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Mun NE, Tran TKC, Park DH, Im JH, Park JI, Le TD, Moon YJ, Kwon SY, Yoo SW. Endoscopic Hyperspectral Imaging System to Discriminate Tissue Characteristics in Tissue Phantom and Orthotopic Mouse Pancreatic Tumor Model. Bioengineering (Basel) 2024; 11:208. [PMID: 38534482 DOI: 10.3390/bioengineering11030208] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Revised: 02/15/2024] [Accepted: 02/21/2024] [Indexed: 03/28/2024] Open
Abstract
In this study, we developed an endoscopic hyperspectral imaging (eHSI) system and evaluated its performance in analyzing tissues within tissue phantoms and orthotopic mouse pancreatic tumor models. Our custom-built eHSI system incorporated a liquid crystal tunable filter. To assess its tissue discrimination capabilities, we acquired images of tissue phantoms, distinguishing between fat and muscle regions. The system underwent supervised training using labeled samples, and this classification model was then applied to other tissue phantom images for evaluation. In the tissue phantom experiment, the eHSI effectively differentiated muscle from fat and background tissues. The precision scores regarding fat tissue classification were 98.3% for the support vector machine, 97.7% for the neural network, and 96.0% with a light gradient-boosting machine algorithm, respectively. Furthermore, we applied the eHSI system to identify tumors within an orthotopic mouse pancreatic tumor model. The F-score of each pancreatic tumor-bearing model reached 73.1% for the KPC tumor model and 63.1% for the Pan02 tumor models. The refined imaging conditions and optimization of the fine-tuning of classification algorithms enhance the versatility and diagnostic efficacy of eHSI in biomedical applications.
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Affiliation(s)
- Na Eun Mun
- Department of Nuclear Medicine, Chonnam National University Medical School and Hwasun Hospital, Hwasun-gun 58128, Republic of Korea
- Institute for Molecular Imaging and Theranostics, Chonnam National University Medical School, Hwasun-gun 58128, Republic of Korea
| | - Thi Kim Chi Tran
- Institute for Molecular Imaging and Theranostics, Chonnam National University Medical School, Hwasun-gun 58128, Republic of Korea
- Biomedical Science Graduate Program, Chonnam National University, Hwasun-gun 58128, Republic of Korea
| | - Dong Hui Park
- Department of Nuclear Medicine, Chonnam National University Medical School and Hwasun Hospital, Hwasun-gun 58128, Republic of Korea
- Institute for Molecular Imaging and Theranostics, Chonnam National University Medical School, Hwasun-gun 58128, Republic of Korea
| | - Jin Hee Im
- Department of Nuclear Medicine, Chonnam National University Medical School and Hwasun Hospital, Hwasun-gun 58128, Republic of Korea
- Institute for Molecular Imaging and Theranostics, Chonnam National University Medical School, Hwasun-gun 58128, Republic of Korea
| | - Jae Il Park
- Department of Nuclear Medicine, Chonnam National University Medical School and Hwasun Hospital, Hwasun-gun 58128, Republic of Korea
- Institute for Molecular Imaging and Theranostics, Chonnam National University Medical School, Hwasun-gun 58128, Republic of Korea
| | - Thanh Dat Le
- Institute for Molecular Imaging and Theranostics, Chonnam National University Medical School, Hwasun-gun 58128, Republic of Korea
- Department of Artificial Intelligence Convergence, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Young Jin Moon
- Department of Nuclear Medicine, Chonnam National University Medical School and Hwasun Hospital, Hwasun-gun 58128, Republic of Korea
- Institute for Molecular Imaging and Theranostics, Chonnam National University Medical School, Hwasun-gun 58128, Republic of Korea
| | - Seong-Young Kwon
- Department of Nuclear Medicine, Chonnam National University Medical School and Hwasun Hospital, Hwasun-gun 58128, Republic of Korea
- Institute for Molecular Imaging and Theranostics, Chonnam National University Medical School, Hwasun-gun 58128, Republic of Korea
| | - Su Woong Yoo
- Department of Nuclear Medicine, Chonnam National University Medical School and Hwasun Hospital, Hwasun-gun 58128, Republic of Korea
- Institute for Molecular Imaging and Theranostics, Chonnam National University Medical School, Hwasun-gun 58128, Republic of Korea
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Du M, Zhang J, Wang T, Fang J, Su H, Xiao Z, Peng Y, Liang X, Gong X, Chen Z. Imaging biomarker for quantitative analysis of endometrial injury based on optical coherence tomography/ultrasound integrated imaging mode. J Biophotonics 2023; 16:e202300113. [PMID: 37483072 DOI: 10.1002/jbio.202300113] [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] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 07/11/2023] [Accepted: 07/19/2023] [Indexed: 07/25/2023]
Abstract
Precise evaluation of endometrial injury is significant to clinical decision-making in gynecological disease and assisted reproductive technology. However, there is a lack of assessment methods for endometrium in vivo. In this research, we intend to develop quantitative imaging markers with optical coherence tomography (OCT)/ultrasound (US) integrated imaging system through intrauterine endoscopic imaging. OCT/US integrated imaging system was established as our previous research reported. The endometrial injury model was established and after treatment, OCT/US integrated imaging and uterus biopsy was performed to evaluate the endometrial thickness, number of superficial fold, and intrauterine area. According to the results, three quantitative indexes acquired from OCT/US image and HE staining have the same trend and have a strong relationship with the severity of the endometrial injury. Accordingly, we developed three imaging markers for quantitative analysis of endometrial injury in vivo, which provided a precise mode for endometrium evaluation in clinical practice.
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Affiliation(s)
- Meng Du
- The First Affiliated Hospital, Medical Imaging Centre, Hengyang Medical School, University of South China, Hengyang, Hunan, China
- Institute of Medical Imaging, Hengyang Medical School, University of South China, Hengyang, China
| | - Jinke Zhang
- The Research Center for Biomedical Optics and Molecular Imaging, Shenzhen Key Laboratory for Molecular Imaging, Guangdong Provincial Key Laboratory of Biomedical Optical Imaging Technology, CAS Key Laboratory of Health Informatics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Ting Wang
- The First Affiliated Hospital, Medical Imaging Centre, Hengyang Medical School, University of South China, Hengyang, Hunan, China
- Institute of Medical Imaging, Hengyang Medical School, University of South China, Hengyang, China
| | - Jinghui Fang
- Laboratory of Ultrasound Molecular Imaging, The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Hanyinghong Su
- Institute of Medical Imaging, Hengyang Medical School, University of South China, Hengyang, China
| | - Zhang Xiao
- College of Mechanical Engineering, University of South China, Hengyang, China
| | - Yingao Peng
- Institute of Medical Imaging, Hengyang Medical School, University of South China, Hengyang, China
| | - Xiaowen Liang
- Institute of Medical Imaging, Hengyang Medical School, University of South China, Hengyang, China
| | - Xiaojing Gong
- The Research Center for Biomedical Optics and Molecular Imaging, Shenzhen Key Laboratory for Molecular Imaging, Guangdong Provincial Key Laboratory of Biomedical Optical Imaging Technology, CAS Key Laboratory of Health Informatics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Zhiyi Chen
- The First Affiliated Hospital, Medical Imaging Centre, Hengyang Medical School, University of South China, Hengyang, Hunan, China
- Institute of Medical Imaging, Hengyang Medical School, University of South China, Hengyang, China
- The Seventh Affiliated Hospital University of South China/ Hunan Veterans Administration Hospital, Hengyang Medical School, University of South China, Changsha, Hunan, China
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Guidozzi N, Menon N, Chidambaram S, Markar SR. The role of artificial intelligence in the endoscopic diagnosis of esophageal cancer: a systematic review and meta-analysis. Dis Esophagus 2023; 36:doad048. [PMID: 37480192 PMCID: PMC10789250 DOI: 10.1093/dote/doad048] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 07/23/2023]
Abstract
Early detection of esophageal cancer is limited by accurate endoscopic diagnosis of subtle macroscopic lesions. Endoscopic interpretation is subject to expertise, diagnostic skill, and thus human error. Artificial intelligence (AI) in endoscopy is increasingly bridging this gap. This systematic review and meta-analysis consolidate the evidence on the use of AI in the endoscopic diagnosis of esophageal cancer. The systematic review was carried out using Pubmed, MEDLINE and Ovid EMBASE databases and articles on the role of AI in the endoscopic diagnosis of esophageal cancer management were included. A meta-analysis was also performed. Fourteen studies (1590 patients) assessed the use of AI in endoscopic diagnosis of esophageal squamous cell carcinoma-the pooled sensitivity and specificity were 91.2% (84.3-95.2%) and 80% (64.3-89.9%). Nine studies (478 patients) assessed AI capabilities of diagnosing esophageal adenocarcinoma with the pooled sensitivity and specificity of 93.1% (86.8-96.4) and 86.9% (81.7-90.7). The remaining studies formed the qualitative summary. AI technology, as an adjunct to endoscopy, can assist in accurate, early detection of esophageal malignancy. It has shown superior results to endoscopists alone in identifying early cancer and assessing depth of tumor invasion, with the added benefit of not requiring a specialized skill set. Despite promising results, the application in real-time endoscopy is limited, and further multicenter trials are required to accurately assess its use in routine practice.
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Affiliation(s)
- Nadia Guidozzi
- Department of General Surgery, University of Witwatersrand, Johannesburg, South Africa
| | - Nainika Menon
- Department of General Surgery, Oxford University Hospitals, Oxford, UK
| | - Swathikan Chidambaram
- Academic Surgical Unit, Department of Surgery and Cancer, Imperial College London, St Mary’s Hospital, London, UK
| | - Sheraz Rehan Markar
- Department of General Surgery, Oxford University Hospitals, Oxford, UK
- Nuffield Department of Surgery, University of Oxford, Oxford, UK
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Tsunoda M, Miura Y, Osawa H, Nagayama M, Kagaya Y, Funayama Y, Kobayashi T, Togashi M, Hayashi H, Hiraoka Y, Nomoto Y, Iwashita C, Ino Y, Takahashi H, Fukuda H, Lefor AK, Yamamoto H. Impact of linked color imaging and blue laser imaging on the diagnosis of esophageal squamous cell carcinoma in iodine unstained areas. Kaohsiung J Med Sci 2023; 39:533-543. [PMID: 36810969 DOI: 10.1002/kjm2.12660] [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: 08/26/2022] [Revised: 01/09/2023] [Accepted: 01/18/2023] [Indexed: 02/24/2023] Open
Abstract
The pink color sign in iodine unstained areas is useful to differentiate esophageal squamous cell carcinoma (ESCC) from other lesions. However, some ESCCs have obscure color findings which affect the ability of endoscopists to differentiate these lesions and determine the resection line. Using white light imaging (WLI), linked color imaging (LCI) and blue laser imaging (BLI), 40 early ESCCs were retrospectively evaluated using images before and after iodine staining. Visibility scores for ESCC by expert and non-expert endoscopists were compared using these three modalities and color differences measured for malignant lesions and surrounding mucosa. BLI had the highest score and color difference without iodine staining. Each determination with iodine was much higher than without iodine regardless of the modality. With iodine, ESCC mainly appeared pink, purple and green using WLI, LCI and BLI, respectively and visibility scores determined by non-experts and experts were significantly higher for LCI (both p < 0.001) and BLI (p = 0.018 and p < 0.001) than for WLI. The score with LCI was significantly higher than with BLI among non-experts (p = 0.035). With iodine, the color difference using LCI was twice that with WLI and one with BLI was significantly larger than with WLI (p < 0.001). These greater tendencies were found regardless of location, depth of cancer or intensity of pink color using WLI. In conclusion, areas of ESCC unstained by iodine were easily recognized using LCI and BLI. Visibility of these lesions is excellent even by non-expert endoscopists, suggesting that this method is useful to diagnose ESCC and determine the resection line.
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Affiliation(s)
- Masato Tsunoda
- Division of Gastroenterology, Department of Medicine, Jichi Medical University, Shimotsuke, Japan
| | - Yoshimasa Miura
- Division of Gastroenterology, Department of Medicine, Jichi Medical University, Shimotsuke, Japan
| | - Hiroyuki Osawa
- Division of Gastroenterology, Department of Medicine, Jichi Medical University, Shimotsuke, Japan
| | - Manabu Nagayama
- Division of Gastroenterology, Department of Medicine, Jichi Medical University, Shimotsuke, Japan
| | - Yuka Kagaya
- Division of Gastroenterology, Department of Medicine, Jichi Medical University, Shimotsuke, Japan
| | - Yohei Funayama
- Division of Gastroenterology, Department of Medicine, Jichi Medical University, Shimotsuke, Japan
| | - Takuma Kobayashi
- Division of Gastroenterology, Department of Medicine, Jichi Medical University, Shimotsuke, Japan
| | - Mami Togashi
- Division of Gastroenterology, Department of Medicine, Jichi Medical University, Shimotsuke, Japan
| | - Hiroki Hayashi
- Division of Gastroenterology, Department of Medicine, Jichi Medical University, Shimotsuke, Japan
| | - Yuji Hiraoka
- Division of Gastroenterology, Department of Medicine, Jichi Medical University, Shimotsuke, Japan
| | - Yoshie Nomoto
- Division of Gastroenterology, Department of Medicine, Jichi Medical University, Shimotsuke, Japan
| | - Chihiro Iwashita
- Division of Gastroenterology, Department of Medicine, Jichi Medical University, Shimotsuke, Japan
| | - Yuji Ino
- Division of Gastroenterology, Department of Medicine, Jichi Medical University, Shimotsuke, Japan
| | - Haruo Takahashi
- Division of Gastroenterology, Department of Medicine, Jichi Medical University, Shimotsuke, Japan
| | - Hisashi Fukuda
- Division of Gastroenterology, Department of Medicine, Jichi Medical University, Shimotsuke, Japan
| | | | - Hironori Yamamoto
- Division of Gastroenterology, Department of Medicine, Jichi Medical University, Shimotsuke, Japan
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Umegaki E, Misawa H, Handa O, Matsumoto H, Shiotani A. Linked Color Imaging for Stomach. Diagnostics (Basel) 2023; 13. [PMID: 36766572 DOI: 10.3390/diagnostics13030467] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 01/19/2023] [Accepted: 01/24/2023] [Indexed: 02/01/2023] Open
Abstract
Image-enhanced endoscopy (IEE) plays an important role in the detection and further examination of gastritis and early gastric cancer (EGC). Linked color imaging (LCI) is also useful for detecting and evaluating gastritis, gastric intestinal metaplasia as a pre-cancerous lesion, and EGC. LCI provides a clear excellent endoscopic view of the atrophic border and the demarcation line under various conditions of gastritis. We could recognize gastritis as the lesions of the diffuse redness to purple color area with LCI. On the other hand, EGCs are recognized as the lesions of the orange-red, orange, or orange-white color area in the lesion of the purple color area, which is the surround atrophic mucosa with LCI. With further prospective randomized studies, we will be able to evaluate the diagnosis ability for EGC by IEE, and it will be necessary to evaluate the role of WLI/IEE and the additional effects of the diagnostic ability by adding IEE to WLI in future.
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Garcia-Font N, Mitchell-Heggs R, Saxena K, Gabbert C, Taylor G, Mastroberadino G, Spooner PA, Gobbo F, Dabrowska JK, Chattarji S, Kind PC, Schultz SR, Morris RGM. Ca2+ imaging of self and other in medial prefrontal cortex during social dominance interactions in a tube test. Proc Natl Acad Sci U S A 2022; 119:e2107942119. [PMID: 35881809 DOI: 10.1073/pnas.2107942119] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [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] [Indexed: 11/30/2022] Open
Abstract
The study of social dominance interactions between animals offers a window onto the decision-making involved in establishing dominance hierarchies and an opportunity to examine changes in social behavior observed in certain neurogenetic disorders. Competitive social interactions, such as in the widely used tube test, reflect this decision-making. Previous studies have focused on the different patterns of behavior seen in the dominant and submissive animal, neural correlates of effortful behavior believed to mediate the outcome of such encounters, and interbrain correlations of neural activity. Using a rigorous mutual information criterion, we now report that neural responses recorded with endoscopic calcium imaging in the prelimbic zone of the medial prefrontal cortex show unique correlations to specific dominance-related behaviors. Interanimal analyses revealed cell/behavior correlations that are primarily with an animal's own behavior or with the other animal's behavior, or the coincident behavior of both animals (such as pushing by one and resisting by the other). The comparison of unique and coincident cells helps to disentangle cell firing that reflects an animal's own or the other's specific behavior from situations reflecting conjoint action. These correlates point to a more cognitive rather than a solely behavioral dimension of social interactions that needs to be considered in the design of neurobiological studies of social behavior. These could prove useful in studies of disorders affecting social recognition and social engagement, and the treatment of disorders of social interaction.
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Wang H, Yang H, Chen Z, Zheng Q, Jiang H, Feng PXL, Xie H. Development of Dual-Frequency PMUT Arrays Based on Thin Ceramic PZT for Endoscopic Photoacoustic Imaging. J Microelectromech Syst 2021; 30:770-782. [PMID: 35528228 PMCID: PMC9075345 DOI: 10.1109/jmems.2021.3096733] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
This paper presents a dual-frequency piezoelectric micromachined ultrasonic transducer (pMUT) array based on thin ceramic PZT for endoscopic photoacoustic imaging (PAI) applications. With a chip size of 7 × 7 mm2, the pMUT array consists of 256 elements, half of which have a lower resonant frequency of 1.2 MHz and the other half have a higher resonant frequency of 3.4 MHz. Ceramic PZT, with outstanding piezoelectric coefficients, has been successfully thinned down to a thickness of only 4 μ by using wafer bonding and chemical mechanical polishing (CMP) techniques and employed as the piezoelectric layer of the pMUT elements. The diaphragm diameters of the lower-frequency and higher-frequency elements are 220 μm and 120 μm, respectively. The design methodology, multiphysics modeling, fabrication process, and characterization of the pMUTs are presented in detail. The fabricated pMUT array has been fully characterized via electrical, mechanical, and acoustic measurements. The measured maximum responsivities of the lower- and higher- frequency elements reach 110 nm/V and 30 nm/V at their respective resonances. The measured cross-couplings of the lower-frequency elements and higher-frequency elements are about 9% and 5%, respectively. Furthermore, PAI experiments with pencil leads embedded into an agar phantom have been conducted, which clearly shows the advantages of using dual-frequency pMUT arrays to provide comprehensive photoacoustic images with high spatial resolution and large signal-to-noise ratio simultaneously.
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Affiliation(s)
- Haoran Wang
- Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL 32611, USA
| | - Hao Yang
- Department of Medical Engineering, University of South Florida, Tampa, FL 33620, USA
| | - Zhenfang Chen
- MEMS Engineering and Materials Inc., Sunnyvale, CA 94086, USA
| | - Qincheng Zheng
- School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China
| | - Huabei Jiang
- Department of Medical Engineering, University of South Florida, Tampa, FL 33620, USA
| | - Philip X-L Feng
- Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL 32611, USA
| | - Huikai Xie
- School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China
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Coron E, Esnaud E, Chevallier P, Bessard A, Perez Cuadrado-Robles E, David G, Bossard C, Brégéon J, Jarry A, Neunlist M, Quénéhervé L. Early remodeling of the colonic mucosa after allogeneic hematopoietic stem cells transplantation: An open-label controlled pilot study on 19 patients. United European Gastroenterol J 2021; 9:955-963. [PMID: 34431618 PMCID: PMC8498402 DOI: 10.1002/ueg2.12128] [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] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Accepted: 02/12/2020] [Indexed: 12/17/2022] Open
Abstract
Background Graft‐versus‐host disease (GVHD), particularly acute digestive GVHD (aDGVHD), is a severe complication of allogeneic hematopoietic stem cell transplantation (allo‐HSCT). It is necessary to identify predictive factors of GVHD to adapt prophylactic treatment. Objective In this context, our pilot study aimed (i) to determine whether an early remodeling of the colonic mucosa occurred after allo‐HSCT and (ii) to identify potential predictive mucosal markers of aDGVHD after allo‐HSCT. Methods Between day 21 and day 28 after the allo‐HSCT, 19 allo‐HSCT patients were included and had a rectosigmoidoscopy with probe‐based confocal laser endomicroscopy (pCLE) recording and biopsies. Sixteen patients were included in the control group. Morphological (pCLE), functional (intestinal permeability), and inflammatory parameters (cytokine multiplex immunoassay) were assessed. Results Among allo‐HSCT patients, 11 patients developed GVHD, and 6 of them developed aDGVHD. Morphological and functional changes of the colonic mucosa occurred after allo‐HSCT. Indeed, the perimeter of colonic crypts was significantly increased in allo‐HSCT patients compared to controls as well as crypt lumen fluorescein leakage (53% vs. 9%), whereas crypts sphericity, roundness, Feret diameter, and mean vessel area were significantly decreased in allo‐HSCT patients compared to the control group. In addition, interleukin‐6 (IL‐6), IL‐33, and IL‐15 levels in the supernatants of 24 h explant cultures of colonic biopsies were significantly increased in allo‐HSCT patients compared to controls. Finally, there was no difference in pCLE parameters, intestinal permeability, and inflammatory cytokines between patients who developed aDGVHD and those who did not. Conclusion This pilot study identified early colonic mucosa remodeling after allo‐HSCT conditioning therapy, that is morphological and functional mucosal alterations as well as mucosal inflammation. As to whether these changes are first steps in GVHD initiation and could be considered as predictive biomarkers of aDGVHD need to be determined in a larger cohort of patients.
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Affiliation(s)
- Emmanuel Coron
- Université de Nantes, INSERM, The Enteric Nervous System in Gut and Brain Disorders, IMAD, Nantes, France.,Institut des Maladies de l'Appareil Digestif, IMAD, CHU Nantes, Hôpital Hôtel-Dieu, Nantes, France
| | - Elise Esnaud
- Institut des Maladies de l'Appareil Digestif, IMAD, CHU Nantes, Hôpital Hôtel-Dieu, Nantes, France
| | - Patrice Chevallier
- Service d'Hématologie, CHU de Nantes, Hôpital Hôtel Dieu, Nantes, France
| | - Anne Bessard
- Université de Nantes, INSERM, The Enteric Nervous System in Gut and Brain Disorders, IMAD, Nantes, France
| | - Enrique Perez Cuadrado-Robles
- Service de Gastroentérologie, Hôpital Européen Georges Pompidou, Assistance Publique des Hôpitaux de Paris, Paris, France
| | - Grégoire David
- Université de Nantes, INSERM, The Enteric Nervous System in Gut and Brain Disorders, IMAD, Nantes, France
| | - Céline Bossard
- Service d'Anatomie et Cytologie Pathologique, Université de Nantes, CHU Nantes, Inserm, CRCINA, Nantes, France
| | - Jérémy Brégéon
- Université de Nantes, INSERM, The Enteric Nervous System in Gut and Brain Disorders, IMAD, Nantes, France
| | - Anne Jarry
- Université de Nantes, Inserm, CRCINA, Nantes, France
| | - Michel Neunlist
- Université de Nantes, INSERM, The Enteric Nervous System in Gut and Brain Disorders, IMAD, Nantes, France.,Institut des Maladies de l'Appareil Digestif, IMAD, CHU Nantes, Hôpital Hôtel-Dieu, Nantes, France
| | - Lucille Quénéhervé
- Université de Nantes, INSERM, The Enteric Nervous System in Gut and Brain Disorders, IMAD, Nantes, France.,Institut des Maladies de l'Appareil Digestif, IMAD, CHU Nantes, Hôpital Hôtel-Dieu, Nantes, France
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9
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Gerges C, Neumann H, Ishaq S, Sivanathan V, Galle PR, Neuhaus H, Neumann H. Evaluation of a novel colonoscope offering flexibility adjuster - a retrospective observational study. Therap Adv Gastroenterol 2021; 14:17562848211013494. [PMID: 34104209 PMCID: PMC8170286 DOI: 10.1177/17562848211013494] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2021] [Accepted: 04/07/2021] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND Although colonoscopy is the gold standard for colorectal cancer screening, colonic looping may make complete colonoscopy challenging. Commonly available stiffening device colonoscopy has been described as helpful but not effective enough to prevent looping. In this context the effect on cecal intubation time and rate was described differently in various studies and in some studies had no impact on cecal intubation time at all. The aim of this study was to evaluate whether a novel colonoscope with gradual stiffness (Fujifilm EC760R-V/I- flexibility adjuster, Tokyo, Japan) using four significantly different grades of stiffness can be an alternative to established devices in terms of loop prevention, cecal intubation rate and time, adverse events, and patient/examiner satisfaction. METHODS Consecutive patients without previous colorectal surgery were analyzed retrospectively. Colonoscopy was performed with the new colonoscope and performance characteristics, including time to cecum, withdrawal time, total examination time, and patient and endoscopist satisfaction were recorded. RESULTS Among 180 consecutive procedures, 98.3% of examinations were complete to the cecum. The endoscopic flexibility adjuster was used in 150 of 180 cases (83.3%). Overall, the device was scored by the examiner as helpful to prevent looping in 146 of the 150 cases (97.7%). Mean cecal intubation time was 6.5 min, with 35% of examination performed in under 5 min with a mean withdrawal time of 7 min. Mean total examination time was 18 min. Patient satisfaction was rated as high in all examinations performed. CONCLUSION The new flexibility adjuster colonoscope was shown to be helpful in loop prevention, allowed for fast and successful cecal intubation, and led to a high rate of patients satisfaction.
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Affiliation(s)
- Christian Gerges
- Department of Gastroenterology, Evangelisches
Krankenhaus Düsseldorf, Düsseldorf, Germany
| | | | - Sauid Ishaq
- Department of Gastroenterology, Dudley Group
NHS, Foundation Trust and Birmingham City University, Birmingham, UK
| | - Visvakanth Sivanathan
- Department of Interdisciplinary Endoscopy, I.
Medizinische Klinik und Poliklinik, University Hospital, Mainz,
Germany
| | - Peter R. Galle
- Department of Interdisciplinary Endoscopy, I.
Medizinische Klinik und Poliklinik, University Hospital, Mainz,
Germany
| | - Horst Neuhaus
- Department of Gastroenterology, Evangelisches
Krankenhaus Düsseldorf, Düsseldorf, Germany
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10
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Bogomilsky MR, Polunin MM, Soldatsky YL, Minasyan VS, Ivanenko AM, Kulmakov SA. [Transcanal endoscopic middle ear surgery in children with chronic suppurative otitis media]. Vestn Otorinolaringol 2021; 86:25-29. [PMID: 33720647 DOI: 10.17116/otorino20218601125] [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] [Indexed: 11/17/2022]
Abstract
Otomicroscopic surgery remains the gold standard in the surgical treatment of patients with CHS. Endoscopic ear surgery is gaining more and more importance as an adjunct to microsurgery. Recently, thanks to the resolution of the endoscopic technique, endoscopic surgery can be used as an independent method. This article presents the results of endoscopic tympanoplasty, endoscopic removal of the tympanic cholesteatoma, performed on the basis of the otorhinolaryngology department of the Morozov Children's City Clinical Hospital. Research has shown that transcanal endoscopic surgery is an effective alternative to traditional otomicroscopic surgery. Advantage in minimal impact and improved visualization of all quadrants of the tympanic membrane, the anterior tympanomeatal angle of the NSP, and structures of the middle ear.
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Affiliation(s)
- M R Bogomilsky
- N.I. Pirogov Russian National Research Medical University, Moscow, Russia
| | - M M Polunin
- N.I. Pirogov Russian National Research Medical University, Moscow, Russia.,Morozovskaya Children's City Clinical Hospital, Moscow, Russia
| | - Yu L Soldatsky
- N.I. Pirogov Russian National Research Medical University, Moscow, Russia.,Morozovskaya Children's City Clinical Hospital, Moscow, Russia
| | - V S Minasyan
- N.I. Pirogov Russian National Research Medical University, Moscow, Russia
| | - A M Ivanenko
- Morozovskaya Children's City Clinical Hospital, Moscow, Russia
| | - S A Kulmakov
- N.I. Pirogov Russian National Research Medical University, Moscow, Russia.,Morozovskaya Children's City Clinical Hospital, Moscow, Russia
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11
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Struyvenberg MR, de Groof AJ, Kahn A, Weusten BLAM, Fleischer DE, Ganguly EK, Konda VJA, Lightdale CJ, Pleskow DK, Sethi A, Smith MS, Trindade AJ, Wallace MB, Wolfsen HC, Tearney GJ, Meijer SL, Leggett CL, Bergman JJGHM, Curvers WL. Multicenter study on the diagnostic performance of multiframe volumetric laser endomicroscopy targets for Barrett's esophagus neoplasia with histopathology correlation. Dis Esophagus 2020; 33:5860590. [PMID: 32607539 PMCID: PMC7720006 DOI: 10.1093/dote/doaa062] [Citation(s) in RCA: 5] [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] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 05/27/2020] [Accepted: 06/01/2020] [Indexed: 12/11/2022]
Abstract
Volumetric laser endomicroscopy (VLE) has been shown to improve detection of early neoplasia in Barrett's esophagus (BE). However, diagnostic performance using histopathology-correlated VLE regions of interest (ROIs) has not been adequately studied. We evaluated the diagnostic accuracy of VLE assessors for identification of early BE neoplasia in histopathology-correlated VLE ROIs. In total, 191 ROIs (120 nondysplastic and 71 neoplastic) from 50 BE patients were evaluated in a random order using a web-based module. All ROIs contained histopathology correlations enabled by VLE laser marking. Assessors were blinded to endoscopic BE images and histology. ROIs were first scored as nondysplastic or neoplastic. Level of confidence was assigned to the predicted diagnosis. Outcome measures were: (i) diagnostic performance of VLE assessors for identification of BE neoplasia in all VLE ROIs, defined as accuracy, sensitivity, and specificity; (ii) diagnostic performance of VLE assessors for only high level of confidence predictions; and (iii) interobserver agreement. Accuracy, sensitivity, and specificity for BE neoplasia identification were 79% (confidence interval [CI], 75-83), 75% (CI, 71-79), and 81% (CI, 76-86), respectively. When neoplasia was identified with a high level of confidence, accuracy, sensitivity, and specificity were 88%, 83%, and 90%, respectively. The overall strength of interobserver agreement was fair (k = 0.29). VLE assessors can identify BE neoplasia with reasonable diagnostic accuracy in histopathology-correlated VLE ROIs, and accuracy is enhanced when BE neoplasia is identified with high level of confidence. Future work should focus on renewed VLE image reviewing criteria and real-time automatic assessment of VLE scans.
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Affiliation(s)
- M R Struyvenberg
- Department of Gastroenterology and Hepatology, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - A J de Groof
- Department of Gastroenterology and Hepatology, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - A Kahn
- Division of Gastroenterology and Hepatology, Mayo Clinic, Scottsdale, AZ, USA
| | - B L A M Weusten
- Department of Gastroenterology and Hepatology, St. Antonius Hospital, Nieuwegein, The Netherlands
| | - D E Fleischer
- Division of Gastroenterology and Hepatology, Mayo Clinic, Scottsdale, AZ, USA
| | - E K Ganguly
- Department of Gastroenterology and Hepatology, University of Vermont Medical Center, Burlington, VT, USA
| | - V J A Konda
- Department of Gastroenterology and Hepatology, Baylor University Medical Center, Dallas, TX, USA
| | - C J Lightdale
- Division of Gastroenterology and Hepatology, New York-Presbyterian Hospital, New York, NY, USA
| | - D K Pleskow
- Department of Gastroenterology and Hepatology, Beth Israel Deaconess Medical Center, Boston, MA, USA
| | - A Sethi
- Department of Gastroenterology and Hepatology, Columbia University Medical Center, New York, NY, USA
| | - M S Smith
- Division of Gastroenterology and Hepatology, Mount Sinai West and Mount Sinai St. Luke’s Hospitals, New York, NY, USA
| | - A J Trindade
- Division of Gastroenterology and Hepatology, Zucker School of Medicine at Hofstra/Northwell, Long Island Jewish Medical Center, New York, NY, USA
| | - M B Wallace
- Division of Gastroenterology and Hepatology, Mayo Clinic, Jacksonville, NY, USA
| | - H C Wolfsen
- Division of Gastroenterology and Hepatology, Mayo Clinic, Jacksonville, NY, USA
| | - G J Tearney
- Department of Pathology, Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA
| | - S L Meijer
- Department of Pathology, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - C L Leggett
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - J J G H M Bergman
- Department of Gastroenterology and Hepatology, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands,Address correspondence to: Professor Dr J.J.G.H.M. Bergman, Department of Gastroenterology and Hepatology, Amsterdam UMC, location AMC, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands.
| | - W L Curvers
- Department of Gastroenterology and Hepatology, Catharina Hospital, Eindhoven, The Netherlands
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12
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Gulati S, Patel M, Emmanuel A, Haji A, Hayee B, Neumann H. The future of endoscopy: Advances in endoscopic image innovations. Dig Endosc 2020; 32:512-522. [PMID: 31286574 DOI: 10.1111/den.13481] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [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: 04/14/2019] [Accepted: 07/01/2019] [Indexed: 02/08/2023]
Abstract
The latest state of the art technological innovations have led to a palpable progression in endoscopic imaging and may facilitate standardisation of practice. One of the most rapidly evolving modalities is artificial intelligence with recent studies providing real-time diagnoses and encouraging results in the first randomised trials to conventional endoscopic imaging. Advances in functional hypoxia imaging offer novel opportunities to be used to detect neoplasia and the assessment of colitis. Three-dimensional volumetric imaging provides spatial information and has shown promise in the increased detection of small polyps. Studies to date of self-propelling colonoscopes demonstrate an increased caecal intubation rate and possibly offer patients a more comfortable procedure. Further development in robotic technology has introduced ex vivo automated locomotor upper gastrointestinal and small bowel capsule devices. Eye-tracking has the potential to revolutionise endoscopic training through the identification of differences in experts and non-expert endoscopist as trainable parameters. In this review, we discuss the latest innovations of all these technologies and provide perspective into the exciting future of diagnostic luminal endoscopy.
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Affiliation(s)
- Shraddha Gulati
- King's Institute of Therapeutic Endoscopy, King's College Hospital NHS Foundation Trust, London, UK
| | - Mehul Patel
- King's Institute of Therapeutic Endoscopy, King's College Hospital NHS Foundation Trust, London, UK
| | - Andrew Emmanuel
- King's Institute of Therapeutic Endoscopy, King's College Hospital NHS Foundation Trust, London, UK
| | - Amyn Haji
- King's Institute of Therapeutic Endoscopy, King's College Hospital NHS Foundation Trust, London, UK
| | - Bu'Hussain Hayee
- King's Institute of Therapeutic Endoscopy, King's College Hospital NHS Foundation Trust, London, UK
| | - Helmut Neumann
- Department of Medicine, University Hospital Mainz, Mainz, Germany
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13
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Ehrlich K, Parker HE, McNicholl DK, Reid P, Reynolds M, Bussiere V, Crawford G, Deighan A, Garrett A, Kufcsák A, Norberg DR, Spennati G, Steele G, Szoor-McElhinney H, Jimenez M. Demonstrating the Use of Optical Fibres in Biomedical Sensing: A Collaborative Approach for Engagement and Education. Sensors (Basel) 2020; 20:E402. [PMID: 31936827 PMCID: PMC7014119 DOI: 10.3390/s20020402] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 12/19/2019] [Accepted: 12/23/2019] [Indexed: 12/29/2022]
Abstract
This paper demonstrates how research at the intersection of physics, engineering, biology and medicine can be presented in an interactive and educational way to a non-scientific audience. Interdisciplinary research with a focus on prevalent diseases provides a relatable context that can be used to engage with the public. Respiratory diseases are significant contributors to avoidable morbidity and mortality and have a growing social and economic impact. With the aim of improving lung disease understanding, new techniques in fibre-based optical endomicroscopy have been recently developed. Here, we present a novel engagement activity that resembles a bench-to-bedside pathway. The activity comprises an inexpensive educational tool (<$70) adapted from a clinical optical endomicroscopy system and tutorials that cover state-of-the-art research. The activity was co-created by high school science teachers and researchers in a collaborative way that can be implemented into any engagement development process.
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Affiliation(s)
- Katjana Ehrlich
- EPSRC IRC Hub in Optical Molecular Sensing & Imaging, Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, UK; (A.K.); (D.R.N.); (H.S.-M.)
| | - Helen E. Parker
- EPSRC IRC Hub in Optical Molecular Sensing & Imaging, Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, UK; (A.K.); (D.R.N.); (H.S.-M.)
| | - Duncan K. McNicholl
- Scottish Universities Physics Alliance (SUPA), Institute of Photonics and Quantum Science, Heriot-Watt University, Edinburgh EH14 4AS, UK;
| | - Peter Reid
- College of Science and Engineering Engagement Team, King’s Buildings, University of Edinburgh, Edinburgh EH9 3BF, UK; (P.R.); (M.R.)
| | - Mark Reynolds
- College of Science and Engineering Engagement Team, King’s Buildings, University of Edinburgh, Edinburgh EH9 3BF, UK; (P.R.); (M.R.)
| | - Vincent Bussiere
- James Watt School of Engineering, Biomedical Engineering Division, University of Glasgow, Glasgow G12 8LT, UK; (V.B.); (A.G.); (G.S.); (M.J.)
| | | | | | - Alice Garrett
- James Watt School of Engineering, Biomedical Engineering Division, University of Glasgow, Glasgow G12 8LT, UK; (V.B.); (A.G.); (G.S.); (M.J.)
| | - András Kufcsák
- EPSRC IRC Hub in Optical Molecular Sensing & Imaging, Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, UK; (A.K.); (D.R.N.); (H.S.-M.)
| | - Dominic R. Norberg
- EPSRC IRC Hub in Optical Molecular Sensing & Imaging, Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, UK; (A.K.); (D.R.N.); (H.S.-M.)
| | - Giulia Spennati
- James Watt School of Engineering, Biomedical Engineering Division, University of Glasgow, Glasgow G12 8LT, UK; (V.B.); (A.G.); (G.S.); (M.J.)
| | - Gregor Steele
- Scottish Schools Education Research Centre (SSERC), Dunfermline KY11 8UU, UK;
| | - Helen Szoor-McElhinney
- EPSRC IRC Hub in Optical Molecular Sensing & Imaging, Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, UK; (A.K.); (D.R.N.); (H.S.-M.)
| | - Melanie Jimenez
- James Watt School of Engineering, Biomedical Engineering Division, University of Glasgow, Glasgow G12 8LT, UK; (V.B.); (A.G.); (G.S.); (M.J.)
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14
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Garofalakis A, Kruglik SG, Mansuryan T, Gillibert A, Thiberville L, Louradour F, Vever-Bizet C, Bourg-Heckly G. Characterization of a multicore fiber image guide for nonlinear endoscopic imaging using two-photon fluorescence and second-harmonic generation. J Biomed Opt 2019; 24:1-12. [PMID: 31646840 PMCID: PMC7000885 DOI: 10.1117/1.jbo.24.10.106004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Accepted: 07/25/2019] [Indexed: 06/10/2023]
Abstract
Multiphoton microscopy (MPM) has the capacity to record second-harmonic generation (SHG) and endogenous two-photon excitation fluorescence (2PEF) signals emitted from biological tissues. The development of fiber-based miniaturized endomicroscopes delivering pulses in the femtosecond range will allow the transfer of MPM to clinical endoscopy. We present real-time SHG and 2PEF ex vivo images using an endomicroscope, which totally complies with clinical endoscopy regulations. This system is based on the proximal scanning of a commercial multicore image guide (IG). For understanding the inhomogeneities of the recorded images, we quantitatively characterize the IG at the single-core level during nonlinear excitation. The obtained results suggest that these inhomogeneities originate from the variable core geometries that, therefore, exhibit variable nonlinear and dispersive properties. Finally, we propose a method based on modulation of dispersion precompensation to address the image inhomogeneity issue and, as a proof of concept, we demonstrate its capability to improve the nonlinear image quality.
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Affiliation(s)
- Anikitos Garofalakis
- Sorbonne Université, Centre National de la Recherche Scientifique, Institut de Biologie Paris-Seine, Laboratoire Jean Perrin, Paris, France
| | - Sergei G. Kruglik
- Sorbonne Université, Centre National de la Recherche Scientifique, Institut de Biologie Paris-Seine, Laboratoire Jean Perrin, Paris, France
| | | | - André Gillibert
- Rouen University Hospital, Department of Biostatistics, Rouen, France
| | - Luc Thiberville
- CHU Rouen, Service de Pneumologie, Oncologie Thoracique et Soins Intensifs Respiratoires, Rouen, France
| | | | - Christine Vever-Bizet
- Sorbonne Université, Centre National de la Recherche Scientifique, Institut de Biologie Paris-Seine, Laboratoire Jean Perrin, Paris, France
| | - Genevieve Bourg-Heckly
- Sorbonne Université, Centre National de la Recherche Scientifique, Institut de Biologie Paris-Seine, Laboratoire Jean Perrin, Paris, France
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15
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Abstract
Endoscopic imaging of the stomach is improving. In addition to narrow band imaging, other methods, for example, blue light imaging and linked color imaging, are now available and can be combined with artificial intelligence systems to obtain information on the gastric mucosa and detect early gastric cancer. Immunohistochemistry is only recommended as an ancillary stain in case of chronic active gastritis without Helicobacter pylori detection by standard staining, and recommendations to exclude false negative H. pylori results have been made. Molecular methods using real-time PCR, droplet digital PCR, or amplification refractory mutation system PCR have shown a high accuracy, both for detecting H. pylori and for clarithromycin susceptibility testing, and can now be used in clinical practice for targeted therapy. The most reliable non-invasive test remains the 13 C-urea breath test. Large data sets show that DOB values are higher in women and that the cut-off for positivity could be decreased to 2.74 DOB. Stool antigen tests using monoclonal antibodies are widely used and may be a good alternative to UBT, particularly in countries with a high prevalence of H. pylori infection. Attempts to improve serology by looking at specific immunodominant antigens to distinguish current and past infection have been made. The interest of Gastropanel® which also tests pepsinogen levels was confirmed.
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Affiliation(s)
- Athanasios Makristathis
- Division for Clinical Microbiology, Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria
| | - Alexander M Hirschl
- Division for Clinical Microbiology, Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria
| | - Francis Mégraud
- French National Reference Center for Campylobacters and Helicobacters, Bacteriology Laboratory, CHU Pellegrin, Bordeaux, France.,INSERM, UMR1053, BaRITOn, University of Bordeaux, Bordeaux, France
| | - Emilie Bessède
- French National Reference Center for Campylobacters and Helicobacters, Bacteriology Laboratory, CHU Pellegrin, Bordeaux, France.,INSERM, UMR1053, BaRITOn, University of Bordeaux, Bordeaux, France
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16
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Li Y, Zhu Z, Jing JC, Chen JJ, Heidari E, He Y, Zhu J, Ma T, Yu M, Zhou Q, Chen Z. High-Speed Integrated Endoscopic Photoacoustic and Ultrasound Imaging System. IEEE J Sel Top Quantum Electron 2019; 25:7102005. [PMID: 31447542 PMCID: PMC6707714 DOI: 10.1109/jstqe.2018.2869614] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Endoscopic integrated photoacoustic and ultrasound imaging has the potential for early detection of the cancer in the gastrointestinal tract. Currently, slow imaging speed is one of the limitations for clinical translation. Here, we developed a high speed integrated endoscopic PA and US imaging system, which is able to perform PA and US imaging simultaneously up to 50 frames per second. Using this system, the architectural morphology and vasculature of the rectum wall were visualized from a Sprague Dawley rat in-vivo.
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Affiliation(s)
- Yan Li
- Y. L. , Z. Z. , J. J. , J. C., E. H., Y. H., J. Z., and Z. Chen are with the Department of Biomedical Engineering and the Beckman Laser Institute, University of California, Irvine, CA 92697, USA (; , ; ; ; ; ; ). T. M. , M. Y. and Q. Zhou are with Department of Ophthalmology and Biomedical Engineering, University of Southern California, Los Angeles, CA 90089 USA (; ; )
| | - Zhikai Zhu
- Y. L. , Z. Z. , J. J. , J. C., E. H., Y. H., J. Z., and Z. Chen are with the Department of Biomedical Engineering and the Beckman Laser Institute, University of California, Irvine, CA 92697, USA (; , ; ; ; ; ; ). T. M. , M. Y. and Q. Zhou are with Department of Ophthalmology and Biomedical Engineering, University of Southern California, Los Angeles, CA 90089 USA (; ; )
| | - Joseph C Jing
- Y. L. , Z. Z. , J. J. , J. C., E. H., Y. H., J. Z., and Z. Chen are with the Department of Biomedical Engineering and the Beckman Laser Institute, University of California, Irvine, CA 92697, USA (; , ; ; ; ; ; ). T. M. , M. Y. and Q. Zhou are with Department of Ophthalmology and Biomedical Engineering, University of Southern California, Los Angeles, CA 90089 USA (; ; )
| | - Jason J Chen
- Y. L. , Z. Z. , J. J. , J. C., E. H., Y. H., J. Z., and Z. Chen are with the Department of Biomedical Engineering and the Beckman Laser Institute, University of California, Irvine, CA 92697, USA (; , ; ; ; ; ; ). T. M. , M. Y. and Q. Zhou are with Department of Ophthalmology and Biomedical Engineering, University of Southern California, Los Angeles, CA 90089 USA (; ; )
| | - Emon Heidari
- Y. L. , Z. Z. , J. J. , J. C., E. H., Y. H., J. Z., and Z. Chen are with the Department of Biomedical Engineering and the Beckman Laser Institute, University of California, Irvine, CA 92697, USA (; , ; ; ; ; ; ). T. M. , M. Y. and Q. Zhou are with Department of Ophthalmology and Biomedical Engineering, University of Southern California, Los Angeles, CA 90089 USA (; ; )
| | - Youmin He
- Y. L. , Z. Z. , J. J. , J. C., E. H., Y. H., J. Z., and Z. Chen are with the Department of Biomedical Engineering and the Beckman Laser Institute, University of California, Irvine, CA 92697, USA (; , ; ; ; ; ; ). T. M. , M. Y. and Q. Zhou are with Department of Ophthalmology and Biomedical Engineering, University of Southern California, Los Angeles, CA 90089 USA (; ; )
| | - Jiang Zhu
- Y. L. , Z. Z. , J. J. , J. C., E. H., Y. H., J. Z., and Z. Chen are with the Department of Biomedical Engineering and the Beckman Laser Institute, University of California, Irvine, CA 92697, USA (; , ; ; ; ; ; ). T. M. , M. Y. and Q. Zhou are with Department of Ophthalmology and Biomedical Engineering, University of Southern California, Los Angeles, CA 90089 USA (; ; )
| | - Teng Ma
- Y. L. , Z. Z. , J. J. , J. C., E. H., Y. H., J. Z., and Z. Chen are with the Department of Biomedical Engineering and the Beckman Laser Institute, University of California, Irvine, CA 92697, USA (; , ; ; ; ; ; ). T. M. , M. Y. and Q. Zhou are with Department of Ophthalmology and Biomedical Engineering, University of Southern California, Los Angeles, CA 90089 USA (; ; )
| | - Mingyue Yu
- Y. L. , Z. Z. , J. J. , J. C., E. H., Y. H., J. Z., and Z. Chen are with the Department of Biomedical Engineering and the Beckman Laser Institute, University of California, Irvine, CA 92697, USA (; , ; ; ; ; ; ). T. M. , M. Y. and Q. Zhou are with Department of Ophthalmology and Biomedical Engineering, University of Southern California, Los Angeles, CA 90089 USA (; ; )
| | - Qifa Zhou
- Y. L. , Z. Z. , J. J. , J. C., E. H., Y. H., J. Z., and Z. Chen are with the Department of Biomedical Engineering and the Beckman Laser Institute, University of California, Irvine, CA 92697, USA (; , ; ; ; ; ; ). T. M. , M. Y. and Q. Zhou are with Department of Ophthalmology and Biomedical Engineering, University of Southern California, Los Angeles, CA 90089 USA (; ; )
| | - Zhongping Chen
- Y. L. , Z. Z. , J. J. , J. C., E. H., Y. H., J. Z., and Z. Chen are with the Department of Biomedical Engineering and the Beckman Laser Institute, University of California, Irvine, CA 92697, USA (; , ; ; ; ; ; ). T. M. , M. Y. and Q. Zhou are with Department of Ophthalmology and Biomedical Engineering, University of Southern California, Los Angeles, CA 90089 USA (; ; )
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17
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Huang L, Zhou X, Tang S. Optimization of frequency-doubled Er-doped fiber laser for miniature multiphoton endoscopy. J Biomed Opt 2018; 23:1-12. [PMID: 30574695 DOI: 10.1117/1.jbo.23.12.126503] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Accepted: 11/26/2018] [Indexed: 05/18/2023]
Abstract
Frequency-doubled femtosecond Er-doped fiber laser is a low-cost and portable excitation source suitable for multiphoton endoscopy. The frequency-doubled wavelength at 780 nm is used to excite the intrinsic fluorescence signal. The frequency-doubling with a periodically poled MgO : LiNbO3 (PPLN) is integrated in the distal end of the imaging head to achieve fiber connection. The imaging speed is further improved by optimizing the excitation laser source. A 0.3-mm length of PPLN crystal is selected and the Er-doped fiber laser is manipulated to match its bandwidth with the acceptance bandwidth of the PPLN. Through this optimization, a reduced pulsewidth of 80 fs of the frequency-doubled pulse is achieved. All-fiber dispersion compensation and pulse compression by single mode fiber is conducted, which makes the fiber laser directly fiber-coupled to the imaging head. An imaging speed of 4 frames / s is demonstrated on ex vivo imaging of unstained biological tissues, which is 10 times faster than our previous study using a 1-mm-long PPLN. The results show that miniature multiphoton endoscopy using frequency-doubled Er-doped fiber laser has great potential for clinical applications.
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Affiliation(s)
- Lin Huang
- University of British Columbia, Department of Electrical and Computer Engineering, Vancouver, Canada
| | - Xin Zhou
- University of British Columbia, Department of Electrical and Computer Engineering, Vancouver, Canada
| | - Shuo Tang
- University of British Columbia, Department of Electrical and Computer Engineering, Vancouver, Canada
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18
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Kirsten L, Schindler M, Morgenstern J, Erkkilä MT, Golde J, Walther J, Rottmann P, Kemper M, Bornitz M, Neudert M, Zahnert T, Koch E. Endoscopic optical coherence tomography with wide field-of-view for the morphological and functional assessment of the human tympanic membrane. J Biomed Opt 2018; 24:1-11. [PMID: 30516037 PMCID: PMC6975278 DOI: 10.1117/1.jbo.24.3.031017] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [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: 06/22/2018] [Accepted: 11/05/2018] [Indexed: 05/25/2023]
Abstract
An endoscopic optical coherence tomography (OCT) system with a wide field-of-view of 8 mm is presented, which combines the image capability of endoscopic imaging at the middle ear with the advantages of functional OCT imaging, allowing a morphological and functional assessment of the human tympanic membrane. The endoscopic tube has a diameter of 3.5 mm and contains gradient-index optics for simultaneous forward-viewing OCT and video endoscopy. The endoscope allows the three-dimensional visualization of nearly the entire tympanic membrane. In addition, the oscillation of the tympanic membrane is measured spatially resolved and in the frequency range between 500 Hz and 5 kHz with 125 Hz resolution, which is realized by phase-resolved Doppler OCT imaging during acoustical excitation with chirp signals. The applicability of the OCT system is demonstrated in vivo. Due to the fast image acquisition, structural and functional measurements are only slightly affected by motion artifacts.
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Affiliation(s)
- Lars Kirsten
- Technische Universität Dresden, Carl Gustav Carus Faculty of Medicine, Anesthesiology and Critical Care Medicine, Clinical Sensoring and Monitoring, Dresden, Germany
| | - Martin Schindler
- Technische Universität Dresden, Carl Gustav Carus Faculty of Medicine, Anesthesiology and Critical Care Medicine, Clinical Sensoring and Monitoring, Dresden, Germany
| | - Joseph Morgenstern
- Technische Universität Dresden, Carl Gustav Carus Faculty of Medicine, Otorhinolaryngology, Dresden, Germany
| | - Mikael Timo Erkkilä
- Technische Universität Dresden, Carl Gustav Carus Faculty of Medicine, Anesthesiology and Critical Care Medicine, Clinical Sensoring and Monitoring, Dresden, Germany
| | - Jonas Golde
- Technische Universität Dresden, Carl Gustav Carus Faculty of Medicine, Anesthesiology and Critical Care Medicine, Clinical Sensoring and Monitoring, Dresden, Germany
| | - Julia Walther
- Technische Universität Dresden, Carl Gustav Carus Faculty of Medicine, Anesthesiology and Critical Care Medicine, Clinical Sensoring and Monitoring, Dresden, Germany
- Technische Universität Dresden, Carl Gustav Carus Faculty of Medicine, Medical Physics and Biomedical Engineering, Dresden, Germany
| | - Pascal Rottmann
- Technische Universität Dresden, Carl Gustav Carus Faculty of Medicine, Anesthesiology and Critical Care Medicine, Clinical Sensoring and Monitoring, Dresden, Germany
| | - Max Kemper
- Technische Universität Dresden, Carl Gustav Carus Faculty of Medicine, Otorhinolaryngology, Dresden, Germany
| | - Matthias Bornitz
- Technische Universität Dresden, Carl Gustav Carus Faculty of Medicine, Otorhinolaryngology, Dresden, Germany
| | - Marcus Neudert
- Technische Universität Dresden, Carl Gustav Carus Faculty of Medicine, Otorhinolaryngology, Dresden, Germany
| | - Thomas Zahnert
- Technische Universität Dresden, Carl Gustav Carus Faculty of Medicine, Otorhinolaryngology, Dresden, Germany
| | - Edmund Koch
- Technische Universität Dresden, Carl Gustav Carus Faculty of Medicine, Anesthesiology and Critical Care Medicine, Clinical Sensoring and Monitoring, Dresden, Germany
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19
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Li Y, Lin R, Liu C, Chen J, Liu H, Zheng R, Gong X, Song L. In vivo photoacoustic/ultrasonic dual-modality endoscopy with a miniaturized full field-of-view catheter. J Biophotonics 2018; 11:e201800034. [PMID: 29635741 DOI: 10.1002/jbio.201800034] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [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: 01/29/2018] [Accepted: 04/04/2018] [Indexed: 05/21/2023]
Abstract
Endoscopy is an essential clinical tool for the diagnosis of gastrointestinal (GI) tract cancer. A photoacoustic system that elegantly combines optical and ultrasound endoscopy advantages by providing high-sensitivity functional information and large imaging depth is a potentially powerful tool for GI tract imaging. Recently, several photoacoustic endoscopic imaging systems have been proposed and developed. However, the relatively large size and rigid length of the catheter make it difficult to translate them into wide clinical applications; while the existing system of a relatively small catheter, capable of in vivo animal imaging, is unable to acquire full (360°) field-of-view cross-section images. In this study, we developed a photoacoustic/ultrasonic dual-modality endoscopic system and a corresponding miniaturized, encapsulated imaging catheter, which provides a full 360° field-of-view. The diameter of the catheter is 2.5 mm, which is compatible with the 2.8-mm instrumental channel of a conventional clinical optical endoscope. Using this system, we demonstrate in vivo 3-dimensional endoscopic photoacoustic/ultrasonic imaging of the colorectum of a healthy Sprague Dawley rat, by depicting vasculature and morphology of the GI tract. The significantly improved imaging field of view, reduced catheter size, high-quality imaging results suggest that the developed photoacoustic/ultrasonic dual-modality endoscopy has a great potential to be translated into a broad range of clinical applications in gastroenterology.
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Affiliation(s)
- Yan Li
- Research Laboratory for Biomedical Optics and Molecular Imaging, Shenzhen Key Laboratory for Molecular Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Riqiang Lin
- Research Laboratory for Biomedical Optics and Molecular Imaging, Shenzhen Key Laboratory for Molecular Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Chengbo Liu
- Research Laboratory for Biomedical Optics and Molecular Imaging, Shenzhen Key Laboratory for Molecular Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Jianhua Chen
- Research Laboratory for Biomedical Optics and Molecular Imaging, Shenzhen Key Laboratory for Molecular Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Huadong Liu
- Department of Cardiology, The Second Clinical Medical College of Jinan University, Shenzhen People's Hospital, Shenzhen, China
| | - Rongqin Zheng
- Department of Medical Ultrasound, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Xiaojing Gong
- Research Laboratory for Biomedical Optics and Molecular Imaging, Shenzhen Key Laboratory for Molecular Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Liang Song
- Research Laboratory for Biomedical Optics and Molecular Imaging, Shenzhen Key Laboratory for Molecular Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
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20
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Le HND, Nguyen H, Wang Z, Opfermann J, Leonard S, Krieger A, Kang JU. Demonstration of a laparoscopic structured-illumination three-dimensional imaging system for guiding reconstructive bowel anastomosis. J Biomed Opt 2018; 23:1-10. [PMID: 29797865 PMCID: PMC5964336 DOI: 10.1117/1.jbo.23.5.056009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Accepted: 04/30/2018] [Indexed: 05/11/2023]
Abstract
This paper reports the development and system analysis of a laparoscopic system based on structured illumination technique capable of three-dimensional (3-D) reconstruction of porcine intestine during surgical anastomosis (connection of tubular structures). A calibration target is used to validate the system performance and results show a depth of field of 20 mm with an accuracy of 0.008 mm and precision of 0.25 mm. The imaging system is used to reconstruct a quantitative 3-D depth measurement of ex vivo porcine bowel tissues to mimic an end-to-end bowel anastomosis scenario. We demonstrate that the system can detect a suture in the tissue and map homogeneous surfaces of the intestine with different tissue pigments, affirming the feasibility for depth quantization for guiding and assisting medical diagnostic decisions in anastomosis surgery.
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Affiliation(s)
- Hanh N. D. Le
- Johns Hopkins University, Department of Electrical and Computer Engineering, Baltimore, Maryland, United States
| | - Hieu Nguyen
- Catholic University of America, Department of Mechanical Engineering, Washington, DC, United States
| | - Zhaoyang Wang
- Catholic University of America, Department of Mechanical Engineering, Washington, DC, United States
| | - Justin Opfermann
- Children’s National Health System, Sheikh Zayed Institute for Pediatric Surgical Innovation, Washington, DC, United States
| | - Simon Leonard
- Johns Hopkins University, Department of Computer Science, Baltimore, Maryland, United States
| | - Axel Krieger
- University of Maryland, Department of Mechanical Engineering, College Park, Maryland, United States
| | - Jin U. Kang
- Johns Hopkins University, Department of Electrical and Computer Engineering, Baltimore, Maryland, United States
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21
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Luo Y, Cui D, Yu X, Bo E, Wang X, Wang N, Braganza CS, Chen S, Liu X, Xiong Q, Chen S, Chen S, Liu L. Endomicroscopic optical coherence tomography for cellular resolution imaging of gastrointestinal tracts. J Biophotonics 2018; 11:e201700141. [PMID: 28787543 DOI: 10.1002/jbio.201700141] [Citation(s) in RCA: 4] [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: 05/30/2017] [Revised: 08/04/2017] [Accepted: 08/06/2017] [Indexed: 06/07/2023]
Abstract
Our ability to detect neoplastic changes in gastrointestinal (GI) tracts is limited by the lack of an endomicroscopic imaging tool that provides cellular-level structural details of GI mucosa over a large tissue area. In this article, we report a fiber-optic-based micro-optical coherence tomography (μOCT) system and demonstrate its capability to acquire cellular-level details of GI tissue through circumferential scanning. The system achieves an axial resolution of 2.48 μm in air and a transverse resolution of 4.8 μm with a depth-of-focus (DOF) of ~150 μm. To mitigate the issue of limited DOF, we used a rigid sheath to maintain a circular lumen and center the distal-end optics. The sensitivity is tested to be 98.8 dB with an illumination power of 15.6 mW on the sample. With fresh swine colon tissues imaged ex vivo, detailed structures such as crypt lumens and goblet cells can be clearly resolved, demonstrating that this fiber-optic μOCT system is capable of visualizing cellular-level morphological features. We also demonstrate that time-lapsed frame averaging and imaging speckle reduction are essential for clearly visualizing cellular-level details. Further development of a clinically viable μOCT endomicroscope is likely to improve the diagnostic outcome of GI cancers.
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Affiliation(s)
- Yuemei Luo
- School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore
| | - Dongyao Cui
- School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore
| | - Xiaojun Yu
- School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore
| | - En Bo
- School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore
| | - Xianghong Wang
- School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore
| | - Nanshuo Wang
- School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore
| | - Cilwyn S Braganza
- School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore
| | - Shufen Chen
- School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore
| | - Xinyu Liu
- School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore
| | - Qiaozhou Xiong
- School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore
| | - Si Chen
- School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore
| | - Shi Chen
- School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore
| | - Linbo Liu
- School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, Singapore
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22
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Walther J, Schnabel C, Tetschke F, Rosenauer T, Golde J, Ebert N, Baumann M, Hannig C, Koch E. In vivo imaging in the oral cavity by endoscopic optical coherence tomography. J Biomed Opt 2018; 23:1-13. [PMID: 29500877 DOI: 10.1117/1.jbo.23.7.071207] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [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: 08/10/2017] [Accepted: 01/11/2018] [Indexed: 05/20/2023]
Abstract
The common way to diagnose hard and soft tissue irregularities in the oral cavity is initially the visual inspection by an experienced dentist followed by further medical examinations, such as radiological imaging and/or histopathological investigation. For the diagnosis of oral hard and soft tissues, the detection of early transformations is mostly hampered by poor visual access, low specificity of the diagnosis techniques, and/or limited feasibility of frequent screenings. Therefore, optical noninvasive diagnosis of oral tissue is promising to improve the accuracy of oral screening. Considering this demand, a rigid handheld endoscopic scanner was developed for optical coherence tomography (OCT). The novelty is the usage of a commercially near-infrared endoscope with fitting optics in combination with an established spectral-domain OCT system of our workgroup. By reaching a high spatial resolution, in vivo images of anterior and especially posterior dental and mucosal tissues were obtained from the oral cavity of two volunteers. The convincing image quality of the endoscopic OCT device is particularly obvious for the imaging of different regions of the human soft palate with highly scattering fibrous layer and capillary network within the lamina propria.
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Affiliation(s)
- Julia Walther
- TU Dresden, Faculty of Medicine Carl Gustav Carus, Anesthesiology and Intensive Care Medicine, Clini, Germany
- TU Dresden, Faculty of Medicine Carl Gustav Carus, Department of Medical Physics and Biomedical Engi, Germany
| | - Christian Schnabel
- TU Dresden, Faculty of Medicine Carl Gustav Carus, Anesthesiology and Intensive Care Medicine, Clini, Germany
| | - Florian Tetschke
- TU Dresden, Faculty of Medicine Carl Gustav Carus, Policlinic of Operative and Pediatric Dentistry,, Germany
| | - Tobias Rosenauer
- TU Dresden, Faculty of Medicine Carl Gustav Carus, Policlinic of Operative and Pediatric Dentistry,, Germany
| | - Jonas Golde
- TU Dresden, Faculty of Medicine Carl Gustav Carus, Anesthesiology and Intensive Care Medicine, Clini, Germany
| | - Nadja Ebert
- TU Dresden, Faculty of Medicine Carl Gustav Carus, Department of Radiotherapy and Radiooncology, Dre, Germany
- TU Dresden, Faculty of Medicine Carl Gustav Carus, OncoRay-National Center of Radiation Research in, Germany
| | - Michael Baumann
- TU Dresden, Faculty of Medicine Carl Gustav Carus, Department of Radiotherapy and Radiooncology, Dre, Germany
- TU Dresden, Faculty of Medicine Carl Gustav Carus, OncoRay-National Center of Radiation Research in, Germany
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiooncology, Dresden, Germany
| | - Christian Hannig
- TU Dresden, Faculty of Medicine Carl Gustav Carus, Policlinic of Operative and Pediatric Dentistry,, Germany
| | - Edmund Koch
- TU Dresden, Faculty of Medicine Carl Gustav Carus, Anesthesiology and Intensive Care Medicine, Clini, Germany
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23
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Abouei E, Lee AMD, Pahlevaninezhad H, Hohert G, Cua M, Lane P, Lam S, MacAulay C. Correction of motion artifacts in endoscopic optical coherence tomography and autofluorescence images based on azimuthal en face image registration. J Biomed Opt 2018; 23:1-13. [PMID: 29302954 DOI: 10.1117/1.jbo.23.1.016004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Accepted: 12/12/2017] [Indexed: 05/23/2023]
Abstract
We present a method for the correction of motion artifacts present in two- and three-dimensional in vivo endoscopic images produced by rotary-pullback catheters. This method can correct for cardiac/breathing-based motion artifacts and catheter-based motion artifacts such as nonuniform rotational distortion (NURD). This method assumes that en face tissue imaging contains slowly varying structures that are roughly parallel to the pullback axis. The method reduces motion artifacts using a dynamic time warping solution through a cost matrix that measures similarities between adjacent frames in en face images. We optimize and demonstrate the suitability of this method using a real and simulated NURD phantom and in vivo endoscopic pulmonary optical coherence tomography and autofluorescence images. Qualitative and quantitative evaluations of the method show an enhancement of the image quality.
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Affiliation(s)
- Elham Abouei
- University of British Columbia, Department of Physics and Astronomy, Vancouver, British Columbia, Canada
- British Columbia Cancer Research Center, Department of Integrative Oncology, Vancouver, British Colu, Canada
| | - Anthony M D Lee
- British Columbia Cancer Research Center, Department of Integrative Oncology, Vancouver, British Colu, Canada
| | - Hamid Pahlevaninezhad
- British Columbia Cancer Research Center, Department of Integrative Oncology, Vancouver, British Colu, Canada
| | - Geoffrey Hohert
- British Columbia Cancer Research Center, Department of Integrative Oncology, Vancouver, British Colu, Canada
| | - Michelle Cua
- British Columbia Cancer Research Center, Department of Integrative Oncology, Vancouver, British Colu, Canada
| | - Pierre Lane
- British Columbia Cancer Research Center, Department of Integrative Oncology, Vancouver, British Colu, Canada
| | - Stephen Lam
- British Columbia Cancer Research Center, Department of Integrative Oncology, Vancouver, British Colu, Canada
| | - Calum MacAulay
- British Columbia Cancer Research Center, Department of Integrative Oncology, Vancouver, British Colu, Canada
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24
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Tsai TH, Leggett CL, Trindade AJ, Sethi A, Swager AF, Joshi V, Bergman JJ, Mashimo H, Nishioka NS, Namati E. Optical coherence tomography in gastroenterology: a review and future outlook. J Biomed Opt 2017; 22:1-17. [PMID: 29260538 DOI: 10.1117/1.jbo.22.12.121716] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [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: 09/07/2017] [Accepted: 12/05/2017] [Indexed: 05/18/2023]
Abstract
Optical coherence tomography (OCT) is an imaging technique optically analogous to ultrasound that can generate depth-resolved images with micrometer-scale resolution. Advances in fiber optics and miniaturized actuation technologies allow OCT imaging of the human body and further expand OCT utilization in applications including but not limited to cardiology and gastroenterology. This review article provides an overview of current OCT development and its clinical utility in the gastrointestinal tract, including disease detection/differentiation and endoscopic therapy guidance, as well as a discussion of its future applications.
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Affiliation(s)
- Tsung-Han Tsai
- NinePoint Medical, Inc., Bedford, Massachusetts, United States
| | - Cadman L Leggett
- Mayo Clinics, Division of Gastroenterology and Hepatology, Rochester, Minnesota, United States
| | - Arvind J Trindade
- North Shore University Hospital and Hofstra Northwell School of Medicine, Division of Gastroenterolo, United States
| | - Amrita Sethi
- Columbia University Medical Center, Department of Gastroenterology, New York City, New York, United States
| | - Anne-Fré Swager
- Spaarne Gasthuis and Free University Medical Center, Amsterdam, The Netherlands
| | - Virendra Joshi
- Ochsner Clinic Foundation, Department of Gastroenterology, New Orleans, Louisiana, United States
| | - Jacques J Bergman
- Academic Medical Center, Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands
| | - Hiroshi Mashimo
- Veterans Affairs Boston Healthcare System and Harvard Medical School, Department of Gastroenterology, United States
| | - Norman S Nishioka
- Massachusetts General Hospital, Gastrointestinal Unit, Boston, Massachusetts, United States
| | - Eman Namati
- NinePoint Medical, Inc., Bedford, Massachusetts, United States
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25
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Faqih A, Broman KK, Huang LC, Phillips SE, Holzman MD, Pierce RA, Poulose BK, Yachimski PS. Frequency of endoscopic surveillance for Barrett's esophagus is influenced by health insurance status: results from a population-based analysis. Dis Esophagus 2017; 30:1-8. [PMID: 28881902 DOI: 10.1093/dote/dox080] [Citation(s) in RCA: 7] [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: 05/02/2017] [Indexed: 12/11/2022]
Abstract
Factors that influence the frequency of surveillance endoscopy for nondysplastic Barrett's esophagus are not well understood. The objective of this study is to assess factors which influence the frequency of endoscopic surveillance for Barrett's esophagus, including health insurance/third-party payer status. Cases of nondysplastic Barrett's esophagus undergoing esophagogastroduodenoscopy with biopsy were identified using longitudinal data from the Healthcare Utilization Project database in 2005-2006 and followed through 2011. The threshold for appropriate surveillance utilization was defined as two to four surveillance esophagogastroduodenoscopies over a standardized 5-year period. Patients' insurance status was designated as either Medicare, Medicaid, private, or noninsured. 36,676 cases of nondysplastic Barrett's esophagus were identified. Among these, 4,632 patients (12.6%) underwent between two and four surveillance esophagogastroduodenoscopies in 5 years of follow-up versus 31,975 patients (87.3%) who underwent fewer than two esophagogastroduodenoscopies during follow-up. Multivariate analysis found that Barrett's patients insured through Medicaid (OR 1.273; 95% CI = 1.065-1.522) or without insurance (OR = 2.453; 95% CI = 1.67-3.603) were at increased likelihood of being under-surveilled. This study identified a difference in frequency of surveillance esophagogastroduodenoscopy for Barrett's esophagus by payer status. Patients without health insurance and those whose primary insurance was Medicaid were at increased odds for under-surveillance. These data suggest that a more robust system for tracking and ensuring longitudinal follow-up of patients with Barrett's esophagus, with attention to the uninsured and underinsured population, may be needed to ensure optimal surveillance.
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Affiliation(s)
- A Faqih
- Department of Surgery.,Division of Gastroenterology, Hepatology, and Nutrition, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | | | | | | | | | | | | | - P S Yachimski
- Division of Gastroenterology, Hepatology, and Nutrition, Vanderbilt University Medical Center, Nashville, Tennessee, USA
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26
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Li J, Quirk BC, Noble PB, Kirk RW, Sampson DD, McLaughlin RA. Flexible needle with integrated optical coherence tomography probe for imaging during transbronchial tissue aspiration. J Biomed Opt 2017; 22:1-5. [PMID: 29022301 DOI: 10.1117/1.jbo.22.10.106002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [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: 06/23/2017] [Accepted: 09/08/2017] [Indexed: 06/07/2023]
Abstract
Transbronchial needle aspiration (TBNA) of small lesions or lymph nodes in the lung may result in nondiagnostic tissue samples. We demonstrate the integration of an optical coherence tomography (OCT) probe into a 19-gauge flexible needle for lung tissue aspiration. This probe allows simultaneous visualization and aspiration of the tissue. By eliminating the need for insertion and withdrawal of a separate imaging probe, this integrated design minimizes the risk of dislodging the needle from the lesion prior to aspiration and may facilitate more accurate placement of the needle. Results from in situ imaging in a sheep lung show clear distinction between solid tissue and two typical constituents of nondiagnostic samples (adipose and lung parenchyma). Clinical translation of this OCT-guided aspiration needle holds promise for improving the diagnostic yield of TBNA.
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Affiliation(s)
- Jiawen Li
- University of Adelaide, Adelaide Medical School, Australian Research Council Centre of Excellence fo, Australia
- University of Adelaide, Institute for Photonics and Advanced Sensing, Adelaide, South Australia, Australia
| | - Bryden C Quirk
- University of Adelaide, Adelaide Medical School, Australian Research Council Centre of Excellence fo, Australia
- University of Adelaide, Institute for Photonics and Advanced Sensing, Adelaide, South Australia, Australia
| | - Peter B Noble
- University of Western Australia, School of Human Sciences, Perth, Western Australia, Australia
- University of Western Australia, School of Paediatrics and Child Health, Centre for Neonatal Researc, Australia
| | - Rodney W Kirk
- University of Adelaide, Adelaide Medical School, Australian Research Council Centre of Excellence fo, Australia
- University of Adelaide, Institute for Photonics and Advanced Sensing, Adelaide, South Australia, Australia
| | - David D Sampson
- University of Western Australia, School of Electrical, Electronic and Computer Engineering, Optical+, Australia
- University of Western Australia, Centre for Microscopy, Characterisation and Analysis, Perth, Wester, Australia
| | - Robert A McLaughlin
- University of Adelaide, Adelaide Medical School, Australian Research Council Centre of Excellence fo, Australia
- University of Adelaide, Institute for Photonics and Advanced Sensing, Adelaide, South Australia, Australia
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27
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Lee HC, Ahsen OO, Liu JJ, Tsai TH, Huang Q, Mashimo H, Fujimoto JG. Assessment of the radiofrequency ablation dynamics of esophageal tissue with optical coherence tomography. J Biomed Opt 2017; 22:76001. [PMID: 28687822 PMCID: PMC5499807 DOI: 10.1117/1.jbo.22.7.076001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Accepted: 06/08/2017] [Indexed: 05/08/2023]
Abstract
Radiofrequency ablation (RFA) is widely used for the eradication of dysplasia and the treatment of early stage esophageal carcinoma in patients with Barrett’s esophagus (BE). However, there are several factors, such as variation of BE epithelium (EP) thickness among individual patients and varying RFA catheter-tissue contact, which may compromise RFA efficacy. We used a high-speed optical coherence tomography (OCT) system to identify and monitor changes in the esophageal tissue architecture from RFA. Two different OCT imaging/RFA application protocols were performed using an <italic<ex vivo</italic< swine esophagus model: (1) post-RFA volumetric OCT imaging for quantitative analysis of the coagulum formation using RFA applications with different energy settings, and (2) M-mode OCT imaging for monitoring the dynamics of tissue architectural changes in real time during RFA application. Post-RFA volumetric OCT measurements showed an increase in the coagulum thickness with respect to the increasing RFA energies. Using a subset of the specimens, OCT measurements of coagulum and coagulum + residual EP thickness were shown to agree with histology, which accounted for specimen shrinkage during histological processing. In addition, we demonstrated the feasibility of OCT for real-time visualization of the architectural changes during RFA application with different energy settings. Results suggest feasibility of using OCT for RFA treatment planning and guidance.
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Affiliation(s)
- Hsiang-Chieh Lee
- Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Cambridge, Massachusetts, United States
| | - Osman O. Ahsen
- Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Cambridge, Massachusetts, United States
| | - Jonathan J. Liu
- Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Cambridge, Massachusetts, United States
| | - Tsung-Han Tsai
- Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Cambridge, Massachusetts, United States
| | - Qin Huang
- Veterans Affairs Boston Healthcare System, Boston, Massachusetts, United States
- Harvard Medical School, Boston, Massachusetts, United States
| | - Hiroshi Mashimo
- Veterans Affairs Boston Healthcare System, Boston, Massachusetts, United States
- Harvard Medical School, Boston, Massachusetts, United States
| | - James G. Fujimoto
- Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Cambridge, Massachusetts, United States
- Address all correspondence to: James G. Fujimoto, E-mail:
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28
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Swager A, Boerwinkel DF, de Bruin DM, Weusten BL, Faber DJ, Meijer SL, van Leeuwen TG, Curvers WL, Bergman JJ. Volumetric laser endomicroscopy in Barrett's esophagus: a feasibility study on histological correlation. Dis Esophagus 2016; 29:505-12. [PMID: 25951873 DOI: 10.1111/dote.12371] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [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] [Indexed: 12/11/2022]
Abstract
Volumetric laser endomicroscopy (VLE) is a novel balloon-based optical coherence tomography (OCT) imaging technique that may improve detection of early neoplasia in Barrett's esophagus (BE). Most OCT studies lack a direct correlation between histology and OCT images. The aim is to investigate the optimal approach for achieving one-to-one correlation of ex-vivo VLE images of endoscopic resection (ER) specimens with histology. BE patients with and without early neoplasia underwent ER after delineating areas with electrocoagulation markers (ECM). After ER, specimens underwent additional ex-vivo marking with several different markers (ink, pin, Gold Probe) followed by ex-vivo VLE scanning. ER specimens were carefully sectioned into tissue blocks guided by the markers. Histology and VLE slides were considered a match if ≥ 2 markers were visible on both modalities and mucosal patterns aside from these markers matched on both histology and VLE. From 16 ER specimens 120 tissue blocks were sectioned of which 23 contained multiple markers. Fourteen histology-VLE matches were identified. ECMs and ink markers proved to be the most effective combination for matching. The last 6/16 ER specimens yielded 9/14 matches, demonstrating a learning curve due to methodological improvements in marker placement and tissue block sectioning. One-to-one correlation of VLE and histology is complex but feasible. The groundwork laid in this study will provide high-quality histology-VLE correlations that will allow further research on VLE features of early neoplasia in BE.
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Affiliation(s)
- A Swager
- Department of Gastroenterology and Hepatology, Academic Medical Center, Amsterdam, The Netherlands
| | - D F Boerwinkel
- Department of Gastroenterology and Hepatology, Academic Medical Center, Amsterdam, The Netherlands
| | - D M de Bruin
- Department of Biomedical Engineering and Physics, Academic Medical Center, Amsterdam, The Netherlands
| | - B L Weusten
- Department of Gastroenterology and Hepatology, Academic Medical Center, Amsterdam, The Netherlands
| | - D J Faber
- Department of Biomedical Engineering and Physics, Academic Medical Center, Amsterdam, The Netherlands
| | - S L Meijer
- Department of Pathology, Academic Medical Center, Amsterdam, The Netherlands
| | - T G van Leeuwen
- Department of Biomedical Engineering and Physics, Academic Medical Center, Amsterdam, The Netherlands
| | - W L Curvers
- Department of Gastroenterology and Hepatology, Catharina Hospital, Eindhoven, The Netherlands
| | - J J Bergman
- Department of Gastroenterology and Hepatology, Academic Medical Center, Amsterdam, The Netherlands
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29
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Kobara H, Mori H, Rafiq K, Matsunaga T, Fujihara S, Nishiyama N, Ayaki M, Yachida T, Tani J, Miyoshi H, Kato K, Kamada H, Yoneyama H, Morishita A, Tsutsui K, Iwama H, Haba R, Masaki T. Evaluation of gastric submucosal tumors using endoscopically visualized features with submucosal endoscopy. Oncol Lett 2014; 8:161-168. [PMID: 24959238 PMCID: PMC4063622 DOI: 10.3892/ol.2014.2126] [Citation(s) in RCA: 7] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Accepted: 04/10/2014] [Indexed: 12/13/2022] Open
Abstract
Although the macroscopic characteristics of submucosal tumors (SMTs), such as gastrointestinal stromal tumors (GISTs), have been characterized, the assessment of SMTs by their endoscopically visualized features (EVF; which are observed by endoscopic imaging under direct view) remains unevaluated. The aim of the present study was to investigate the potential of endoscopic diagnostics for SMTs using EVF. The EVF of 26 gastric SMT cases, in which the final pathological diagnosis was obtained by core biopsy using the submucosal endoscopy with mucosal flap method, were retrospectively reviewed. Each type of SMT was classified according to the following five EVF: Color, clarity, shape, tumor coating and solidity. Additionally, the EVF of 13 low-risk GISTs and 13 benign submucosal tumors (BSTs) were comparatively evaluated for the five abovementioned EVF. Similar trends were identified between the low-risk GISTs, granular cell tumors and the schwannoma with regard to EVF. However, while these tumors exhibited cloudy EVF, the leiomyomas tended to exhibit clear EVF. Among SMTs of the heterotopic pancreas type, the EVF demonstrated particularly small nodules of the pancreatic tissue itself. Although the sample size included in the present study is small, a classification system for gastric SMTs was proposed according to the EVF. When compared with the BST group, the GIST group demonstrated a significantly higher frequency of tumors that exhibited a combination of three EVF (white, cloudy and rigid) that are consistent with all gastric GISTs (P<0.05). Gastric SMTs may be classified based on the EVF, which indicates that the EVF possess potential diagnostic value for the differentiation of GISTs from BSTs.
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Affiliation(s)
- Hideki Kobara
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Miki, Kagawa 761-0793, Japan
| | - Hirohito Mori
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Miki, Kagawa 761-0793, Japan
| | - Kazi Rafiq
- Department of Pharmacology, Faculty of Medicine, Kagawa University, Miki, Kagawa 761-0793, Japan
| | - Tae Matsunaga
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Miki, Kagawa 761-0793, Japan
| | - Shintaro Fujihara
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Miki, Kagawa 761-0793, Japan
| | - Noriko Nishiyama
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Miki, Kagawa 761-0793, Japan
| | - Maki Ayaki
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Miki, Kagawa 761-0793, Japan
| | - Tatsuo Yachida
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Miki, Kagawa 761-0793, Japan
| | - Johji Tani
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Miki, Kagawa 761-0793, Japan
| | - Hisaaki Miyoshi
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Miki, Kagawa 761-0793, Japan
| | - Kiyohito Kato
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Miki, Kagawa 761-0793, Japan
| | - Hideki Kamada
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Miki, Kagawa 761-0793, Japan
| | - Hirohito Yoneyama
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Miki, Kagawa 761-0793, Japan
| | - Asahiro Morishita
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Miki, Kagawa 761-0793, Japan
| | - Kunihiko Tsutsui
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Miki, Kagawa 761-0793, Japan
| | - Hisakazu Iwama
- Life Science Research Center, Faculty of Medicine, Kagawa University, Miki, Kagawa 761-0793, Japan
| | - Reiji Haba
- Department of Diagnostic Pathology, Faculty of Medicine, Kagawa University, Miki, Kagawa 761-0793, Japan
| | - Tsutomu Masaki
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Miki, Kagawa 761-0793, Japan
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Tsai TH, Fujimoto JG, Mashimo H. Endoscopic Optical Coherence Tomography for Clinical Gastroenterology. Diagnostics (Basel) 2014; 4:57-93. [PMID: 26852678 PMCID: PMC4665545 DOI: 10.3390/diagnostics4020057] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2014] [Revised: 04/18/2014] [Accepted: 04/22/2014] [Indexed: 12/12/2022] Open
Abstract
Optical coherence tomography (OCT) is a real-time optical imaging technique that is similar in principle to ultrasonography, but employs light instead of sound waves and allows depth-resolved images with near-microscopic resolution. Endoscopic OCT allows the evaluation of broad-field and subsurface areas and can be used ancillary to standard endoscopy, narrow band imaging, chromoendoscopy, magnification endoscopy, and confocal endomicroscopy. This review article will provide an overview of the clinical utility of endoscopic OCT in the gastrointestinal tract and of recent achievements using state-of-the-art endoscopic 3D-OCT imaging systems.
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Affiliation(s)
- Tsung-Han Tsai
- Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
| | - James G Fujimoto
- Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
| | - Hiroshi Mashimo
- Veterans Affairs Boston Healthcare System and Harvard Medical School, Boston, MA 02115, USA.
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Boerwinkel DF, Holz JA, Hawkins DM, Curvers WL, Aalders MC, Weusten BL, Visser M, Meijer SL, Bergman JJ. Fluorescence spectroscopy incorporated in an Optical Biopsy System for the detection of early neoplasia in Barrett's esophagus. Dis Esophagus 2014; 28:345-51. [PMID: 24602242 DOI: 10.1111/dote.12193] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [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] [Indexed: 12/11/2022]
Abstract
Endoscopic surveillance is recommended for patients with Barrett's esophagus (BE) to detect high-grade intraepithelial neoplasia (HGIN) or early cancer (EC). Early neoplasia is difficult to detect with white light endoscopy and random biopsies are associated with sampling error. Fluorescence spectroscopy has been studied to distinguish non-dysplastic Barrett's epithelium (NDBE) from early neoplasia. The Optical Biopsy System (OBS) uses an optical fiber integrated in a regular biopsy forceps. This allows real-time spectroscopy and ensures spot-on correlation between the spectral signature and corresponding physical biopsy. The OBS may provide an easy-to-use endoscopic tool during BE surveillance. We aimed to develop a tissue-differentiating algorithm and correlate the discriminating properties of the OBS with the constructed algorithm to the endoscopist's assessment of the Barrett's esophagus. In BE patients undergoing endoscopy, areas suspicious for neoplasia and endoscopically non-suspicious areas were investigated with the OBS, followed by a correlating physical biopsy with the optical biopsy forceps. Spectra were correlated to histology and an algorithm was constructed to discriminate between HGIN/EC and NDBE using smoothed linear dicriminant analysis. The constructed classifier was internally cross-validated and correlated to the endoscopist's assessment of the BE segment. A total of 47 patients were included (39 males, age 66 years): 35 BE patients were referred with early neoplasia and 12 patients with NDBE. A total of 245 areas were investigated with following histology: 43 HGIN/EC, 66 low-grade intraepithelial neoplasia, 108 NDBE, 28 gastric or squamous mucosa. Areas with low-grade intraepithelial neoplasia and gastric/squamous mucosa were excluded. The area under the receiver operating characteristic curve of the constructed classifier was 0.78. Sensitivity and specificity for the discrimination between NDBE and HGIN/EC of OBS alone were 81% and 58% respectively. When OBS was combined with the endoscopist's assesssment, sensitivity was 91% and specificity 50%. If this protocol would have guided the decision to obtain biopsies, half of the biopsies would have been avoided, yet 4/43 areas containing HGIN/EC (9%) would have been inadvertently classified as unsuspicious. In this study, the OBS was used to construct an algorithm to discriminate neoplastic from non-neoplastic BE. Moreover, the feasibility of OBS with the constructed algorithm as an adjunctive tool to the endoscopist's assessment during endoscopic BE surveillance was demonstrated. These results should be validated in future studies. In addition, other probe-based spectroscopy techniques may be integrated in this optical biopsy forceps system.
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Affiliation(s)
- D F Boerwinkel
- Department of Gastroenterology and Hepatology, Academic Medical Centre, Amsterdam, The Netherlands
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Wei W, Li X, Zhou Q, Shung KK, Chen Z. Integrated ultrasound and photoacoustic probe for co-registered intravascular imaging. J Biomed Opt 2011; 16:106001. [PMID: 22029348 PMCID: PMC3206921 DOI: 10.1117/1.3631798] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2011] [Revised: 08/07/2011] [Accepted: 08/09/2011] [Indexed: 05/18/2023]
Abstract
We report on the synergy of an integrated ultrasound (US) and photoacoustic (PA) probe system for intravascular imaging. The combined dual-modality probe is based on a 39 MHz ring-shaped US transducer which detects both US echoes and laser-generated PA signals. By combining optical fiber, US transducer, and micromirror, we can obtain intravascular cross-sectional B-scan images by internal illumination of the sample. The performance of the probe is evaluated in a phantom study. Moreover, the coaxially designed probe also provides co-registered US and PA images of a normal rabbit aorta, which demonstrates the imaging ability of the dual-functional system, implying future clinical applications.
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Affiliation(s)
- Wei Wei
- Wuhan University, Department of Physics and Key Laboratory of Acoustic and Photonic Materials and Devices, Ministry of Education, Wuhan 430072, China
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Zhu Y, Terry NG, Woosley JT, Shaheen NJ, Wax A. Design and validation of an angle-resolved low-coherence interferometry fiber probe for in vivo clinical measurements of depth-resolved nuclear morphology. J Biomed Opt 2011; 16:011003. [PMID: 21280890 PMCID: PMC3033872 DOI: 10.1117/1.3520130] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
We present a novel Fourier-domain angle-resolved low-coherence interferometry (a /LCI) fiber probe designed for in vivo clinical application in gastrointestinal endoscopy. The a/LCI technique measures the depth-resolved angular scattering distribution to determine the size distribution and optical density of cell nuclei for assessing the health of epithelial tissues. Clinical application is enabled by an endoscopic fiber-optic probe that employs a 2.3-m-long coherent fiber bundle and is compatible with the standard 2.8-mm-diam biopsy channel of a gastroscope. The probe allows for real-time data acquisition by collecting the scattering from multiple angles in parallel, enabled by the Fourier domain approach. The performance of the probe is characterized through measurement of critical parameters. The depth-resolved sizing capability of the system is demonstrated using single- and double-layer microsphere phantoms with subwavelength sizing precision and accuracy achieved. Initial results from a clinical feasibility test are also presented to show in vivo application in the human esophagus.
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Affiliation(s)
- Yizheng Zhu
- Duke University, Department of Biomedical Engineering, 136 Hudson Hall, Durham, North Carolina 27708, USA
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34
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Xie T, Liu G, Kreuter K, Mahon S, Colt H, Mukai D, Peavy GM, Chen Z, Brenner M. In vivo three-dimensional imaging of normal tissue and tumors in the rabbit pleural cavity using endoscopic swept source optical coherence tomography with thoracoscopic guidance. J Biomed Opt 2009; 14:064045. [PMID: 20059283 PMCID: PMC2809499 DOI: 10.1117/1.3275478] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2009] [Revised: 09/21/2009] [Accepted: 11/02/2009] [Indexed: 05/20/2023]
Abstract
The purpose of this study was to develop a dynamic tunable focal distance graded-refractive-index lens rod-based high-speed 3-D swept-source (SS) optical coherence tomography (OCT) endoscopic system and demonstrate real-time in vivo, high-resolution (10-microm) imaging of pleural-based malignancies in an animal model. The GRIN lens-based 3-D SS OCT system, which images at 39 fps with 512 A-lines per frame, was able to capture images of and detect abnormalities during thoracoscopy in the thoracic cavity, including the pleura, chest wall, pericardium, and the lungs. The abnormalities were confirmed by histological evaluation and compared to OCT findings. The dynamic tunable focal distance range and rapid speed of the probe and SS prototype OCT system enabled this first-reported application of in vivo 3-D thoracoscopic imaging of pleural-based malignancies. The imaging probe of the system was found to be easily adaptable to various sites within the thoracic cavity and can be readily adapted to other sites, including rigid airway endoscopic examinations.
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Affiliation(s)
- Tuqiang Xie
- University of California Irvine, Beckman Laser Institute, 1002 Health Sciences Road East, Irvine, California 92612, USA.
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