancement produced by fuzzy INT operator was encouraging. Majority of enhanced images were acceptable at cross-over = 0.5 and number iterations = 1.
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Affiliation(s)
- Anil Kumar Pandey
- Department of Nuclear Medicine, All India Institute of Medical Sciences, New Delhi, India
| | - Sakshi Dogra
- Department of Nuclear Medicine, All India Institute of Medical Sciences, New Delhi, India
| | - Param Dev Sharma
- Department of Computer Science, SGTB Khalsa College, University of Delhi, New Delhi, India
| | - Jasim Jaleel
- Department of Nuclear Medicine, All India Institute of Medical Sciences, New Delhi, India
| | - Chetan Patel
- Department of Nuclear Medicine, All India Institute of Medical Sciences, New Delhi, India
| | - Rakesh Kumar
- Department of Nuclear Medicine, All India Institute of Medical Sciences, New Delhi, India
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Lopes RR, van den Boogert TPW, Lobe NHJ, Verwest TA, Henriques JPS, Marquering HA, Planken RN. Machine learning-based prediction of insufficient contrast enhancement in coronary computed tomography angiography. Eur Radiol 2022; 32:7136-7145. [PMID: 35708840 PMCID: PMC9474338 DOI: 10.1007/s00330-022-08901-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 04/29/2022] [Accepted: 05/19/2022] [Indexed: 11/04/2022]
Abstract
OBJECTIVES Patient-tailored contrast delivery protocols strongly reduce the total iodine load and in general improve image quality in CT coronary angiography (CTCA). We aim to use machine learning to predict cases with insufficient contrast enhancement and to identify parameters with the highest predictive value. METHODS Machine learning models were developed using data from 1,447 CTs. We included patient features, imaging settings, and test bolus features. The models were trained to predict CTCA images with a mean attenuation value in the ascending aorta below 400 HU. The accuracy was assessed by the area under the receiver operating characteristic (AUROC) and precision-recall curves (AUPRC). Shapley Additive exPlanations was used to assess the impact of features on the prediction of insufficient contrast enhancement. RESULTS A total of 399 out of 1,447 scans revealed attenuation values in the ascending aorta below 400 HU. The best model trained using only patient features and CT settings achieved an AUROC of 0.78 (95% CI: 0.73-0.83) and AUPRC of 0.65 (95% CI: 0.58-0.71). With the inclusion of the test bolus features, it achieved an AUROC of 0.84 (95% CI: 0.81-0.87), an AUPRC of 0.71 (95% CI: 0.66-0.76), and a sensitivity of 0.66 and specificity of 0.88. The test bolus' peak height was the feature that impacted low attenuation prediction most. CONCLUSION Prediction of insufficient contrast enhancement in CT coronary angiography scans can be achieved using machine learning models. Our experiments suggest that test bolus features are strongly predictive of low attenuation values and can be used to further improve patient-specific contrast delivery protocols. KEY POINTS • Prediction of insufficient contrast enhancement in CT coronary angiography scans can be achieved using machine learning models. • The peak height of the test bolus curve is the most impacting feature for the best performing model.
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Affiliation(s)
- R R Lopes
- Department of Biomedical Engineering and Physics, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands.,Department of Radiology and Nuclear Medicine, Amsterdam UMC, University of Amsterdam, 1105, AZ, Amsterdam, The Netherlands
| | - T P W van den Boogert
- Department of Clinical and Experimental Cardiology, Amsterdam UMC, University of Amsterdam, Amsterdam Cardiovascular Sciences, Amsterdam, The Netherlands
| | - N H J Lobe
- Department of Radiology and Nuclear Medicine, Amsterdam UMC, University of Amsterdam, 1105, AZ, Amsterdam, The Netherlands
| | | | - J P S Henriques
- Department of Clinical and Experimental Cardiology, Amsterdam UMC, University of Amsterdam, Amsterdam Cardiovascular Sciences, Amsterdam, The Netherlands
| | - H A Marquering
- Department of Biomedical Engineering and Physics, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands.,Department of Radiology and Nuclear Medicine, Amsterdam UMC, University of Amsterdam, 1105, AZ, Amsterdam, The Netherlands
| | - R N Planken
- Department of Radiology and Nuclear Medicine, Amsterdam UMC, University of Amsterdam, 1105, AZ, Amsterdam, The Netherlands.
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Sparchez Z, Mocan T, Craciun R, Sparchez M, Nolsøe C. Contrast enhancement for ultrasound-guided interventions: when to use it and what to expect? Ultrasonography 2022; 41:263-278. [PMID: 35073625 PMCID: PMC8942733 DOI: 10.14366/usg.21207] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 12/09/2021] [Indexed: 02/01/2023] Open
Abstract
The use of contrast-enhanced ultrasonography (CEUS) has recently become synonymous with high-standard ultrasonography (US). From expanding the reach of US diagnostics to improving the precision of various invasive procedures, CEUS is rapidly becoming a standard in numerous niches. However, proficiency in CEUS comes with a cost, both from a learning curve and material standpoint, and as every growing field, lacks firm evidence and standardization. Therefore, in the current paper, we aim to provide an evidence-based review of available methods and to discuss the advantages and pitfalls of CEUS in interventional procedures, trying to provide strong evidence whenever available, or at least an educated expert opinion if data are lacking.
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Affiliation(s)
- Zeno Sparchez
- 3rd Medical Department, "Iuliu Hațieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania.,"Prof. Dr. O. Fodor" Regional Institute of Gastroenterology and Hepatology, Cluj-Napoca, Romania
| | - Tudor Mocan
- "Prof. Dr. O. Fodor" Regional Institute of Gastroenterology and Hepatology, Cluj-Napoca, Romania
| | - Rares Craciun
- 3rd Medical Department, "Iuliu Hațieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania.,"Prof. Dr. O. Fodor" Regional Institute of Gastroenterology and Hepatology, Cluj-Napoca, Romania
| | - Mihaela Sparchez
- Department of Pediatrics, "Iuliu Hațieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Christian Nolsøe
- Center for Surgical Ultrasound, Department of Surgery, Zealand University Hospital, Køge, Denmark.,Copenhagen Academy for Medical Education and Simulation (CAMES), University of Copenhagen and the Capital Region of Denmark, Copenhagen E, Denmark
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Moon HH, Park JE, Kim YH, Kim JH, Kim HS. Contrast enhancing pattern on pre-treatment MRI predicts response to anti-angiogenic treatment in recurrent glioblastoma: comparison of bevacizumab and temozolomide treatment. J Neurooncol 2022; 157:405-415. [PMID: 35275335 DOI: 10.1007/s11060-022-03980-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Accepted: 03/04/2022] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To evaluate the value of the contrast enhancing pattern on pre-treatment MRI for predicting the response to anti-angiogenic treatment in patients with IDH-wild type recurrent glioblastoma. METHODS This retrospective study enrolled 65 patients with IDH wild-type recurrent glioblastoma who received standard therapy and then received either bevacizumab (46 patients) or temozolomide (19 patients) as a secondary treatment. The contrast enhancing pattern on pre-treatment MRI was visually analyzed and dichotomized into contrast enhancing lesion (CEL) dominant and non-enhancing lesion (NEL) dominant types. Quantitative volumetric analysis was used to support the dichotomization. The Kaplan-Meier method and Cox proportional hazards regression analysis were used to stratify progression free survival (PFS) according to the treatment in the entire patients, CEL dominant group, and NEL dominant group. RESULTS In all patients, the PFS of those treated with bevacizumab was not significantly different from those treated with temozolomide (log-rank test, P = 0.96). When the contrast enhancing pattern was considered, bevacizumab was associated with longer PFS in the CEL dominant group (P = 0.031), whereas temozolomide showed longer PFS in the NEL dominant group (P = 0.022). Quantitative analysis revealed mean values for the proportion of solid-enhancing tumor of 13.7% for the CEL dominant group and 4.3% for the NEL dominant group. CONCLUSION Patients with the CEL dominant type showed a better treatment response to bevacizumab, whereas NEL dominant types showed a better response to temozolomide. The contrast enhancing pattern on pre-treatment MRI can be used to stratify patients with IDH wild-type recurrent glioblastoma according to the effect of anti-angiogenic treatment.
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Affiliation(s)
- Hye Hyeon Moon
- Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, 43 Olympic-ro 88, Songpa-Gu, Seoul, 05505, South Korea
| | - Ji Eun Park
- Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, 43 Olympic-ro 88, Songpa-Gu, Seoul, 05505, South Korea.
| | - Young-Hoon Kim
- Department of Neurosurgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, 05505, South Korea
| | - Jeong Hoon Kim
- Department of Neurosurgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, 05505, South Korea
| | - Ho Sung Kim
- Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, 43 Olympic-ro 88, Songpa-Gu, Seoul, 05505, South Korea
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Masuda T, Funama Y, Nakaura T, Sato T, Tahara M, Masuda S, Yoshiura T, Gotanda R, Arao K, Imaizumi H, Arao S, Hiratsuka J, Awai K. Effect of injection duration on contrast enhancement during cardiac computed tomography angiography in newborns and infants. Radiography (Lond) 2021; 28:440-446. [PMID: 34844859 DOI: 10.1016/j.radi.2021.11.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 11/08/2021] [Accepted: 11/10/2021] [Indexed: 10/19/2022]
Abstract
INTRODUCTION To investigate how changing the injection duration at cardiac computed tomography angiography (CCTA) affects contrast enhancement in newborns and infants. METHODS Included were 142 newborns and infants with confirmed congenital heart disease who underwent CCTA between January 2015 and December 2018. In group 1 (n = 71 patients), the injection duration was 8 s; in group 2 (n = 71) it was 16 s. Our findings were assessed by one-to-one matching analysis to estimate the propensity score of each patient. We compare the CT number for the pulmonary artery (PA), ascending aorta (AAO), left superior vena cava (SVC), AAO and PA enhancement ratio, and the scores for visualization between the two groups. RESULTS In group 1, median CT number and ranges was 345 (211-591) HU in the AAO, 324 (213-567) HU in the PA, and 62 (1-70) HU in the SVC. These values were 465 (308-669) HU, 467 (295-638) HU, and 234 (67-443) HU, respectively, in group 2 (p < 0.05). The median score for volume-rendering visualization on 3D images of the CCTA was 2 in group 1 and 3 in group 2; the score for visualization of the left SVC of the maximum intensity projection images was 2 in group 1 and 3 in group 2 (p < 0.05). The CT number for the AAO and PA enhancement ratio was 15.2 in group 1 and 9.2 in group 2 (p < 0.05). CONCLUSION The 16-sec injection protocol yielded significantly higher CT numbers for the AAO, PA, and the SVC than the 8-sec injection protocol; the visualization scores were also significantly higher in group 2. IMPLICATIONS FOR PRACTICE In newborns and infants, the longer injection time for CCTA yields stable and higher contrast enhancement at identical CM concentrations.
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Affiliation(s)
- T Masuda
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki, Okayama, 701-0193, Japan.
| | - Y Funama
- Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo, Kumamoto, 860-8556, Japan
| | - T Nakaura
- Department of Medical Physics, Faculty of Life Sciences, Kumamoto University, Kumamoto, 1-1-1 Honjo, Kumamoto, 860-8556, Japan
| | - T Sato
- Department of Diagnostic Radiology, Tsuchiya General Hospital, Nakajima-cho 3-30, Naka-ku, Hiroshima, 730-8655, Japan
| | - M Tahara
- Department of Pediatric Cardiology, Tsuchiya General Hospital, Nakajima-cho 3-30, Naka-ku, Hiroshima, 730-8655, Japan
| | - S Masuda
- Department of Radiological Technology, Kawamura Clinic, Otemachi, Naka-ku, Hiroshima, 730-0051, Japan
| | - T Yoshiura
- Department of Radiological Technology, Tsuchiya General Hospital, Nakajima-cho 3-30, Naka-ku, Hiroshima, 730-8655, Japan
| | - R Gotanda
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki, Okayama, 701-0193, Japan
| | - K Arao
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki, Okayama, 701-0193, Japan
| | - H Imaizumi
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki, Okayama, 701-0193, Japan
| | - S Arao
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki, Okayama, 701-0193, Japan
| | - J Hiratsuka
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki, Okayama, 701-0193, Japan
| | - K Awai
- Department of Diagnostic Radiology, Graduate School of Biomedical Sciences, Hiroshima University, Kasumi 1-2-3 Minami-ku, Hiroshima, 734-8551, Japan
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Masuda T, Funama Y, Nakaura T, Sato T, Tahara M, Yamashita Y, Yoshiura T, Masuda S, Gotanda R, Arao K, Imaizumi H, Arao S, Hiratsuka J, Awai K. Efficacy of the spiral flow generating extended tube during paediatric CCTA. Radiography (Lond) 2021; 28:420-425. [PMID: 34702665 DOI: 10.1016/j.radi.2021.10.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 09/30/2021] [Accepted: 10/09/2021] [Indexed: 11/19/2022]
Abstract
INTRODUCTION To compare the computed tomography (CT) number for paediatric cardiac computed tomography angiography (CCTA) and visualisation score of the three-dimensional (3D) images using the conventional T-shaped extended tube (T-tube) and spiral flow-generating extended tube (spiral-tube) connected between the contrast injector and cannula. METHODS In total, 108 patients suspected to have congenital heart disease (CHD) were considered for inclusion. We utilised the T-tube for intravenous contrast and spiral-tube in 54 patients each. Observers individually inspected randomized volume rendering images of the internal thoracic artery, each acquired from the with or without spiral-tube groups, using a four-point scale. We compared the mean CT number of the ascending aorta (AAO) and pulmonary artery (PA), contrast noise ratio (CNR), CT number for the AAO and PA enhancement ratio, and the visualisation scores between the groups. RESULTS There were no significant differences in patient characteristics between the with or without spiral-tube groups (p > 0.05). The mean CT number ±standard deviation for the AAO and PA, and the CNR without or with spiral-tube groups were 441.2 ± 89.2 and 489.8 ± 86.1 HU for the AAO, 436.3 ± 100.6 and 475.3 ± 85.2 HU for the PA, and 9.5 ± 2.2 and 10.8 ± 2.4 for the CNR, respectively (p < 0.05). In the spiral-tube group, the CT number, CNR, and visualisations score of the 3D images were significantly higher for the AAO and PA than those in the T-tube group (p < 0.05). CONCLUSION The spiral-tube proved to be beneficial in improving the CT number for the AAO and PA, CNR, and visualisation score compared with the conventional T-tube during paediatric CCTA. IMPLICATIONS FOR PRACTICE The spiral-tube may allow the visualisation of smaller blood vessels than those visualised by the conventional T-tube for paediatric patients in CCTA.
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Affiliation(s)
- T Masuda
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki, Okayama, 701-0193, Japan.
| | - Y Funama
- Department of Medical Physics, Faculty of Life Sciences, Kumamoto University, Kumamoto, 1-1-1 Honjo, Kumamoto, 860-8556, Japan
| | - T Nakaura
- Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo, Kumamoto, 860-8556, Japan
| | - T Sato
- Department of Diagnostic Radiology, Tsuchiya General Hospital, Nakajima-cho 3-30, Naka-ku, Hiroshima, 730-8655, Japan
| | - M Tahara
- Department of Pediatric Cardiology, Tsuchiya General Hospital, Nakajima-cho 3-30, Naka-ku, Hiroshima, 730-8655, Japan
| | - Y Yamashita
- Department of Radiological Technology, Tsuchiya General Hospital, Nakajima-cho 3-30, Naka-ku, Hiroshima, 730-8655, Japan
| | - T Yoshiura
- Department of Radiological Technology, Tsuchiya General Hospital, Nakajima-cho 3-30, Naka-ku, Hiroshima, 730-8655, Japan
| | - S Masuda
- Department of Radiological Technology, Kawamura Clinic, Otemachi, Naka-ku, Hiroshima, 730-0051, Japan
| | - R Gotanda
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki, Okayama, 701-0193, Japan
| | - K Arao
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki, Okayama, 701-0193, Japan
| | - H Imaizumi
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki, Okayama, 701-0193, Japan
| | - S Arao
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki, Okayama, 701-0193, Japan
| | - J Hiratsuka
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki, Okayama, 701-0193, Japan
| | - K Awai
- Department of Diagnostic Radiology, Graduate School of Biomedical Sciences, Hiroshima University, Kasumi 1-2-3 Minami-ku, Hiroshima, 734-8551, Japan
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Taresh MM, Zhu N, Ali TAA, Alghaili M, Hameed AS, Mutar ML. KL-MOB: automated COVID-19 recognition using a novel approach based on image enhancement and a modified MobileNet CNN. PeerJ Comput Sci 2021; 7:e694. [PMID: 34616885 PMCID: PMC8459788 DOI: 10.7717/peerj-cs.694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Accepted: 08/05/2021] [Indexed: 06/13/2023]
Abstract
The emergence of the novel coronavirus pneumonia (COVID-19) pandemic at the end of 2019 led to worldwide chaos. However, the world breathed a sigh of relief when a few countries announced the development of a vaccine and gradually began to distribute it. Nevertheless, the emergence of another wave of this pandemic returned us to the starting point. At present, early detection of infected people is the paramount concern of both specialists and health researchers. This paper proposes a method to detect infected patients through chest x-ray images by using the large dataset available online for COVID-19 (COVIDx), which consists of 2128 X-ray images of COVID-19 cases, 8,066 normal cases, and 5,575 cases of pneumonia. A hybrid algorithm is applied to improve image quality before undertaking neural network training. This algorithm combines two different noise-reduction filters in the image, followed by a contrast enhancement algorithm. To detect COVID-19, we propose a novel convolution neural network (CNN) architecture called KL-MOB (COVID-19 detection network based on the MobileNet structure). The performance of KL-MOB is boosted by adding the Kullback-Leibler (KL) divergence loss function when trained from scratch. The KL divergence loss function is adopted for content-based image retrieval and fine-grained classification to improve the quality of image representation. The results are impressive: the overall benchmark accuracy, sensitivity, specificity, and precision are 98.7%, 98.32%, 98.82% and 98.37%, respectively. These promising results should help other researchers develop innovative methods to aid specialists. The tremendous potential of the method proposed herein can also be used to detect COVID-19 quickly and safely in patients throughout the world.
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Affiliation(s)
| | - Ningbo Zhu
- College of Information Science and Engineering, Hunan University, Changsha, Hunan, China
| | - Talal Ahmed Ali Ali
- College of Information Science and Engineering, Hunan University, Changsha, Hunan, China
| | - Mohammed Alghaili
- College of Information Science and Engineering, Hunan University, Changsha, Hunan, China
| | - Asaad Shakir Hameed
- Department of Mathematics, General Directorate of Thi-Qar Education, Ministry of Education, Thi-Qar, Iraq
| | - Modhi Lafta Mutar
- Department of Mathematics, General Directorate of Thi-Qar Education, Ministry of Education, Thi-Qar, Iraq
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So YH, Lee W, Park EA, Kim PK. Investigation of the Characteristics of New, Uniform, Extremely Small Iron-Based Nanoparticles as T1 Contrast Agents for MRI. Korean J Radiol 2021; 22:1708-1718. [PMID: 34402245 PMCID: PMC8484154 DOI: 10.3348/kjr.2020.1455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Revised: 04/06/2021] [Accepted: 05/10/2021] [Indexed: 11/21/2022] Open
Abstract
Objective The purpose of this study was to evaluate the magnetic resonance (MR) characteristics and applicability of new, uniform, extremely small iron-based nanoparticles (ESIONs) with 3–4-nm iron cores using contrast-enhanced magnetic resonance angiography (MRA). Materials and Methods Seven types of ESIONs were used in phantom and animal experiments with 1.5T, 3T, and 4.7T scanners. The MR characteristics of the ESIONs were evaluated via phantom experiments. With the ESIONs selected by the phantom experiments, animal experiments were performed on eight rabbits. In the animal experiments, the in vivo kinetics and enhancement effect of the ESIONs were evaluated using half-diluted and non-diluted ESIONs. The between-group differences were assessed using a linear mixed model. A commercially available gadolinium-based contrast agent (GBCA) was used as a control. Results All ESIONs showed a good T1 shortening effect and were applicable for MRA at 1.5T and 3T. The relaxivity ratio of the ESIONs increased with increasing magnetic field strength. In the animal experiments, the ESIONs showed peak signal intensity on the first-pass images and persistent vascular enhancement until 90 minutes. On the 1-week follow-up images, the ESIONs were nearly washed out from the vascular structures and organs. The peak signal intensity on the first-pass images showed no significant difference between the non-diluted ESIONs with 3-mm iron cores and GBCA (p = 1.000). On the 10-minutes post-contrast images, the non-diluted ESIONs showed a significantly higher signal intensity than did the GBCA (p < 0.001). Conclusion In the phantom experiments, the ESIONs with 3–4-nm iron oxide cores showed a good T1 shortening effect at 1.5T and 3T. In the animal experiments, the ESIONs with 3-nm iron cores showed comparable enhancement on the first-pass images and superior enhancement effect on the delayed images compared to the commercially available GBCA at 3T.
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Affiliation(s)
- Young Ho So
- Department of Radiology, SMG-SNU Boramae Medical Center, Seoul, Korea.,Department of Radiology, Seoul National University College of Medicine, Seoul, Korea
| | - Whal Lee
- Department of Radiology, Seoul National University College of Medicine, Seoul, Korea.,Department of Radiology, Seoul National University Hospital, Seoul, Korea.,Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Korea.
| | - Eun Ah Park
- Department of Radiology, Seoul National University College of Medicine, Seoul, Korea.,Department of Radiology, Seoul National University Hospital, Seoul, Korea
| | - Pan Ki Kim
- Department of Radiology and Research Institute of Radiological Science, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
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Liu N, Chen X, Kimm MA, Stechele M, Chen X, Zhang Z, Wildgruber M, Ma X. In vivo optical molecular imaging of inflammation and immunity. J Mol Med (Berl) 2021; 99:1385-1398. [PMID: 34272967 DOI: 10.1007/s00109-021-02115-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2021] [Revised: 06/04/2021] [Accepted: 07/07/2021] [Indexed: 12/20/2022]
Abstract
Inflammation is the phenotypic form of various diseases. Recent development in molecular imaging provides new insights into the diagnostic and therapeutic evaluation of different inflammatory diseases as well as diseases involving inflammation such as cancer. While conventional imaging techniques used in the clinical setting provide only indirect measures of inflammation such as increased perfusion and altered endothelial permeability, optical imaging is able to report molecular information on diseased tissue and cells. Optical imaging is a quick, noninvasive, nonionizing, and easy-to-use diagnostic technology which has been successfully applied for preclinical research. Further development of optical imaging technology such as optoacoustic imaging overcomes the limitations of mere fluorescence imaging, thereby enabling pilot clinical applications in humans. By means of endogenous and exogenous contrast agents, sites of inflammation can be accurately visualized in vivo. This allows for early disease detection and specific disease characterization, enabling more rapid and targeted therapeutic interventions. In this review, we summarize currently available optical imaging techniques used to detect inflammation, including optical coherence tomography (OCT), bioluminescence, fluorescence, optoacoustics, and Raman spectroscopy. We discuss advantages and disadvantages of the different in vivo imaging applications with a special focus on targeting inflammation including immune cell tracking.
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Affiliation(s)
- Nian Liu
- State Key Laboratory of Natural Medicines, Key Laboratory of Drug Quality Control and Pharmacovigilance, Department of Pharmaceutical Analysis, China Pharmaceutical University, Nanjing, 210009, China
- Department of Chemistry, Technical University of Munich, 85747, Garching, Germany
| | - Xiao Chen
- Klinik und Poliklinik IV, University Hospital, LMU Munich, 80336, Munich, Germany
| | - Melanie A Kimm
- Department of Radiology, University Hospital, LMU Munich, 81337, Munich, Germany
| | - Matthias Stechele
- Department of Radiology, University Hospital, LMU Munich, 81337, Munich, Germany
| | - Xueli Chen
- School of Life Science and Technology, Xidian University, Xi'an 710126, China
| | - Zhimin Zhang
- School of Control Science and Engineering, Shandong University, Jinan, 250061, China
| | - Moritz Wildgruber
- Department of Radiology, University Hospital, LMU Munich, 81337, Munich, Germany
| | - Xiaopeng Ma
- School of Control Science and Engineering, Shandong University, Jinan, 250061, China.
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Barrios López A, García Martínez F, Rodríguez JI, Montero-San-Martín B, Gómez Rioja R, Diez J, Martín-Hervás C. Incidence of contrast-induced nephropathy after a computed tomography scan. Radiologia (Engl Ed) 2021; 63:307-313. [PMID: 34246421 DOI: 10.1016/j.rxeng.2020.02.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2019] [Accepted: 02/13/2020] [Indexed: 11/15/2022]
Abstract
BACKGROUND AND AIMS The term contrast-induced nephropathy is used to describe acute deterioration of renal function after the intravenous administration of iodinated contrast material. We aimed to estimate the incidence of contrast-induced nephropathy and to analyze the evolution of different biomarkers of renal function in patients who underwent computed tomography with intravenous contrast administration after premedication with oral hydration and N-acetylcysteine. MATERIAL AND METHODS This prospective observational study included 112 patients with chronic renal failure (glomerular filtration rate (GFR) 30ml-60ml/min/1.73m2) scheduled for computed tomography with intravenous iodinated contrast material. We recorded demographic variables, dose of contrast material, diabetes mellitus, hypertension, and serum hemoglobin. We measured serum creatinine and GFR after premedication and after the CT examination. We summarized variables as means, standard deviations, and percentages. We used the Wilcoxon and Mann-Whitney tests to compare pre- and post-CT values and Pearson's r to analyze correlations. RESULTS Incidence acute kidney injury: 0.9%; 95%CI: 0.36-1.4. Mean difference between pre- and post-CT creatinine: 0.04; 95%CI: 0.002-0.09, p<0.004. Mean difference between pre- and post-CT GFR: -3.06; 95%CI: -4.66 to -1.47), p<0.001. CONCLUSIONS The incidence of contrast-induced nephropathy in patients with chronic renal failure and GFR 30ml-60ml/min/1.73m2 is low. The biomarkers of renal function analyzed improve in patients who receive premedication and the minimum dose of contrast material.
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Affiliation(s)
- A Barrios López
- Servicio de Radiodiagnóstico, Hospital Universitario La Paz, Madrid, Spain.
| | - F García Martínez
- Servicio de Radiodiagnóstico, Hospital Universitario La Paz, Madrid, Spain
| | - J I Rodríguez
- Servicio de Radiodiagnóstico, Hospital Universitario La Paz, Madrid, Spain
| | | | - R Gómez Rioja
- Servicio de Análisis Clínicos, Hospital Universitario La Paz, Madrid, Spain
| | - J Diez
- Servicio de Bioestadística, IdiPAZ - Hospital Universitario La Paz, Madrid, Spain
| | - C Martín-Hervás
- Servicio de Radiodiagnóstico, Hospital Universitario La Paz, Madrid, Spain
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Moon HH, Kim HS, Park JE, Kim YH, Kim JH. Refinement of response assessment in neuro-oncology (RANO) using non-enhancing lesion type and contrast enhancement evolution pattern in IDH wild-type glioblastomas. BMC Cancer 2021; 21:654. [PMID: 34074252 PMCID: PMC8170938 DOI: 10.1186/s12885-021-08414-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 05/24/2021] [Indexed: 11/24/2022] Open
Abstract
Background Updated response assessment in neuro-oncology (RANO) does not consider peritumoral non-enhancing lesion (NEL) and baseline (residual) contrast enhancement (CE) volume. The objective of this study is to explore helpful imaging characteristics to refine RANO for assessing early treatment response (pseudoprogression and time-to-progression [TTP]) in patients with IDH wild-type glioblastoma. Methods This retrospective study enrolled 86 patients with IDH wild-type glioblastoma who underwent consecutive MRI examinations before and after concurrent chemoradiotherapy (CCRT). NEL was classified as edema- or tumor-dominant type on pre-CCRT MRI. CE evolution was categorized into 4 patterns based on post-operative residual CE (measurable vs. non-measurable) and CE volume change (same criteria with RANO) during CCRT. Multivariable logistic regression, including clinical parameters, NEL type, and CE evolution pattern, was used to analyze pseudoprogression rate. TTP and OS according to NEL type and CE evolution pattern was analyzed by the Kaplan–Meier method. Results Pseudoprogression rate was significantly lower (chi-square test, P = .047) and TTP was significantly shorter (hazard ratio [HR] = 2.03, P = .005) for tumor-dominant type than edema-dominant type of NEL. NEL type was the only predictive marker of pseudoprogression on multivariate analysis (odds ratio = 0.26, P = .046). Among CE evolution patterns, TTP and OS was shortest in patients with residual CE compared with those exhibiting new CE (HR = 4.33, P < 0.001 and HR = 3.71, P = .009, respectively). In edema-dominant NEL type, both TTP and OS was stratified by CE evolution pattern (log-rank, P = .001), whereas it was not in tumor-dominant NEL. Conclusions NEL type improves prediction of pseudoprogression and, together with CE evolution pattern, further stratifies TTP and OS in patients with IDH wild-type glioblastoma and may become a helpful biomarker for refining RANO. Supplementary Information The online version contains supplementary material available at 10.1186/s12885-021-08414-2.
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Affiliation(s)
- Hye Hyeon Moon
- Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 43 Olympic-ro 88, 86 Asanbyeongwon-Gil, Songpa-Gu, Seoul, 05505, Republic of Korea
| | - Ho Sung Kim
- Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 43 Olympic-ro 88, 86 Asanbyeongwon-Gil, Songpa-Gu, Seoul, 05505, Republic of Korea.
| | - Ji Eun Park
- Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 43 Olympic-ro 88, 86 Asanbyeongwon-Gil, Songpa-Gu, Seoul, 05505, Republic of Korea
| | - Young-Hoon Kim
- Department of Neurosurgery, University of Ulsan College of Medicine, Asan Medical Center, 86 Asanbyeongwon-Gil, Songpa-Gu, Seoul, 05505, Republic of Korea
| | - Jeong Hoon Kim
- Department of Neurosurgery, University of Ulsan College of Medicine, Asan Medical Center, 86 Asanbyeongwon-Gil, Songpa-Gu, Seoul, 05505, Republic of Korea
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Takatsu Y, Nakamura M, Yamashiro T, Ikemoto A, Sawa S, Nakamura M, Miyati T. Evaluation of contrast and denoising effects related to imaging parameters of compressed sensitivity encoding in contrast-enhanced magnetic resonance imaging. Radiol Phys Technol 2021; 14:193-202. [PMID: 33797728 DOI: 10.1007/s12194-021-00617-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 03/12/2021] [Accepted: 03/14/2021] [Indexed: 10/21/2022]
Abstract
To acquire reference data for setting an appropriate compressed sensitivity encoding (CS) for brain lesion detectability, the effects of contrast and noise on contrast-enhanced magnetic resonance imaging (MRI) were evaluated. Gadobutrol at various concentrations and manganese chloride tetrahydrate were used as a phantom. Various CS factors (0-10) and denoising levels (weak, medium, and strong) were assessed. The contrast amount decreased from CS7 in non-denoised images for 0.5-2 mmol/L solutions but slightly decreased from CS7 with denoising. The noise amount significantly increased with an increasing CS factor. Generally, there was a significant difference in the denoising level and rate across all CS factors in the case of the 2 and 0 mmol/L solutions. When the CS factor was increased without denoising, the integrated noise power spectrum (NPS) increased and decreased in the high-frequency and low-frequency areas, respectively. These data can be used to establish settings based on the degree of denoising.
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Breitling B, Schmeel FC, Radbruch A, Kaut O. Sudden paraparesis due to spinal cord ischemia with initial contrast enhancement of the cauda equina and time-delayed owl-eyes sign on follow-up MR imaging: a case report. Neurol Res Pract 2021; 3:13. [PMID: 33789775 PMCID: PMC8015166 DOI: 10.1186/s42466-021-00112-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Accepted: 02/24/2021] [Indexed: 11/30/2022] Open
Abstract
We report on a case of a 52-year-old male with sudden paraparesis. The initial MRI showed contrast enhancement of the conus medullaris and the complete cauda equina. Follow-up MRI revealed a spinal ischemia in the anterior portion of the spinal cord. Only a few reports with similar findings have been published. We suggest that contrast enhancement of the conus medullaris and descending nerve roots can be a potential first indicator of a spinal cord ischemia.
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Affiliation(s)
- Benedict Breitling
- Department of Neurology, University Clinic Bonn, Venusberg Campus 1, 53105, Bonn, Germany
| | | | | | - Oliver Kaut
- Department of Neurology, University Clinic Bonn, Venusberg Campus 1, 53105, Bonn, Germany.
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Thomas A, Sunija AP, Manoj R, Ramachandran R, Ramachandran S, Varun PG, Palanisamy P. RPE layer detection and baseline estimation using statistical methods and randomization for classification of AMD from retinal OCT. Comput Methods Programs Biomed 2021; 200:105822. [PMID: 33190943 DOI: 10.1016/j.cmpb.2020.105822] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Accepted: 10/27/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND AND OBJECTIVE Age-related macular degeneration (AMD) is a condition of the eye that affects the aged people. Optical coherence tomography (OCT) is a diagnostic tool capable of analyzing and identifying the disease affected retinal layers with high resolution. The objective of this work is to extract the retinal pigment epithelium (RPE) layer and the baseline (natural eye curvature, particular to every patient) from retinal spectral-domain OCT (SD-OCT) images. It uses them to find the height of drusen (abnormalities) in the RPE layer and classify it as AMD or normal. METHODS In the proposed work, the contrast enhancement based adaptive denoising technique is used for speckle elimination. Pixel grouping and iterative elimination based on the knowledge of typical layer intensities and positions are used to obtain the RPE layer. Using this estimate, randomization techniques are employed, followed by polynomial fitting and drusen removal to arrive at a baseline estimate. The classification is based on the drusen height obtained by taking the difference between the RPE and baseline levels. We have used a patient, wise classification approach where a patient is classified diseased if more than a threshold number of patient images have drusen of more than a certain height. Since all slices of an affected patient will not show drusen, we are justified in adopting this technique. RESULTS The proposed method is tested on a public data set of 2130 images/slices, which belonged to 30 patient volumes (15 AMD and 15 Normal) and achieved an overall accuracy of 96.66%, with no false positives. In comparison with existing works, the proposed method achieved higher overall accuracy and a better baseline estimate. CONCLUSIONS The proposed work focuses on AMD/normal classification using a statistical approach. It does not require any training. The proposed method modifies the motion restoration paradigm to obtain an application-specific denoising algorithm. The existing RPE detection algorithm is modified significantly to make it robust and applicable even to images where the RPE is not very evident/there is a significant amount of perforations (drusen). The baseline estimation algorithm employs a powerful combination of randomization, iterative polynomial fitting, and pixel elimination in contrast to mere fitting techniques. The main highlight of this work is, it achieved an exact estimation of the baseline in the retinal image compared to the existing methods.
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Affiliation(s)
- Anju Thomas
- Department of Electronics and Communication Engineering, National Institute of Technology Tiruchirappalli, Tamilnadu 620015, India.
| | - A P Sunija
- Department of Electronics and Communication Engineering, National Institute of Technology Tiruchirappalli, Tamilnadu 620015, India.
| | - Rigved Manoj
- Department of Electronics and Communication Engineering, National Institute of Technology Tiruchirappalli, Tamilnadu 620015, India.
| | - Rajiv Ramachandran
- Department of Electronics and Communication Engineering, National Institute of Technology Tiruchirappalli, Tamilnadu 620015, India.
| | - Srikkanth Ramachandran
- Department of Electronics and Communication Engineering, National Institute of Technology Tiruchirappalli, Tamilnadu 620015, India.
| | - P Gopi Varun
- Department of Electronics and Communication Engineering, National Institute of Technology Tiruchirappalli, Tamilnadu 620015, India.
| | - P Palanisamy
- Department of Electronics and Communication Engineering, National Institute of Technology Tiruchirappalli, Tamilnadu 620015, India.
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Elkilany A, Geisel D, Müller T, Fischer A, Denecke T. Gadoxetic acid-enhanced MRI in primary sclerosing cholangitis: added value in assessing liver function and monitoring disease progression. Abdom Radiol (NY) 2021; 46:979-991. [PMID: 32918576 PMCID: PMC8257540 DOI: 10.1007/s00261-020-02731-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 08/20/2020] [Accepted: 08/30/2020] [Indexed: 11/12/2022]
Abstract
PURPOSE To investigate the added value of gadoxetic acid-enhanced MRI in monitoring liver function and disease progression in patients with primary sclerosing cholangitis (PSC). METHODS We retrospectively identified 104 consecutive patients (75 males; mean age 41.98 ± 12.5 years) with confirmed diagnosis of PSC who underwent 227 gadoxetic acid-enhanced MRI examinations between January 2008 and May 2019. Relative enhancement (RE) of the liver was correlated with the results of liver function tests (LFTs), scoring models (Model for End-Stage Liver Disease (MELD) score, Mayo Risk Score (MRS), Amsterdam-Oxford model (AOM)), and qualitative MRI findings. In addition, results were analyzed separately for excretory MRI examinations (n = 164) and nonexcretory examinations (n = 63) depending on excretion of gadoxetic acid into the common bile duct in the hepatobiliary phase (HBP). RESULTS There was a significant correlation of RE with MRS (r = - 0.652), MELD score (r = - 0.474), AOM (r = - 0.468), and LFTs (P < 0.001). RE and albumin were significantly higher in the excretory group whereas scoring models, bilirubin, aspartate aminotransferase, alkaline phosphatase, and international normalized ratio were lower (P < 0.001). RE was lower in segments with absent HBP gadoxetic acid excretion into dilated bile ducts, reduced HBP parenchymal enhancement, atrophy, T2 hyperintensity, and bile duct abnormalities (P < 0.001). CONCLUSION Relative enhancement of the liver in gadoxetic acid-enhanced MRI can be used to evaluate global and regional liver function and monitor disease progression in patients with PSC. Hepatobiliary phase gadoxetic acid biliary excretion appears to be a reproducible qualitative parameter for evaluating disease severity that can be easily integrated into routine clinical practice.
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Affiliation(s)
- Aboelyazid Elkilany
- Department of Diagnostic and Interventional Radiology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Augustenburger Platz 1, 13353, Berlin, Germany.
| | - Dominik Geisel
- Department of Diagnostic and Interventional Radiology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Augustenburger Platz 1, 13353, Berlin, Germany
| | - Tobias Müller
- Division of Gastroenterology and Hepatology, Department of Medicine, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Augustenburger Platz 1, 13353, Berlin, Germany
| | - Andreas Fischer
- Division of Gastroenterology and Hepatology, Department of Medicine, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Augustenburger Platz 1, 13353, Berlin, Germany
| | - Timm Denecke
- Department of Diagnostic and Interventional Radiology, Universitätsklinikum Leipzig, Leipzig, Germany
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Terasawa K, Tanaka K, Watanabe N, Takada M, Ikeno Y. Optimization of computed tomography contrast studies with a new, simple dosing regimen incorporating body size: examination of contrast effects in the thoracoabdominal aorta. Radiol Phys Technol 2021; 14:149-160. [PMID: 33624235 DOI: 10.1007/s12194-021-00609-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 02/11/2021] [Accepted: 02/12/2021] [Indexed: 11/30/2022]
Abstract
The dosage of contrast agents for computed tomography contrast studies is calculated based on the parameter of actual body weight (ABW) to ensure reproducibility. The use of lean body weight (LBW) and adjustment for physique (lean or obese) improves accuracy. However, this method is complex, because LBW is not a general body parameter and requires a special device to measure. To solve this problem, contrast body weight (CBW), has been proposed as a new and simple parameter that considers physique. CBW is calculated by determining the blood volume ratio based on body height, ABW, and sex and can potentially correct for body size. It can be calculated by entering a formula in a Microsoft Excel sheet. Since CBW can be easily obtained using this general tool, we decided to compare the two body parameters of ABW and CBW. We compared ABW and CBW and demonstrated a higher correlation between CBW-based dosing and the amount of iodine used per body weight than with ABW-based dosing. CBW-based dosing allows correction for body size. This indicates that contrast enhancement over a spectrum of lean or obese examinees can be linearly evaluated. To date, this method has shown good results.
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Affiliation(s)
- Kazuaki Terasawa
- Department of Radiology, Japanese Red Cross Saitama Hospital, 1-5Chuo-ku, ShintoshinSaitama, Saitama, 330-8553, Japan.
| | - Koki Tanaka
- Department of Radiology, Japanese Red Cross Saitama Hospital, 1-5Chuo-ku, ShintoshinSaitama, Saitama, 330-8553, Japan
| | - Nobuki Watanabe
- Department of Radiology, Japanese Red Cross Saitama Hospital, 1-5Chuo-ku, ShintoshinSaitama, Saitama, 330-8553, Japan
| | - Miki Takada
- Department of Radiology, Japanese Red Cross Saitama Hospital, 1-5Chuo-ku, ShintoshinSaitama, Saitama, 330-8553, Japan
| | - Yuta Ikeno
- Department of Radiology, Japanese Red Cross Saitama Hospital, 1-5Chuo-ku, ShintoshinSaitama, Saitama, 330-8553, Japan
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Goo HW. Radiation dose, contrast enhancement, image noise and heart rate variability of ECG-gated CT volumetry using 3D threshold-based segmentation: Comparison between conventional single scan and dual focused scan methods. Eur J Radiol 2021; 137:109606. [PMID: 33621856 DOI: 10.1016/j.ejrad.2021.109606] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 02/10/2021] [Accepted: 02/13/2021] [Indexed: 10/22/2022]
Abstract
OBJECTIVE To compare radiation dose, contrast enhancement, image noise and heart rate variability in electrocardiography (ECG)-gated computed tomography (CT) ventricular volumetry using a three-dimensional (3D) threshold-based segmentation between the conventional single scan and dual focused scan methods in patients with congenital heart disease. METHODS After matching for age, sex, heart rate during the CT examination, and tube voltage, 96 patients (age range, 7 - 36 years; male:female = 63:33) who underwent ECG-gated CT volumetry using a 3D threshold-based segmentation, were divided into 32 patients who underwent a conventional single scan (group 1) and 64 who underwent dual focused scans (group 2). CT radiation dose, contrast enhancement, image noise, and heart rate variability were compared between the two groups. RESULTS Volume CT dose index, dose-length product, and effective dose estimates, in group 1 were significantly higher than those in group 2 (28.4 ± 24.6 mGy vs. 9.7 ± 4.5 mGy, 636.5 ± 572.9 mGy cm vs. 379.5 ± 192.4 mGy cm, 8.9 ± 8.0 mSv vs. 5.3 ± 2.7 mSv, 8.2 ± 6.4 mSv vs. 5.0 ± 2.2 mSv, respectively; p values < 0.019). No significant differences in right and left ventricular contrast enhancement were found between the two groups (470.2 ± 152.4 HU vs. 481.0 ± 139.2 HU and 428.6 ± 97.8 HU vs. 429.3 ± 106.7 HU, respectively; p values > 0.05). Image noise measured in the air showed no significant differences between groups 1 and 2 (5.6 ± 1.9 HU vs. 5.5 ± 1.1 HU; p > 0.05). The proportion of heart rate variability ≥ 20 beats per minute in group 1 (15.6 %, 5/32) was significantly higher than that in group 2 (3.1 %, 2/64; p < 0.040). CONCLUSION Compared with the conventional single scan method, the dual focused scan method can provide a lower radiation dose with comparable contrast enhancement and image noise for ECG-gated CT ventricular volumetry using a 3D threshold-based segmentation in patients with congenital heart disease.
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Affiliation(s)
- Hyun Woo Goo
- Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Republic of Korea.
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Yap LPP, Wong JHD, Muhammad Gowdh NF, Ng WL, Chung E, Eturajulu RC, Foo SAMK, Vijayananthan A, Sani FM. Customised weight-based volume contrast media protocol in CT of chest, abdomen and pelvis examination. J Med Imaging Radiat Sci 2021; 52:257-264. [PMID: 33531272 DOI: 10.1016/j.jmir.2021.01.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2020] [Revised: 12/18/2020] [Accepted: 01/14/2021] [Indexed: 12/30/2022]
Abstract
INTRODUCTION Fixed volume (FV) contrast media administration during CT examination is the standard practice in most healthcare institutions. We aim to validate a customised weight-based volume (WBV) method and compare it to the conventional FV methods, introduced in a regional setting. METHODS 220 patients underwent CT of the chest, abdomen and pelvis (CAP) using a standard FV protocol, and subsequently, a customised 1.0 mL/kg WBV protocol within one year. Both image sets were assessed for contrast enhancement using CT attenuation at selected regions-of-interest (ROIs). The visual image quality was evaluated by three radiologists using a 4-point Likert scale. Quantitative CT attenuation was correlated with the visual quality assessment to determine the HU's enhancement indicative of the image quality grades. Contrast media usage was calculated to estimate cost-savings from both protocols. RESULTS Mean patient age was 61 ± 14 years, and weight was 56.1 ± 8.7 kg. FV protocol produced higher contrast enhancement than WBV, p < 0.001. CT images' overall contrast enhancement was negatively correlated with body weight for FV protocol while the WBV protocol produced more consistent enhancement across different body weight. More than 90% of the images from both protocols were graded "Excellent". WBV protocol also enabled a 28% cost reduction with cost savings of US$1238. CONCLUSION The customised WBV protocol produced CT images which were comparable to FV protocol for CT CAP examinations. A median CT value of 100 HU can be an indicator of good image quality for the WBV protocol.
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Affiliation(s)
- Lilian Poh Poh Yap
- Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia; Department of Biomedical Imaging, University of Malaya Medical Centre, Lembah Pantai, 59100 Kuala Lumpur, Malaysia; Research Unit of Biomedical Imaging, University of Malaya Medical Centre, Lembah Pantai, 59100 Kuala Lumpur, Malaysia
| | - Jeannie Hsiu Ding Wong
- Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia.
| | - Nadia Fareeda Muhammad Gowdh
- Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia; Department of Biomedical Imaging, University of Malaya Medical Centre, Lembah Pantai, 59100 Kuala Lumpur, Malaysia
| | - Wei Lin Ng
- Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia; Department of Biomedical Imaging, University of Malaya Medical Centre, Lembah Pantai, 59100 Kuala Lumpur, Malaysia
| | - Eric Chung
- Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia; Department of Biomedical Imaging, University of Malaya Medical Centre, Lembah Pantai, 59100 Kuala Lumpur, Malaysia
| | - Ravi Chanthriga Eturajulu
- Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia; Department of Biomedical Imaging, University of Malaya Medical Centre, Lembah Pantai, 59100 Kuala Lumpur, Malaysia; Research Unit of Biomedical Imaging, University of Malaya Medical Centre, Lembah Pantai, 59100 Kuala Lumpur, Malaysia
| | - Sue Anne Manushya Kaur Foo
- Department of Biomedical Imaging, University of Malaya Medical Centre, Lembah Pantai, 59100 Kuala Lumpur, Malaysia; Research Unit of Biomedical Imaging, University of Malaya Medical Centre, Lembah Pantai, 59100 Kuala Lumpur, Malaysia
| | - Anushya Vijayananthan
- Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia; Department of Biomedical Imaging, University of Malaya Medical Centre, Lembah Pantai, 59100 Kuala Lumpur, Malaysia
| | - Fadhli Mohamed Sani
- Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia; Department of Biomedical Imaging, University of Malaya Medical Centre, Lembah Pantai, 59100 Kuala Lumpur, Malaysia
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Scoppettuolo P, Dalaqua M, Ghika JA, Bonvin C. Multimodal imaging for a TIPIC syndrome case. Acta Neurol Belg 2021; 122:1069-1071. [PMID: 33486716 DOI: 10.1007/s13760-020-01585-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Accepted: 12/18/2020] [Indexed: 11/28/2022]
Affiliation(s)
| | - Mariana Dalaqua
- Department of Radiology, Centre Hospitalier Valais Romand, Sion, Switzerland
| | - Joseph-André Ghika
- Department of Neurology, Centre Hospitalier Valais Romand, Sion, Switzerland
| | - Christophe Bonvin
- Department of Neurology, Centre Hospitalier Valais Romand, Sion, Switzerland
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Nagaraja TN, deCarvalho AC, Brown SL, Griffith B, Farmer K, Irtenkauf S, Hasselbach L, Mukherjee A, Bartlett S, Valadie OG, Cabral G, Knight RA, Lee IY, Divine GW, Ewing JR. The impact of initial tumor microenvironment on imaging phenotype. Cancer Treat Res Commun 2021; 27:100315. [PMID: 33571801 PMCID: PMC8127413 DOI: 10.1016/j.ctarc.2021.100315] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 01/13/2021] [Accepted: 01/14/2021] [Indexed: 11/13/2022]
Abstract
Models of human cancer, to be useful, must replicate human disease with high fidelity. Our focus in this study is rat xenograft brain tumors as a model of human embedded cerebral tumors. A distinguishing signature of such tumors in humans, that of contrast-enhancement on imaging, is often not present when the human cells grow in rodents, despite the xenografts having nearly identical DNA signatures to the original tumor specimen. Although contrast enhancement was uniformly evident in all the human tumors from which the xenografts’ cells were derived, we show that long-term contrast enhancement in the model tumors may be determined conditionally by the tumor microenvironment at the time of cell implantation. We demonstrate this phenomenon in one of two patient-derived orthotopic xenograft (PDOX) models using cancer stem-like cell (CSC)-enriched neurospheres from human tumor resection specimens, transplanted to groups of immune-compromised rats in the presence or absence of a collagen/fibrin scaffolding matrix, Matrigel. The rats were imaged by dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) and their brains were examined by histopathology. Targeted proteomics of the PDOX tumor specimens grown from CSC implanted with and without Matrigel showed that while the levels of the majority of proteins and post-translational modifications were comparable between contrast-enhancing and non-enhancing tumors, phosphorylation of Fox038 showed a differential expression. The results suggest key proteins determine contrast enhancement and suggest a path toward the development of better animal models of human glioma. Future work is needed to elucidate fully the molecular determinants of contrast-enhancement.
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Affiliation(s)
| | | | - Stephen L Brown
- Department of Radiation Oncology, Henry Ford Hospital, Detroit, MI, United States; Department of Public Health, Henry Ford Hospital, Detroit, MI, United States
| | - Brent Griffith
- Department of Radiology, Henry Ford Hospital, Detroit, MI, United States
| | - Katelynn Farmer
- Department of Biomedical Engineering, Wayne State University, Detroit, MI, United States
| | - Susan Irtenkauf
- Department of Neurosurgery, Henry Ford Hospital, Detroit, MI
| | | | - Abir Mukherjee
- Department of Pathology, Henry Ford Hospital, Detroit, MI, United States
| | - Seamus Bartlett
- Department of Neurosurgery, Henry Ford Hospital, Detroit, MI; School of Medicine, Wayne State University, Detroit, MI, United States
| | - O Grahm Valadie
- Department of Radiation Oncology, Wayne State University, Detroit, MI, United States
| | - Glauber Cabral
- Department of Neurology, Henry Ford Hospital, Detroit, MI, United States
| | - Robert A Knight
- Department of Neurology, Henry Ford Hospital, Detroit, MI, United States; Department of Physics, Oakland University, Rochester, MI, United States
| | - Ian Y Lee
- Department of Neurosurgery, Henry Ford Hospital, Detroit, MI
| | - George W Divine
- Department of Public Health, Henry Ford Hospital, Detroit, MI, United States
| | - James R Ewing
- Department of Neurosurgery, Henry Ford Hospital, Detroit, MI; Department of Neurology, Henry Ford Hospital, Detroit, MI, United States; Department of Physics, Oakland University, Rochester, MI, United States; Department of Neurology, Wayne State University, Detroit, MI, United States
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Iwano S, Kamiya S, Ito R, Nakamura S, Naganawa S. Iodine-related attenuation in contrast-enhanced dual-energy computed tomography in small-sized solid-type lung cancers is associated with the postoperative prognosis. Cancer Imaging 2021; 21:7. [PMID: 33413669 PMCID: PMC7791656 DOI: 10.1186/s40644-020-00368-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Accepted: 12/11/2020] [Indexed: 01/07/2023] Open
Abstract
Background To investigate the correlation between iodine-related attenuation in contrast-enhanced dual-energy computed tomography (DE-CT) and the postoperative prognosis of surgically resected solid-type small-sized lung cancers. Methods We retrospectively reviewed the DE-CT findings and postoperative course of solid-type lung cancers ≤3 cm in diameter. After injection of iodinated contrast media, arterial phases were scanned using 140-kVp and 80-kVp tube voltages. Three-dimensional iodine-related attenuation (3D-IRA) of primary tumors at the arterial phase was computed using the “lung nodule” application software. The corrected 3D-IRA normalized to the patient’s body weight and contrast medium concentration was then calculated. Results A total of 120 resected solid-type lung cancers ≤3 cm in diameter were selected for analysis (82 males and 38 females; mean age, 67 years). During the observation period (median, 47 months), 32 patients showed postoperative recurrence. Recurrent tumors had significantly lower 3D-IRA and corrected 3D-IRA at early phase compared to non-recurrent tumors (p = 0.046 and p = 0.027, respectively). The area under the receiver operating characteristic curve for postoperative recurrence was 0.624 for the corrected 3D-IRA at early phase (p = 0.025), and the cutoff value was 5.88. Kaplan–Meier curves for disease-free survival indicated that patients showing tumors with 3D-IRA > 5.88 had a significantly better prognosis than those with tumors showing 3D-IRA < 5.88 (p = 0.017). Conclusions The 3D-IRA of small-sized solid-type lung cancers on contrast-enhanced DE-CT was significantly associated with postoperative prognosis, and low 3D-IRA tumors showed a higher TNM stage and a significantly poorer prognosis.
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Affiliation(s)
- Shingo Iwano
- Department of Radiology, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan.
| | - Shinichiro Kamiya
- Department of Radiology, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan
| | - Rintaro Ito
- Department of Radiology, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan
| | - Shota Nakamura
- Department of Thoracic Surgery, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan
| | - Shinji Naganawa
- Department of Radiology, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan
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Shamekhi S, Periyasamy V, Pramanik M, Mehrmohammadi M, Mohammadzadeh Asl B. Eigenspace-based minimum variance beamformer combined with sign coherence factor: Application to linear-array photoacoustic imaging. Ultrasonics 2020; 108:106174. [PMID: 32502893 DOI: 10.1016/j.ultras.2020.106174] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2019] [Revised: 04/16/2020] [Accepted: 05/12/2020] [Indexed: 06/11/2023]
Abstract
Photoacoustic (PA) imaging combining the advantages of high resolution of ultrasound imaging and high contrast of optical imaging provides images with good quality. PA imaging often suffers from disadvantages such as clutter noises and decreased signal-to-noise-ratio at higher depths. One studied method to reduce clutter noises is to use weighting factors such as coherence factor (CF) and its modified versions that improve resolution and contrast of images. In this study, we combined the Eigen-space based minimum variance (EIBMV) beamformer with the sign coherence factor (SCF) and show the ability of these methods for noise reduction when they are used in combination with each other. In addition, we compared the proposed method with delay-and-sum (DAS) and minimum variance (MV) beamformers in simulated and experimental studies. The simulation results show that the proposed EIBMV-SCF method improves the SNR about 94 dB, 87.65 dB, and 62.29 dB compared to the DAS, MV, and EIBMV, respectively, and the corresponding improvements were 79.37/34.43 dB, 77.25/26.96 dB, and 33.19/25.56 dB in the ex vivo/in vivo experiments.
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Affiliation(s)
- Sadaf Shamekhi
- Department of Biomedical Engineering, Tarbiat Modares University, Tehran, Iran
| | - Vijitha Periyasamy
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore
| | - Manojit Pramanik
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore
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Wang J, Li YJ, Yang KF. Retinal fundus image enhancement with image decomposition and visual adaptation. Comput Biol Med 2020; 128:104116. [PMID: 33249342 DOI: 10.1016/j.compbiomed.2020.104116] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 11/05/2020] [Accepted: 11/09/2020] [Indexed: 02/08/2023]
Abstract
Retinal fundus photography has been widely used to diagnose various prevalent diseases because many important diseases manifest themselves on the retina. However, the quality of fundus images obtained from practical clinical environments is not always good enough for diagnosis due to uneven illumination, blurring, low contrast, etc. In this paper, we propose a simple yet efficient method for fundus image enhancement. We first conduct image decomposition to divide the input image into three layers: base, detail, and noise layers; and then illumination correction, detail enhancement and denoising are conducted respectively at these three layers. Specifically, a simple visual adaptation model is used to correct the uneven illumination at the base layer and a weighted fusion is employed to enhance details and suppress noise and artifacts. The proposed method was evaluated on public datasets (DIARETDB0 and DIARETDB1), and also on some challenging images collected by us from the hospital. In addition, quality assessments by ophthalmologists were implemented to further verify the contribution of the proposed method in helping make diagnosis. Experimental results show that the proposed method outperforms other related methods and can simultaneously handle the tasks of illumination correction, detail enhancement and noise (and artifact) suppression.
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Affiliation(s)
- Jianglan Wang
- Department of Optometry and Vision Science, West China Hospital, Sichuan University, Chengdu, 610041, China.
| | - Yong-Jie Li
- MOE Key Lab for Neuroinformation, University of Electronic Science and Technology of China, Chengdu, 610054, China.
| | - Kai-Fu Yang
- MOE Key Lab for Neuroinformation, University of Electronic Science and Technology of China, Chengdu, 610054, China.
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