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Flammia F, Innocenti T, Galluzzo A, Danti G, Chiti G, Grazzini G, Bettarini S, Tortoli P, Busoni S, Dragoni G, Gottin M, Galli A, Miele V. Branch duct-intraductal papillary mucinous neoplasms (BD-IPMNs): an MRI-based radiomic model to determine the malignant degeneration potential. Radiol Med 2023; 128:383-392. [PMID: 36826452 DOI: 10.1007/s11547-023-01609-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Accepted: 02/05/2023] [Indexed: 02/25/2023]
Abstract
BACKGROUND Branch duct-intraductal papillary mucinous neoplasms (BD-IPMNs) are the most common pancreatic cystic tumors and have a low risk of malignant transformation. Features able to early identify high-risk BD-IPMNs are lacking, and guidelines currently rely on the occurrence of worrisome features (WF) and high-risk stigmata (HRS). AIM In our study, we aimed to use a magnetic resonance imaging (MRI) radiomic model to identify features linked to a higher risk of malignant degeneration, and whether these appear before the occurrence of WF and HRS. METHODS We retrospectively evaluated adult patients with a known BD-IPMN who had had at least two contrast-enhanced MRI studies at our center and a 24-month minimum follow-up time. MRI acquisition protocol for the two examinations included pre- and post-contrast phases and diffusion-weighted imaging (DWI)/apparent diffusion coefficient (ADC) map. Patients were divided into two groups according to the development of WF or HRS at the end of the follow-up (Group 0 = no WF or HRS; Group 1 = WF or HRS). We segmented the MRI images and quantitative features were extracted and compared between the two groups. Features that showed significant differences (SF) were then included in a LASSO regression method to build a radiomic-based predictive model. RESULTS We included 50 patients: 31 in Group 0 and 19 in Group 1. No patients in this cohort developed HRS. At baseline, 47, 67, 38, and 68 SF were identified for pre-contrast T1-weighted (T1-W) sequence, post-contrast T1-W sequence, T2-weighted (T2- W) sequence, and ADC map, respectively. At the end of follow-up, we found 69, 78, 53, and 91 SF, respectively. The radiomic-based predictive model identified 16 SF: more particularly, 5 SF for pre-contrast T1-W sequence, 6 for post-contrast T1-W sequence, 3 for T2-W sequence, and 2 for ADC. CONCLUSION We identified radiomic features that correlate significantly with WF in patients with BD-IPMNs undergoing contrast-enhanced MRI. Our MRI-based radiomic model can predict the occurrence of WF.
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Affiliation(s)
- Federica Flammia
- Department of Radiology, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Tommaso Innocenti
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Viale G.B. Morgagni 50, 50134, Florence, Italy.,Clinical Gastroenterology Unit, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Antonio Galluzzo
- Department of Radiology, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Ginevra Danti
- Department of Radiology, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy.
| | - Giuditta Chiti
- Department of Radiology, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Giulia Grazzini
- Department of Radiology, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Silvia Bettarini
- Department of Health Physics, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Paolo Tortoli
- Department of Health Physics, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Simone Busoni
- Department of Health Physics, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Gabriele Dragoni
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Viale G.B. Morgagni 50, 50134, Florence, Italy.,Clinical Gastroenterology Unit, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Matteo Gottin
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Viale G.B. Morgagni 50, 50134, Florence, Italy.,Clinical Gastroenterology Unit, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Andrea Galli
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Viale G.B. Morgagni 50, 50134, Florence, Italy.,Clinical Gastroenterology Unit, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Vittorio Miele
- Department of Radiology, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
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Bicci E, Cozzi D, Cavigli E, Ruzga R, Bertelli E, Danti G, Bettarini S, Tortoli P, Mazzoni LN, Busoni S, Miele V. Reproducibility of CT radiomic features in lung neuroendocrine tumours (NETs) patients: analysis in a heterogeneous population. Radiol Med 2023; 128:203-211. [PMID: 36637739 PMCID: PMC9938819 DOI: 10.1007/s11547-023-01592-y] [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] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 01/04/2023] [Indexed: 01/14/2023]
Abstract
BACKGROUND The aim is to find a correlation between texture features extracted from neuroendocrine (NET) lung cancer subtypes, both Ki-67 index and the presence of lymph-nodal mediastinal metastases detected while using different computer tomography (CT) scanners. METHODS Sixty patients with a confirmed pulmonary NET histological diagnosis, a known Ki-67 status and metastases, were included. After subdivision of primary lesions in baseline acquisition and venous phase, 107 radiomic features of first and higher orders were extracted. Spearman's correlation matrix with Ward's hierarchical clustering was applied to confirm the absence of bias due to the database heterogeneity. Nonparametric tests were conducted to identify statistically significant features in the distinction between patient groups (Ki-67 < 3-Group 1; 3 ≤ Ki-67 ≤ 20-Group 2; and Ki-67 > 20-Group 3, and presence of metastases). RESULTS No bias arising from sample heterogeneity was found. Regarding Ki-67 groups statistical tests, seven statistically significant features (p value < 0.05) were found in post-contrast enhanced CT; three in baseline acquisitions. In metastasis classes distinction, three features (first-order class) were statistically significant in post-contrast acquisitions and 15 features (second-order class) in baseline acquisitions, including the three features distinguishing between Ki-67 groups in baseline images (MCC, ClusterProminence and Strength). CONCLUSIONS Some radiomic features can be used as a valid and reproducible tool for predicting Ki-67 class and hence the subtype of lung NET in baseline and post-contrast enhanced CT images. In particular, in baseline examination three features can establish both tumour class and aggressiveness.
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Affiliation(s)
- Eleonora Bicci
- Department of Emergency Radiology, Careggi University Hospital, Largo Brambilla 3, 50134 Florence, Italy
| | - Diletta Cozzi
- Department of Emergency Radiology, Careggi University Hospital, Largo Brambilla 3, 50134 Florence, Italy
- Italian Society of Medical and Interventional Radiology (SIRM), SIRM Foundation, 20122 Milan, Italy
| | - Edoardo Cavigli
- Department of Emergency Radiology, Careggi University Hospital, Largo Brambilla 3, 50134 Florence, Italy
| | - Ron Ruzga
- Department of Emergency Radiology, Careggi University Hospital, Largo Brambilla 3, 50134 Florence, Italy
| | - Elena Bertelli
- Department of Emergency Radiology, Careggi University Hospital, Largo Brambilla 3, 50134 Florence, Italy
| | - Ginevra Danti
- Department of Emergency Radiology, Careggi University Hospital, Largo Brambilla 3, 50134 Florence, Italy
| | - Silvia Bettarini
- Department of Health Physics, L.Go Brambilla, Careggi University Hospital, 50134 Florence, Italy
| | - Paolo Tortoli
- Department of Health Physics, L.Go Brambilla, Careggi University Hospital, 50134 Florence, Italy
| | - Lorenzo Nicola Mazzoni
- Department of Health Physics, AUSL Toscana Centro, Via Ciliegiole 97, 51100 Pistoia, Italy
| | - Simone Busoni
- Department of Health Physics, L.Go Brambilla, Careggi University Hospital, 50134 Florence, Italy
| | - Vittorio Miele
- Department of Emergency Radiology, Careggi University Hospital, Largo Brambilla 3, 50134 Florence, Italy
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Busoni S, Bruzzi M, Giomi S, Poggiali C, Quattroccchi M, Betti M, D’Urso D, Fedeli L, Mazzoni LN, Paolucci M, Rossi F, Taddeucci A, Bettarini S, Tortoli P, Belli G, Boschini A, Gasperi C, Campanella F. SURGEON EYE LENS AND WHOLE BODY EFFECTIVE DOSE CORRELATION IN INTERVENTIONAL PROCEDURES: A MULTI-PROCEDURE STUDY. Phys Med 2022. [DOI: 10.1016/s1120-1797(22)02366-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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Busoni S, Bruzzi M, Giomi S, Poggiali C, Quattrocchi M, Betti M, D'Urso D, Fedeli L, Mazzoni LN, Paolucci M, Rossi F, Taddeucci A, Bettarini S, Tortoli P, Belli G, Bernardi L, Gasperi C, Campanella F. Surgeon eye lens dose monitoring in interventional neuroradiology, cardiovascular and radiology procedures. Phys Med 2022; 104:123-128. [PMID: 36401940 DOI: 10.1016/j.ejmp.2022.11.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 10/27/2022] [Accepted: 11/01/2022] [Indexed: 11/17/2022] Open
Abstract
PURPOSE This study investigated the radiation dose to surgeon eye lens for single procedure and normalised to exposure parameters for eight selected neuroradiology, cardiovascular and radiology interventional procedures. METHODS The procedures investigated were diagnostic study, Arteriovenous Malformations treatment (AVM) and aneurysm embolization for neuroradiology procedures, Coronary Angiography and Percutaneous Transluminal Coronary Angioplasty (CA-PTCA), Pacemaker and Implantable Cardioverter-Defibrillator implantation (PM-ICD), Endovascular Aortic Repair (EVAR) and Fenestrated Endovascular Aortic Repair (FEVAR) for cardiovascular and electrophysiology procedures. CT-guided lung biopsy was also monitored. All procedures were performed with table-mounted and ceiling-suspended shields (0.5 mm lead equivalent thickness), except for FEVAR and PM-ICD where only a table mounted shield was present, and CT-guided lung biopsy where no shield was used. Dose assessment was performed using a dosemeter positioned close to the most exposed eye of the surgeon, outside the protective eyewear. RESULTS The surgeon most exposed eye lens median Hp(3) equivalent dose for a single procedure, without protective eyewear contribution, was 18 μSv for neuroradiology diagnostic study, 62 μSv for AVM, 38 μSv for aneurysm embolization, 33 μSv for CA-PTCA, 39 μSv for PM-ICD, 49 μSv for EVAR, 2500 μSv for FEVAR, 153 μSv for CT-guided lung biopsy. CONCLUSIONS In interventional procedures, the 20 mSv/year dose limit for surgeon eye lens exposure might be exceeded if shields or protective eyewear are not used. Surgeon eye lens doses, normalised to single procedures and to exposure parameters, are a valuable tool for determining appropriate radiation protection measures and dedicated eye lens dosemeter assignment.
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Affiliation(s)
- S Busoni
- Health Physics Unit, AOU Careggi (Firenze University Hospital), Italy.
| | - M Bruzzi
- Physics and Astronomy Department, University of Florence, Italy
| | - S Giomi
- Health Physics Unit, AOU Careggi (Firenze University Hospital), Italy; Physics and Astronomy Department, University of Florence, Italy
| | - C Poggiali
- Health Physics Unit, AOU Careggi (Firenze University Hospital), Italy; Physics and Astronomy Department, University of Florence, Italy
| | | | - M Betti
- Health Physics Unit, AUSL Toscana Centro, Italy
| | - D D'Urso
- Health Physics Unit, AULSS 2 Marca Trevigiana, Italy
| | - L Fedeli
- Health Physics Unit, AUSL Toscana Centro, Italy
| | - L N Mazzoni
- Health Physics Unit, AUSL Toscana Centro, Italy
| | - M Paolucci
- Health Physics Unit, AUSL Umbria 2, Italy
| | - F Rossi
- Health Physics Unit, AOU Careggi (Firenze University Hospital), Italy
| | - A Taddeucci
- Health Physics Unit, AOU Careggi (Firenze University Hospital), Italy
| | - S Bettarini
- Health Physics Unit, AOU Careggi (Firenze University Hospital), Italy
| | - P Tortoli
- Health Physics Unit, AOU Careggi (Firenze University Hospital), Italy
| | - G Belli
- Health Physics Unit, AOU Careggi (Firenze University Hospital), Italy
| | - L Bernardi
- Health Physics Unit, AUSL Toscana Centro, Italy
| | - C Gasperi
- Health Physics Unit, AUSL Toscana Sud-Est, Italy
| | - F Campanella
- Department of Medicine, Epidemiology, Workplace and Environmental Hygiene, INAIL, Italy
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Noferini L, Busoni S, Bettarini S, Tortoli P, Busto G, Ginestroni A, Lombardo I, Carlesi E, Di Pasquale F, Fainardi E, Belli G. COMPARISON OF TWO AUTOMATIC METHODS FOR SVD LESION SEGMENTATION IN MR IMAGING: A PRELIMINARY STUDY. Phys Med 2022. [DOI: 10.1016/s1120-1797(22)02435-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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Chiti G, Grazzini G, Flammia F, Matteuzzi B, Tortoli P, Bettarini S, Pasqualini E, Granata V, Busoni S, Messserini L, Pradella S, Massi D, Miele V. Gastroenteropancreatic neuroendocrine neoplasms (GEP-NENs): a radiomic model to predict tumor grade. Radiol Med 2022; 127:928-938. [DOI: 10.1007/s11547-022-01529-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Accepted: 07/12/2022] [Indexed: 11/30/2022]
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Pradella S, Mazzoni LN, Letteriello M, Tortoli P, Bettarini S, De Amicis C, Grazzini G, Busoni S, Palumbo P, Belli G, Miele V. FLORA software: semi-automatic LGE-CMR analysis tool for cardiac lesions identification and characterization. Radiol Med 2022; 127:589-601. [DOI: 10.1007/s11547-022-01491-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Accepted: 03/23/2022] [Indexed: 10/18/2022]
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Bicchierai G, Busoni S, Tortoli P, Bettarini S, Naro FD, De Benedetto D, Savi E, Bellini C, Miele V, Nori J. Single Center Evaluation of Comparative Breast Radiation dose of Contrast Enhanced Digital Mammography (CEDM), Digital Mammography (DM) and Digital Breast Tomosynthesis (DBT). Acad Radiol 2022; 29:1342-1349. [PMID: 35065889 DOI: 10.1016/j.acra.2021.12.022] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 12/17/2021] [Accepted: 12/22/2021] [Indexed: 11/25/2022]
Abstract
RATIONALE AND OBJECTIVES The aim of this retrospective study is to compare the radiation dose received during CEDM, short and long protocol (CEDM SP and CEDM LP), with dose received during DM and DBT on patients with varying breast thickness, age and density. MATERIALS AND METHODS Between January 2019 and December 2019, patients having 6214 DM, 3662 DBT and 173 CEDM examinations in our department were analyzed. Protocol total single breast AGD has been evaluated for all clinical imaging protocols, extracting AGD values and exposure data from the dose DICOM Structured Report (SR) information stored in the hospital PACS system. Protocol AGD was calculated as the sum of single projection AGDs carried out in every exam for each clinical protocol. A total amount of 23,383 exams for each breast were analyzed. Protocol AGDs, stratified as a function of patient breast compression thickness, age, and breast density were assessed. RESULTS The total protocol AGD median values for each protocol are: 2.8 mGy for DM, 3.2 mGy for DBT, 6.0 mGy for DM+DBT, 4.5 mGy for CEDM SP, 7.4 mGy for CEDM SP_DBT (CEDM SP protocol with DBT), 8.4 mGy for CEDM LP and 11.6 mGy for CEDM LP_DBT (CEDM LP protocol with DBT). CEDM SP AGD median value is 59% higher than DM AGD median value and 40% lesser than DM+DBT AGD median; this last difference was statistically confirmed with a p-value <0.001. AGD value for each standard breast CEDM SP projection results to be below 3-mGy limit. AGD value for each standard breast CEDM SP projection results to be below 3 mGy, as required by international legislation. For dense breasts, the AGD median value is 4.2 mGy, with the first and third quartile of 3.3 mGy and 6.0 mGy respectively; for non-dense breasts, the AGD median value is 4.7 mGy, with first and third quartile of 3.5 mGy and 6.3 mGy respectively. The difference between the two groups was statistically tested and confirmed, with a p-value of 0.039. CONCLUSION CEDM SP results in higher radiation exposure compared with conventional DM and DBT but lower than the Combo mode. The dose administered during the CEDM SP is lower in patients with dense breasts regardless of their size. An interesting outcome, considering the ongoing studies on CEDM screening in patients with dense breasts.
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Palatresi D, Fedeli F, Danti G, Pasqualini E, Castiglione F, Messerini L, Massi D, Bettarini S, Tortoli P, Busoni S, Pradella S, Miele V. Correlation of CT radiomic features for GISTs with pathological classification and molecular subtypes: preliminary and monocentric experience. Radiol Med 2022; 127:117-128. [PMID: 35022956 DOI: 10.1007/s11547-021-01446-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [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: 11/08/2021] [Accepted: 12/30/2021] [Indexed: 02/07/2023]
Abstract
PURPOSE Our primary purpose was to search for computed tomography (CT) radiomic features of gastrointestinal stromal tumors (GISTs) that could potentially correlate with the risk class according to the Miettinen classification. Subsequently, assess the existence of features with possible predictive value in differentiating responder from non-responder patients to first-line therapy with Imatinib. METHODS A retrospective study design was carried out using data from June 2009 to December 2020. We analyzed all the preoperative CTs of patients undergoing surgery for GISTs. We segmented non-contrast-enhanced CT (NCECT) and contrast-enhanced venous CT (CECT) images obtained either on three different CT scans (heterogeneous cohort) or on a single CT scan (homogeneous cohort). We then divided the patients into two groups according to Miettinen classification criteria and based on the predictive value of response to first-line therapy with Imatinib. RESULTS We examined 54 patients with pathological confirmation of GISTs. For the heterogeneous cohort, we found a statistically significant relationship between 57 radiomic features for NCECT and 56 radiomic features for CECT using the Miettinen risk classification. In the homogeneous cohort, we found the same relationship between 8 features for the NCECT and 5 features for CECT, all included in the heterogeneous cohort. The various radiomic features are distributed with different values in the two risk stratification groups according to the Miettinen classification. We also found some features for groups predictive of response to first-line therapy with Imatinib. CONCLUSIONS We found radiomic features that correlate with statistical significance for both the Miettinen risk classification and the molecular subtypes of response. All features found in the homogeneous study cohort were also found in the heterogeneous cohort. CT radiomic features may be useful in assessing the risk class and prognosis of GISTs.
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Affiliation(s)
- Daniele Palatresi
- Department of Radiology, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Filippo Fedeli
- Department of Radiology, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Ginevra Danti
- Department of Radiology, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy.
| | - Elisa Pasqualini
- Pathology Unit, Department of Health Sciences, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Francesca Castiglione
- Histopathology and Molecular Diagnostics Unit, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Luca Messerini
- Department of Experimental and Clinical Medicine, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Daniela Massi
- Pathology Unit, Department of Health Sciences, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Silvia Bettarini
- Medical Physics Department, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Paolo Tortoli
- Medical Physics Department, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Simone Busoni
- Medical Physics Department, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Silvia Pradella
- Department of Radiology, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
| | - Vittorio Miele
- Department of Radiology, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy
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Busoni S, Bruzzi M, Bettarini S, Betti M, Fedeli L, Mazzoni L, Quattrocchi M, Rossi F, Taddeucci A, Tortoli P, Belli G, Bernardi L, Doria S, Gasperi C, Gori C, Piffer S, Redapi L, Campanella F. Surgeon eye-lens dose monitoring in interventional procedures: a multi-centre and multi-procedure survey. Phys Med 2021. [DOI: 10.1016/s1120-1797(22)00060-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Noferini L, Busoni S, Belli G, Bettarini S, Tortoli P, Ono S, Chenevert T, Malyarenko D, Swanson S. Diffusion Kurtosis Imaging (DKI): measurement optimization on the basis of a quantitative diffusion phantom. Phys Med 2021. [DOI: 10.1016/s1120-1797(22)00232-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Fedeli L, Belli G, Ciccarone A, Coniglio A, Esposito M, Giannelli M, Sghedoni R, Tarducci R, Altabella L, Belligotti E, Benelli M, Bernardi L, Betti M, Caivano R, Carni M, Chiappiniello A, Cimolai S, Cretti F, Fulcheri C, Gasperi C, Giacometti M, Levrero F, Lizio D, Maieron M, Marzi S, Mascaro L, Mazzocchi S, Meliado G, Morzenti S, Niespolo A, Nocetti L, Noferini L, Oberhofer N, Orsingher L, Quattrocchi M, Ricci A, Savini A, Taddeucci A, Testa C, Tortoli P, Luchinat C, Tenori L, Gobbi G, Gori C, Busoni S, Mazzoni L. Multicenter comparison of MR scanners for quantitative diffusion weighted imaging: apparent diffusion coefficient dependence on acquisition plan and spatial position – preliminary results. Phys Med 2021. [DOI: 10.1016/s1120-1797(22)00475-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Belli G, Coniglio A, Bettarini S, Tortoli P, Fedeli L, Giannelli M, Mazzoni L, Nocetti L, Sghedoni R, Tarducci R, Belligotti E, Canzi C, Chiappiniello A, Cimolai S, Giovannini G, Lizio D, Marzi S, Mascaro L, Mazzocchi S, Meliadò G, Morzenti S, Niespolo A, Noferini L, Oberhofer N, Origgi D, Paruccini N, Quattrocchi M, Savini A, Solla I, Taddeucci A, Busoni S. Multicentre comparison of MR scanners (15T, 3T) for MR T1-T2 relaxometry. Phys Med 2021. [DOI: 10.1016/s1120-1797(22)00490-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Fedeli L, Benelli M, Busoni S, Belli G, Ciccarone A, Coniglio A, Esposito M, Nocetti L, Sghedoni R, Tarducci R, Altabella L, Belligotti E, Bettarini S, Betti M, Caivano R, Carnì M, Chiappiniello A, Cimolai S, Cretti F, Fulcheri C, Gasperi C, Giacometti M, Levrero F, Lizio D, Maieron M, Marzi S, Mascaro L, Mazzocchi S, Meliadò G, Morzenti S, Niespolo A, Noferini L, Oberhofer N, Orsingher L, Quattrocchi M, Ricci A, Savini A, Taddeucci A, Testa C, Tortoli P, Gobbi G, Gori C, Bernardi L, Giannelli M, Mazzoni LN. On the dependence of quantitative diffusion-weighted imaging on scanner system characteristics and acquisition parameters: A large multicenter and multiparametric phantom study with unsupervised clustering analysis. Phys Med 2021; 85:98-106. [PMID: 33991807 DOI: 10.1016/j.ejmp.2021.04.020] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [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: 01/21/2021] [Revised: 03/31/2021] [Accepted: 04/23/2021] [Indexed: 11/25/2022] Open
Abstract
PURPOSE The purpose of this multicenter phantom study was to exploit an innovative approach, based on an extensive acquisition protocol and unsupervised clustering analysis, in order to assess any potential bias in apparent diffusion coefficient (ADC) estimation due to different scanner characteristics. Moreover, we aimed at assessing, for the first time, any effect of acquisition plan/phase encoding direction on ADC estimation. METHODS Water phantom acquisitions were carried out on 39 scanners. DWI acquisitions (b-value = 0-200-400-600-800-1000 s/mm2) with different acquisition plans (axial, coronal, sagittal) and phase encoding directions (anterior/posterior and right/left, for the axial acquisition plan), for 3 orthogonal diffusion weighting gradient directions, were performed. For each acquisition setup, ADC values were measured in-center and off-center (6 different positions), resulting in an entire dataset of 84 × 39 = 3276 ADC values. Spatial uniformity of ADC maps was assessed by means of the percentage difference between off-center and in-center ADC values (Δ). RESULTS No significant dependence of in-center ADC values on acquisition plan/phase encoding direction was found. Ward unsupervised clustering analysis showed 3 distinct clusters of scanners and an association between Δ-values and manufacturer/model, whereas no association between Δ-values and maximum gradient strength, slew rate or static magnetic field strength was revealed. Several acquisition setups showed significant differences among groups, indicating the introduction of different biases in ADC estimation. CONCLUSIONS Unsupervised clustering analysis of DWI data, obtained from several scanners using an extensive acquisition protocol, allows to reveal an association between measured ADC values and manufacturer/model of scanner, as well as to identify suboptimal DWI acquisition setups for accurate ADC estimation.
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Affiliation(s)
- Luca Fedeli
- S.O.C. Fisica Sanitaria Pistoia-Prato, A.U.S.L. Toscana Centro, Italy
| | - Matteo Benelli
- Bioinformatics Unit, Hospital of Prato, A.U.S.L. Toscana Centro, Italy
| | - Simone Busoni
- U.O.C. Fisica Sanitaria, A.O.U. Careggi, Firenze, Italy
| | - Giacomo Belli
- U.O.C. Fisica Sanitaria, A.O.U. Careggi, Firenze, Italy
| | | | - Angela Coniglio
- Department of Medical Physics, P.O. S. Filippo Neri, Roma, Italy
| | - Marco Esposito
- S.C. Fisica Sanitaria Firenze-Empoli, A.U.S.L. Toscana Centro, Firenze, Italy
| | - Luca Nocetti
- Servizio di Fisica Medica, A.O.U. Policlinico di Modena, Modena, Italy
| | - Roberto Sghedoni
- Fisica Medica, Azienda USL - IRCCS di Reggio Emilia, Reggio Emilia, Italy
| | | | - Luisa Altabella
- Medical Physics Department, Hospital of Trento, APSS, Trento, Italy
| | - Eleonora Belligotti
- Fisica Medica ed Alte Tecnologie, A.O. Ospedali Riuniti Marche Nord, Pesaro, Italy
| | - Silvia Bettarini
- U.O.C. Fisica Sanitaria, A.O.U. Careggi, Firenze, Italy; Università degli Studi di Firenze, Firenze, Italy
| | - Margherita Betti
- S.O.C. Fisica Sanitaria Pistoia-Prato, A.U.S.L. Toscana Centro, Italy
| | - Rocchina Caivano
- U.O. Radioterapia Oncologica e Fisica Sanitaria, I.R.C.C.S. CROB, Rionero in Vulture (PZ), Italy
| | - Marco Carnì
- U.O.D. Fisica Sanitaria, A.O.U. Policlinico Umberto I, Roma, Italy
| | | | - Sara Cimolai
- U.O. Fisica Sanitaria, U.L.S.S. 2 Marca Trevigiana, Treviso, Italy
| | - Fabiola Cretti
- U.S.C. Fisica Sanitaria, A.O. Papa Giovanni XXIII, Bergamo, Italy
| | | | - Chiara Gasperi
- U.O.S.D. Fisica Sanitaria Arezzo, A.U.S.L. Toscana Sud Est, Arezzo, Italy
| | - Mara Giacometti
- S.O.D. Fisica Sanitaria, A.O.U. Ospedali Riuniti di Ancona, Ancona, Italy
| | - Fabrizio Levrero
- U.O. Fisica Sanitaria, Ospedale Policlinico San Martino, Genova, Italy
| | - Domenico Lizio
- Fisica Sanitaria, A.S.S.T. Grande Ospedale Metropolitano Niguarda, Milano, Italy
| | - Marta Maieron
- S.O.C. Fisica Sanitaria, A.S.U.I. Udine S. Maria della Misericordia, Udine, Italy
| | - Simona Marzi
- S.C. Laboratorio di Fisica Medica e Sistemi Esperti, Istituto Nazionale Tumori Regina Elena, Roma, Italy
| | - Lorella Mascaro
- U.O.C. Fisica Sanitaria, A.S.S.T. Spedali Civili, Brescia, Italy
| | - Silvia Mazzocchi
- S.C. Fisica Sanitaria Firenze-Empoli, A.U.S.L. Toscana Centro, Firenze, Italy
| | - Gabriele Meliadò
- U.O.C. Fisica Sanitaria, A.O.U. Integrata di Verona, Verona, Italy
| | | | - Alessandra Niespolo
- U.O.C. Fisica Sanitaria Area Nord, A.U.S.L. Toscana Nord Ovest, Lucca, Italy
| | | | - Nadia Oberhofer
- Servizio Aziendale di Fisica Sanitaria, A.S. dell'Alto Adige, Bolzano, Italy
| | - Laura Orsingher
- U.O. Fisica Sanitaria, U.L.S.S. 2 Marca Trevigiana, Treviso, Italy
| | | | | | - Alessandro Savini
- Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori (IRST) IRCCS, Meldola, Italy
| | | | - Claudia Testa
- Dipartimento di Fisica e Astronomia, Università di Bologna, Bologna, Italy
| | - Paolo Tortoli
- U.O.C. Fisica Sanitaria, A.O.U. Careggi, Firenze, Italy; Università degli Studi di Firenze, Firenze, Italy
| | - Gianni Gobbi
- Università degli Studi di Perugia, Perugia, Italy
| | - Cesare Gori
- Università degli Studi di Firenze, Firenze, Italy
| | - Luca Bernardi
- S.O.C. Fisica Sanitaria Pistoia-Prato, A.U.S.L. Toscana Centro, Italy
| | - Marco Giannelli
- Unit of Medical Physics, Pisa University Hospital "Azienda Ospedaliero-Universitaria Pisana", Pisa, Italy.
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Cocchi D, Ciagli E, Ancora A, Tortoli P, Carpini C, Cirone D, Rossi E, Frosini F, Vezzosi S. Improving patient waiting time of centralized front office service in a regional hub hospital using the discrete event simulation model. Technol Health Care 2020; 28:487-494. [PMID: 31903999 DOI: 10.3233/thc-191813] [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: 11/15/2022]
Abstract
BACKGROUND Today, hospital rankings are based not only on basic clinical indicators, but even on quality service indicators such as patient waiting times. Improving these indicators is a very important issue for hospital management, so finding a solution to achieve it in a simple and effective way is one of the greatest goals. OBJECTIVES The aim of this article is to evaluate the use of a discrete event simulation model to improve healthcare processes and reduce waiting time of patients and hospital costs. METHODS The case study proposed in this paper is the reorganization of non-clinical front office operation for the patients (i.e. booking of exams, delivering medical reports, etc.) of the Careggi University Hospital of Florence, to optimize the utilization of the human resources and to improve performances of the process. RESULTS The development and validation of the model was made according to an analysis of real processes and data, pre and post implementation of model outcomes. The new organization shows a decrease of waiting times from an average value of 10 minutes and 37 seconds to 5 minutes and 57 seconds (-44%). CONCLUSIONS This paper shows that discrete event simulation could be a precise, cost-limited tool to optimize hospital processes and performance.
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Affiliation(s)
- D Cocchi
- Department of Information Engineering, University of Florence, Florence, Italy
| | - E Ciagli
- Department of Information Engineering, University of Florence, Florence, Italy
| | - A Ancora
- Department of Information Engineering, University of Florence, Florence, Italy
| | - P Tortoli
- Department of Information Engineering, University of Florence, Florence, Italy
| | - C Carpini
- General Management Staff, Careggi University Hospital, Florence, Italy
| | - D Cirone
- General Management Staff, Careggi University Hospital, Florence, Italy
| | - E Rossi
- Innovation Control and Quality Area, Careggi University Hospital, Florence, Italy
| | - F Frosini
- Innovation Control and Quality Area, Careggi University Hospital, Florence, Italy
| | - S Vezzosi
- Innovation Control and Quality Area, Careggi University Hospital, Florence, Italy
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Cavigli L, Centi S, Borri C, Tortoli P, Panettieri I, Streit I, Ciofini D, Magni G, Rossi F, Siano S, Ratto F, Pini R. 1064-nm-resonant gold nanorods for photoacoustic theranostics within permissible exposure limits. J Biophotonics 2019; 12:e201900082. [PMID: 31155855 DOI: 10.1002/jbio.201900082] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [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: 03/05/2019] [Revised: 05/03/2019] [Accepted: 05/30/2019] [Indexed: 05/07/2023]
Abstract
Therapeutic and diagnostic methods based on photomechanical effects are attracting much current attention in contexts as oncology, cardiology and vascular surgery, for such applications as photoacoustic imaging or microsurgery. Their underlying mechanism is the generation of ultrasound or cavitation from the interaction of short optical pulses with endogenous dyes or targeted contrast agents. Among the latter, gold nanorods are outstanding candidates, but their use has mainly been reported for photoacoustic imaging and photothermal treatments. Conversely, much less is still known about their value as a precision tool for photomechanical manipulations, such as to impart local damage with high spatial resolution through the expansion and collapse of microbubbles. Here, we address the feasibility of gold nanorods exhibiting a distribution of surface plasmon resonances between about 900 to above 1100 nm as a contrast agent for photoacoustic theranostics. After testing their cytotoxicity and cellular uptake, we discuss their photostability and use to mediate cavitation and the photomechanical destruction of targeted cells. We find that the choice of a plasmonic band peaking around 1064 nm is key to enhance the translational potential of this approach. With respect to the standard alternative of 800 nm, at 1064 nm, relevant regulations on optical exposure are less restrictive and the photonic technology is more mature.
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Affiliation(s)
- Lucia Cavigli
- Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche IFAC-CNR, Sesto Fiorentino, Italy
| | - Sonia Centi
- Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche IFAC-CNR, Sesto Fiorentino, Italy
| | - Claudia Borri
- Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche IFAC-CNR, Sesto Fiorentino, Italy
| | - Paolo Tortoli
- Dipartimento di Fisica e Astronomia, Università degli Studi di Firenze, Sesto Fiorentino, Italy
| | - Ilaria Panettieri
- Dipartimento di Ingegneria Meccanica e Aerospaziale, Politecnico di Torino, Torino, Italy
| | | | - Daniele Ciofini
- Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche IFAC-CNR, Sesto Fiorentino, Italy
| | - Giada Magni
- Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche IFAC-CNR, Sesto Fiorentino, Italy
| | - Francesca Rossi
- Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche IFAC-CNR, Sesto Fiorentino, Italy
| | - Salvatore Siano
- Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche IFAC-CNR, Sesto Fiorentino, Italy
| | - Fulvio Ratto
- Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche IFAC-CNR, Sesto Fiorentino, Italy
| | - Roberto Pini
- Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche IFAC-CNR, Sesto Fiorentino, Italy
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Ramalli A, Guidi F, Boni E, Tortoli P. A real-time chirp-coded imaging system with tissue attenuation compensation. Ultrasonics 2015; 60:65-75. [PMID: 25749529 DOI: 10.1016/j.ultras.2015.02.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Revised: 12/30/2014] [Accepted: 02/16/2015] [Indexed: 06/04/2023]
Abstract
In ultrasound imaging, pulse compression methods based on the transmission (TX) of long coded pulses and matched receive filtering can be used to improve the penetration depth while preserving the axial resolution (coded-imaging). The performance of most of these methods is affected by the frequency dependent attenuation of tissue, which causes mismatch of the receiver filter. This, together with the involved additional computational load, has probably so far limited the implementation of pulse compression methods in real-time imaging systems. In this paper, a real-time low-computational-cost coded-imaging system operating on the beamformed and demodulated data received by a linear array probe is presented. The system has been implemented by extending the firmware and the software of the ULA-OP research platform. In particular, pulse compression is performed by exploiting the computational resources of a single digital signal processor. Each image line is produced in less than 20 μs, so that, e.g., 192-line frames can be generated at up to 200 fps. Although the system may work with a large class of codes, this paper has been focused on the test of linear frequency modulated chirps. The new system has been used to experimentally investigate the effects of tissue attenuation so that the design of the receive compression filter can be accordingly guided. Tests made with different chirp signals confirm that, although the attainable compression gain in attenuating media is lower than the theoretical value expected for a given TX Time-Bandwidth product (BT), good SNR gains can be obtained. For example, by using a chirp signal having BT=19, a 13 dB compression gain has been measured. By adapting the frequency band of the receiver to the band of the received echo, the signal-to-noise ratio and the penetration depth have been further increased, as shown by real-time tests conducted on phantoms and in vivo. In particular, a 2.7 dB SNR increase has been measured through a novel attenuation compensation scheme, which only requires to shift the demodulation frequency by 1 MHz. The proposed method characterizes for its simplicity and easy implementation.
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Affiliation(s)
- A Ramalli
- Department of Information Engineering, Università degli Studi di Firenze, Florence, Italy.
| | - F Guidi
- Department of Information Engineering, Università degli Studi di Firenze, Florence, Italy
| | - E Boni
- Department of Information Engineering, Università degli Studi di Firenze, Florence, Italy
| | - P Tortoli
- Department of Information Engineering, Università degli Studi di Firenze, Florence, Italy
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Fukuyama A, Takeuchi M, Wu V, Nagata Y, Hayashi A, Otani K, Fukuda S, Yoshitani H, Lin F, Otsuji Y, Islas F, Olmos C, Almeria C, Rodrigo J, De Agustin A, Marcos-Alberca P, Clavero M, Saltijeral A, Perez De Isla L, Atout W, Maceira Gonzalez AM, Igual B, Cosin-Sales J, Diago J, Aguilar J, Ruvira J, Sotillo J, Bertella E, Baggiano A, Loguercio M, Mushtaq S, Petulla' M, Segurini C, Conte E, Andreini D, Pontone G, Tong L, Ramalli A, Tortoli P, Luo J, D'hooge J, Galanti G, Toncelli L, Stefani L, Pedri S, Pedrizzetti G, Kaminska-Kegel A, Jaroch J, Brzezinska B, Kruszynska E, Kusmierz M, Loboz-Grudzien K, Hagendorff A, Stoebe S, Tarr A, Pfeiffer D, Fazlinezhad A, Fazlinezhad A, Azimi S, Vejdan Parast M, Hashemi Doost A. MODERATED POSTER SESSION: New imaging techniques in classical scenarios: Saturday 6 December 2014, 08:30-12:30 * Location: Moderated Poster area. Eur Heart J Cardiovasc Imaging 2014. [DOI: 10.1093/ehjci/jeu266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Tong L, Huang C, Ramalli A, Tortoli P, Luo J, D'hooge J, Tzemos N, Mordi I, Bishay T, Bishay T, Negishi T, Hristova K, Kurosawa K, Bansal M, Thavendiranathan P, Yuda S, Popescu B, Vinereanu D, Penicka M, Marwick T, Hamed W, Kamel M, Yaseen R, El-Barbary H, Nemes A, Kis O, Gavaller H, Kanyo E, Forster T, Angelis A, Vlachopoulos C, Ioakimidis N, Felekos I, Chrysohoou C, Aznaouridis K, Abdelrasoul M, Terentes D, Ageli K, Stefanadis C, Kurnicka K, Domienik-Karlowicz J, Lichodziejewska B, Goliszek S, Grudzka K, Krupa M, Dzikowska-Diduch O, Ciurzynski M, Pruszczyk P, Gual Capllonch F, Lopez Ayerbe J, Teis A, Ferrer E, Vallejo N, Junca G, Pla R, Bayes-Genis A, Schwaiger J, Knight D, Gallimore A, Schreiber B, Handler C, Coghlan J, Bruno RM, Giardini G, Malacrida S, Catuzzo B, Armenia S, Brustia R, Ghiadoni L, Cauchy E, Pratali L, Kim K, Lee K, Cho J, Yoon H, Ahn Y, Jeong M, Cho J, Park J, Cho S, Nastase O, Enache R, Mateescu A, Botezatu D, Popescu B, Ginghina C, Gu H, Sinha M, Simpson J, Chowienczyk P, Fazlinezhad A, Tashakori Behesthi A, Homaei F, Mostafavi H, Hosseini G, Bakaeiyan M, Boutsikou M, Petrou E, Dimopoulos A, Dritsas A, Leontiadis E, Karatasakis G, Sahin ST, Yurdakul S, Yilmaz N, Cengiz B, Cagatay Y, Aytekin S, Yavuz S, Karlsen S, Dahlslett T, Grenne B, Sjoli B, Smiseth O, Edvardsen T, Brunvand H, Nasr G, Nasr A, Eleraki A, Elrefai S, Mordi I, Sonecki P, Tzemos N, Gustafsson U, Naar J, Stahlberg M, Cerne A, Capotosto L, Rosato E, D'angeli I, Azzano A, Truscelli G, De Maio M, Salsano F, Terzano C, Mangieri E, Vitarelli A, Renard S, Najih H, Mancini J, Jacquier A, Haentjens J, Gaubert J, Habib G, Caminiti G, D'antoni V, D'antoni V, Cardaci V, Cardaci V, Conti V, Conti V, Volterrani M, Volterrani M, Ahn J, Kim D, Lee H, Iliuta L, Lo Iudice F, Esposito R, Lembo M, Santoro C, Ballo P, Mondillo S, De Simone G, Galderisi M, Hwang Y, Kim J, Kim J, Moon K, Yoo K, Kim C, Tagliamonte E, Rigo F, Cirillo T, Caruso A, Astarita C, Cice G, Quaranta G, Romano C, Capuano N, Calabro' R, Zagatina A, Zhuravskaya N, Guseva O, Huttin O, Benichou M, Voilliot D, Venner C, Micard E, Girerd N, Sadoul N, Moulin F, Juilliere Y, Selton-Suty C, Baron T, Christersson C, Johansson K, Flachskampf F, Lee S, Lee J, Hur S, Park J, Yun J, Song S, Kim W, Ko J, Nyktari E, Bilal S, Ali S, Izgi C, Prasad S, Aly M, Kleijn S, Kandil H, Kamp O, Beladan C, Calin A, Rosca M, Craciun A, Gurzun M, Calin C, Enache R, Mateescu A, Ginghina C, Popescu B, Mornos C, Mornos A, Ionac A, Cozma D, Crisan S, Popescu I, Ionescu G, Petrescu L, Camacho S, Gamaza Chulian S, Carmona R, Diaz E, Giraldez A, Gutierrez A, Toro R, Benezet J, Antonini-Canterin F, Vriz O, La Carrubba S, Poli S, Leiballi E, Zito C, Careri S, Caruso R, Pellegrinet M, Nicolosi G, Kong W, Kyu K, Wong R, Tay E, Yip J, Yeo T, Poh K, Correia M, Delgado A, Marmelo B, Correia E, Abreu L, Cabral C, Gama P, Santos O, Rahman M, Borges IP, Peixoto E, Peixoto R, Peixoto R, Marcolla V, Okura H, Kanai M, Murata E, Kataoka T, Stoebe S, Tarr A, Pfeiffer D, Hagendorff A, Generati G, Bandera F, Pellegrino M, Alfonzetti E, Labate V, Guazzi M, Kuznetsov V, Yaroslavskaya E, Pushkarev G, Krinochkin D, Zyrianov I, Carigi S, Baldazzi F, Bologna F, Amati S, Venturi P, Grosseto D, Biagetti C, Fabbri E, Arlotti M, Piovaccari G, Rahbi H, Bin Abdulhaq A, Tleyjeh I, Santoro C, Galderisi M, Costantino M, Tarsia G, Innelli P, Dores E, Esposito G, Matera A, De Simone G, Trimarco B, Capotosto L, Azzano A, Mukred K, Ashurov R, Tanzilli G, Mangieri E, Vitarelli A, Merlo M, Gigli M, Stolfo D, Pinamonti B, Antonini Canterin F, Muca M, D'angelo G, Scapol S, Di Nucci M, Sinagra G, Behaghel A, Feneon D, Fournet M, Thebault C, Martins R, Mabo P, Leclercq C, Daubert C, Donal E, Davinder Pal S, Prakash Chand N, Sanjeev A, Rajeev M, Ankur D, Ram Gopal S, Mzoughi K, Zairi I, Jabeur M, Ben Moussa F, Ben Chaabene A, Kamoun S, Mrabet K, Fennira S, Zargouni A, Kraiem S, Demkina A, Hashieva F, Krylova N, Kovalevskaya E, Potehkina N, Zaroui A, Ben Said R, Smaali S, Rekik B, Ben Hlima M, Mizouni H, Mechmeche R, Mourali M, Malhotra A, Sheikh N, Dhutia H, Siva A, Narain R, Merghani A, Millar L, Walker M, Sharma S, Papadakis M, Siam-Tsieu V, Mansencal N, Arslan M, Deblaise J, Dubourg O, Zaroui A, Rekik B, Ben Said R, Boudiche S, Larbi N, Tababi N, Hannachi S, Mechmeche R, Mourali M, Mechmeche R, Zaroui A, Chalbia T, Ben Halima M, Rekik B, Boussada R, Mourali M, Lipari P, Bonapace S, Valbusa F, Rossi A, Zenari L, Lanzoni L, Targher G, Canali G, Molon G, Barbieri E, Novo G, Giambanco S, Sutera M, Bonomo V, Giambanco F, Rotolo A, Evola S, Assennato P, Novo S, Budnik M, Piatkowski R, Kochanowski J, Opolski G, Chatzistamatiou E, Mpampatseva Vagena I, Manakos K, Moustakas G, Konstantinidis D, Memo G, Mitsakis O, Kasakogias A, Syros P, Kallikazaros I, Marketou M, Parthenakis F, Kalyva N, Pontikoglou C, Maragkoudakis S, Zacharis E, Patrianakos A, Maragoudakis F, Papadaki H, Vardas P, Rodrigues A, Perandini L, Souza T, Sa-Pinto A, Borba E, Arruda A, Furtado M, Carvalho F, Bonfa E, Andrade J, Hlubocka Z, Malinova V, Palecek T, Danzig V, Kuchynka P, Dostalova G, Zeman J, Linhart A, Chatzistamatiou E, Konstantinidis D, Memo G, Mpampatzeva Vagena I, Moustakas G, Manakos K, Trachanas K, Vergi N, Feretou A, Kallikazaros I, Corut H, Sade L, Ozin B, Atar I, Turgay O, Muderrisoglu H, Ledakowicz-Polak A, Polak L, Krauza G, Zielinska M, Szulik M, Streb W, Wozniak A, Lenarczyk R, Sliwinska A, Kalarus Z, Kukulski T, Nogueira M, Branco L, Agapito A, Galrinho A, Borba A, Teixeira P, Monteiro A, Ramos R, Cacela D, Cruz Ferreira R, Guala A, Camporeale C, Tosello F, Canuto C, Ridolfi L, Chatzistamatiou E, Moustakas G, Memo G, Konstantinidis D, Mpampatzeva Vagena I, Manakos K, Traxanas K, Vergi N, Feretou A, Kallikazaros I, Hristova K, Marinov R, Stamenov G, Mihova M, Persenska S, Racheva A, Plaskota K, Trojnarska O, Bartczak A, Grajek S, Ramush Bejiqi R, Retkoceri R, Bejiqi H, Beha A, Surdulli S, Dreyfus J, Durand-Viel G, Cimadevilla C, Brochet E, Vahanian A, Messika-Zeitoun D, Jin C, Fang F, Meng F, Kam K, Sun J, Tsui G, Wong K, Wan S, Yu C, Lee A, Cho IJ, Chung H, Heo R, Ha S, Hong G, Shim C, Chang H, Ha J, Chung N, Moral S, Gruosso D, Galuppo V, Teixido G, Rodriguez-Palomares J, Gutierrez L, Evangelista A, Moral S, Gruosso D, Galuppo V, Teixido G, Rodriguez-Palomares J, Gutierrez L, Evangelista A, Moral S, Gruosso D, Galuppo V, Teixido G, Rodriguez-Palomares J, Gutierrez L, Evangelista A, Alexopoulos A, Dawson D, Nihoyannopoulos P, Zainal Abidin HA, Ismail J, Arshad K, Ibrahim Z, Lim C, Abd Rahman E, Kasim S, Peteiro J, Barrio A, Escudero A, Bouzas-Mosquera A, Yanez J, Martinez D, Castro-Beiras A, Scali M, Simioniuc A, Mandoli G, Lombardo A, Massaro F, Di Bello V, Marzilli M, Dini F, Adachi H, Tomono J, Oshima S, Merchan Ortega G, Bravo Bustos D, Lazaro Garcia R, Sanchez Espino A, Macancela Quinones J, Ikuta I, Ruiz Lopez M, Valencia Serrano F, Bonaque Gonzalez J, Gomez Recio M, Romano G, D'ancona G, Pilato G, Di Gesaro G, Clemenza F, Raffa G, Scardulla C, Sciacca S, Lancellotti P, Pilato M, Addetia K, Takeuchi M, Maffessanti F, Weinert L, Hamilton J, Mor-Avi V, Lang R, Sugano A, Seo Y, Watabe H, Kakefuda Y, Aihara H, Nishina H, Ishizu T, Fumikura Y, Noguchi Y, Aonuma K, Luo X, Fang F, Lee A, Shang Q, Yu C, Sammut EC, Chabinok R, Jackson T, Siarkos M, Lee L, Carr-White G, Rajani R, Kapetanakis S, Byrne D, Walsh J, Ellis L, Mckiernan S, Norris S, King G, Murphy R, Hristova K, Katova T, Simova I, Kostova V, Shuie I, Ferferieva V, Bogdanova V, Castelon X, Nemes A, Sasi V, Domsik P, Kalapos A, Lengyel C, Orosz A, Forster T, Grapsa J, Demir O, Dawson D, Sharma R, Senior R, Nihoyannopoulos P, Pilichowska E, Zaborska B, Baran J, Stec S, Kulakowski P, Budaj A, Kosmala W, Kaye G, Saito M, Negishi K, Marwick T, Maceira Gonzalez AM, Ripoll C, Cosin-Sales J, Igual B, Salazar J, Belloch V, Dulai RS, Taylor A, Gupta S. Poster session 1: Wednesday 3 December 2014, 09:00-16:00 * Location: Poster area. Eur Heart J Cardiovasc Imaging 2014; 15:ii25-ii51. [DOI: 10.1093/ehjci/jeu248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 09/02/2023] Open
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Bertrand P, Grieten L, Smeets C, Verbrugge F, Mullens W, Vrolix M, Rivero-Ayerza M, Verhaert D, Vandervoort P, Tong L, Ramalli A, Tortoli P, D'hoge J, Bajraktari G, Lindqvist P, Henein M, Obremska M, Boratynska M, Kurcz J, Zysko D, Baran T, Klinger M, Darahim K, Mueller H, Carballo D, Popova N, Vallee JP, Floria M, Chistol R, Tinica G, Grecu M, Rodriguez Serrano M, Osa-Saez A, Rueda-Soriano J, Buendia-Fuentes F, Domingo-Valero D, Igual-Munoz B, Alonso-Fernandez P, Quesada-Carmona A, Miro-Palau V, Palencia-Perez M, Bech-Hanssen O, Polte C, Lagerstrand K, Janulewicz M, Gao S, Erdogan E, Akkaya M, Bacaksiz A, Tasal A, Sonmez O, Turfan M, Kul S, Vatankulu M, Uyarel H, Goktekin O, Mincu R, Magda L, Mihaila S, Florescu M, Mihalcea D, Enescu O, Chiru A, Popescu B, Tiu C, Vinereanu D, Broch K, Kunszt G, Massey R, De Marchi S, Aakhus S, Gullestad L, Urheim S, Yuan L, Feng J, Jin X, Bombardini T, Casartelli M, Simon D, Gaspari M, Procaccio F, Hasselberg N, Haugaa K, Brunet A, Kongsgaard E, Donal E, Edvardsen T, Sahin T, Yurdakul S, Cengiz B, Bozkurt A, Aytekin S, Cesana F, Spano' F, Santambrogio G, Alloni M, Vallerio P, Salvetti M, Carerj S, Gaibazzi N, Rigo F, Moreo A, Wdowiak-Okrojek K, Michalski B, Kasprzak J, Shim A, Lipiec P, Generati G, Pellegrino M, Bandera F, Donghi V, Alfonzetti E, Guazzi M, Marcun R, Stankovic I, Farkas J, Vlahovic-Stipac A, Putnikovic B, Kadivec S, Kosnik M, Neskovic A, Lainscak M, Iliuta L, Szymanski P, Lipczynska M, Klisiewicz A, Sobieszczanska-Malek M, Zielinski T, Hoffman P, Gjerdalen GF, Hisdal J, Solberg E, Andersen T, Radunovic Z, Steine K, Svanadze A, Poteshkina N, Krylova N, Mogutova P, Shim A, Kasprzak J, Szymczyk E, Wdowiak-Okrojek K, Michalski B, Stefanczyk L, Lipiec P, Benedek T, Matei C, Jako B, Suciu Z, Benedek I, Yaroshchuk NA, Kochmasheva VV, Dityatev VP, Kerbikov OB, Przewlocka-Kosmala M, Orda A, Karolko B, Mysiak A, Kosmala W, Rechcinski T, Wierzbowska-Drabik K, Lipiec P, Chmiela M, Kasprzak J, Aziz A, Hooper J, Rayasamudra S, Uppal H, Asghar O, Potluri R, Zaroui A, Mourali M, Rezine Z, Mbarki S, Jemaa M, Aloui H, Mechmeche R, Farhati A, Gripari P, Maffessanti F, Tamborini G, Muratori M, Fusini L, Vignati C, Bartorelli A, Alamanni F, Agostoni P, Pepi M, Ruiz Ortiz M, Mesa D, Delgado M, Seoane T, Carrasco F, Martin M, Mazuelos F, Suarez De Lezo Herreros De Tejada J, Romero M, Suarez De Lezo J, Brili S, Stamatopoulos I, Misailidou M, Chrisochoou C, Christoforatou E, Stefanadis C, Ruiz Ortiz M, Mesa D, Delgado M, Martin M, Seoane T, Carrasco F, Ojeda S, Segura J, Pan M, Suarez De Lezo J, Cammalleri V, Ussia G, Muscoli S, Marchei M, Sergi D, Mazzotta E, Romeo F, Igual Munoz B, Bel Minguez A, Perez Guillen M, Maceira Gonzalez A, Monmeneu Menadas J, Hernandez Acuna C, Estornell Erill J, Lopez Lereu P, Francisco Jose Valera Martinez F, Montero Argudo A, Sunbul M, Akhundova A, Sari I, Erdogan O, Mutlu B, Cacicedo A, Velasco Del Castillo S, Anton Ladislao A, Aguirre Larracoechea U, Rodriguez Sanchez I, Subinas Elorriaga A, Oria Gonzalez G, Onaindia Gandarias J, Laraudogoitia Zaldumbide E, Lekuona Goya I, Ding W, Zhao Y, Lindqvist P, Nilson J, Winter R, Holmgren A, Ruck A, Henein M, Attenhofer Jost CH, Soyka R, Oxenius A, Kretschmar O, Valsangiacomo Buechel E, Greutmann M, Weber R, Keramida K, Kouris N, Kostopoulos V, Karidas V, Damaskos D, Makavos G, Paraskevopoulos K, Olympios C, Eskesen K, Olsen N, Fritz-Hansen T, Sogaard P, Cameli M, Lisi M, Righini F, Curci V, Massoni A, Natali B, Maccherini M, Chiavarelli M, Massetti M, Mondillo S, Mabrouk Salem Omar A, Ahmed Abdel-Rahman M, Khorshid H, Rifaie O, Santoro C, Santoro A, Ippolito R, De Palma D, De Stefano F, Muscariiello R, Galderisi M, Squeri A, Censi S, Baldelli M, Grattoni C, Cremonesi A, Bosi S, Saura Espin D, Gonzalez Canovas C, Gonzalez Carrillo J, Oliva Sandoval M, Caballero Jimenez L, Espinosa Garcia M, Garcia Navarro M, Valdes Chavarri M, De La Morena Valenzuela G, Ryu S, Shin D, Son J, Choi J, Goh C, Choi J, Park J, Hong G, Sklyanna O, Yuan L, Yuan L, Planinc I, Bagadur G, Ljubas J, Baricevic Z, Skoric B, Velagic V, Bijnens B, Milicic D, Cikes M, Gospodinova M, Chamova T, Guergueltcheva V, Ivanova R, Tournev I, Denchev S, Ancona R, Comenale Pinto S, Caso P, Arenga F, Coppola M, Calabro R, Neametalla H, Boitard S, Hamdi H, Planat-Benard V, Casteilla L, Li Z, Hagege A, Mericskay M, Menasche P, Agbulut O, Merlo M, Stolfo D, Anzini M, Negri F, Pinamonti B, Barbati G, Di Lenarda A, Sinagra G, Stolfo D, Merlo M, Pinamonti B, Gigli M, Poli S, Porto A, Di Nora C, Barbati G, Di Lenarda A, Sinagra G, Coppola C, Piscopo G, Cipresso C, Rea D, Maurea C, Esposito E, Arra C, Maurea N, Nemes A, Kalapos A, Domsik P, Forster T, Voilliot D, Huttin O, Vaugrenard T, Schwartz J, Sellal JM, Aliot E, Juilliere Y, Selton-Suty C, Sanchez Millan PJ, Cabeza Lainez P, Castillo Ortiz J, Chueca Gonzalez E, Gheorghe L, Fernandez Garcia P, Herruzo Rojas M, Del Pozo Contreras R, Fernandez Garcia M, Vazquez Garcia R, Rosca M, Popescu B, Botezatu D, Calin A, Beladan C, Gurzun M, Enache R, Ginghina C, Farouk H, Al-Maimoony T, Alhadad A, El Serafi M, Abdel Ghany M, Poorzand H, Mirfeizi S, Javanbakht A, Tellatin S, Famoso G, Dassie F, Martini C, Osto E, Maffei P, Iliceto S, Tona F, Radunovic Z, Steine K, Jedrzejewska I, Braksator W, Krol W, Swiatowiec A, Sawicki J, Kostarska-Srokosz E, Dluzniewski M, Maceira Gonzalez AM, Cosin-Sales J, Diago J, Aguilar J, Ruvira J, Monmeneu J, Igual B, Lopez-Lereu M, Estornell J, Olszanecka A, Dragan A, Kawecka-Jaszcz K, Czarnecka D, Scholz F, Gaudron P, Hu K, Liu D, Florescu C, Herrmann S, Bijnens B, Ertl G, Stoerk S, Weidemann F, Krestjyaninov M, Razin V, Gimaev R, Bogdanovic Z, Burazor I, Deljanin Ilic M, Peluso D, Muraru D, Cucchini U, Mihaila S, Casablanca S, Pigatto E, Cozzi F, Punzi L, Badano L, Iliceto S, Zhdanova E, Rameev V, Safarova A, Moisseyev S, Kobalava Z, Magnino C, Omede' P, Avenatti E, Presutti D, Losano I, Moretti C, Bucca C, Gaita F, Veglio F, Milan A, Bellsham-Revell H, Bell A, Miller O, Simpson J, Hwang Y, Kim G, Jung M, Woo G, Driessen M, Leiner T, Schoof P, Breur J, Sieswerda G, Meijboom F, Bellsham-Revell H, Hayes N, Anderson D, Austin B, Razavi R, Greil G, Simpson J, Bell A, Zhao X, Xu X, Qin Y, Szmigielski CA, Styczynski G, Sobczynska M, Placha G, Kuch-Wocial A, Ikonomidis I, Voumbourakis A, Triantafyllidi H, Pavlidis G, Varoudi M, Papadakis I, Trivilou P, Paraskevaidis I, Anastasiou-Nana M, Lekakis I, Kong W, Yip J, Ling L, Milan A, Tosello F, Leone D, Bruno G, Losano I, Avenatti E, Sabia L, Veglio F, Zaborska B, Baran J, Pilichowska-Paszkiet E, Sikora-Frac M, Michalowska I, Kulakowski P, Budaj A, Mega S, Bono M, De Francesco V, Castiglione I, Ranocchi F, Casacalenda A, Goffredo C, Patti G, Di Sciascio G, Musumeci F, Kennedy M, Waterhouse D, Sheahan R, Foley D, Mcadam B, Ancona R, Comenale Pinto S, Caso P, Arenga F, Coppola M, Calabro R, Remme EW, Smedsrud MK, Hasselberg NE, Smiseth OA, Edvardsen T, Halmai L, Nemes A, Kardos A, Neubauer S, Degiovanni A, Baduena L, Dell'era G, Occhetta E, Marino P, Hotchi J, Yamada H, Nishio S, Bando M, Hayashi S, Hirata Y, Amano R, Soeki T, Wakatsuki T, Sata M, Lamia B, Molano L, Viacroze C, Cuvelier A, Muir J, Lipczynska M, Piotr Szymanski P, Anna Klisiewicz A, Lukasz Mazurkiewicz L, Piotr Hoffman P, Van 'T Sant J, Wijers S, Ter Horst I, Leenders G, Cramer M, Doevendans P, Meine M, Hatam N, Goetzenich A, Aljalloud A, Mischke K, Hoffmann R, Autschbach R, Sikora-Frac M, Zaborska B, Maciejewski P, Bednarz B, Budaj A, Evangelista A, Torromeo C, Pandian N, Nardinocchi P, Varano V, Schiariti M, Teresi L, Puddu P, Storve S, Dalen H, Snare S, Haugen B, Torp H, Fehri W, Mahfoudhi H, Mezni F, Annabi M, Taamallah K, Dahmani R, Haggui A, Hajlaoui N, Lahidheb D, Haouala H, Colombo A, Carminati M, Maffessanti F, Gripari P, Pepi M, Lang R, Caiani E, Walker J, Abadi S, Agmon Y, Carasso S, Aronson D, Mutlak D, Lessick J, Saxena A, Ramakrishnan S, Juneja R, Ljubas J, Reskovic Luksic V, Matasic R, Pezo Nikolic B, Lovric D, Separovic Hanzevacki J, Quattrone A, Zito C, Alongi G, Vizzari G, Bitto A, De Caridi G, Greco M, Tripodi R, Pizzino G, Carerj S, Ibrahimi P, Jashari F, Johansson E, Gronlund C, Bajraktari G, Wester P, Henein M, Kosmala W, Marwick T, Souza JRM, Zacharias LGT, Geloneze B, Pareja JC, Chaim A, Nadruz WJ, Coelho OR, Apostolovic S, Stanojevic D, Jankovic-Tomasevic R, Salinger-Martinovic S, Djordjevic-Radojkovic D, Pavlovic M, Tahirovic E, Musial-Bright L, Lainscak M, Duengen H, Filipiak D, Kasprzak J, Lipiec P. Poster session Wednesday 11 December all day display: 11/12/2013, 09:30-16:00 * Location: Poster area. Eur Heart J Cardiovasc Imaging 2013. [DOI: 10.1093/ehjci/jet202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Ahlgren A, Steen S, Segstedt S, Nilsson T, Lindström K, Sjöberg T, Persson H, Ricci S, Tortoli P, Cinthio M. P6.16 PRONOUNCED INCREASE IN LONGITUDINAL DISPLACEMENT OF THE PORCINE CAROTID ARTERY WALL CAN TAKE PLACE INDEPENDENTLY OF WALL SHEAR RATE. Artery Res 2013. [DOI: 10.1016/j.artres.2013.10.197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Forzoni L, Righi D, Ciuti G, Morovic S, Zavoreo I, Mecacci F, Bussadori C, Tortoli P. Multigate Quality Doppler Profiles Technology in Vascular, Obstetrics and Cardiology Applications. BIOMED ENG-BIOMED TE 2012. [DOI: 10.1515/bmt-2012-4270] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
| | - D. Righi
- Angiology Department, Azienda Ospedaliero-Universitaria Careggi, Firenze, Italy
| | - G. Ciuti
- Medical and Surgical Critical Care Department, Azienda Ospedaliero-Universitaria Careggi, Florence, Italy
| | - S. Morovic
- Neurology Department, University Hospital Center Sestre Milosrdnice, Zagreb, Croatia
| | - I. Zavoreo
- Neurology Department, University Hospital Center Sestre Milosrdnice, Zagreb, Croatia
| | - F. Mecacci
- Obstetrics and Gynecology 2 Department, Azienda Ospedaliero-Universitaria Careggi, Firenze, Italy
| | - C. Bussadori
- Pediatric Cardiology Department, IRCCS Policlinico San Donato, San Donato Milanese, Milano, Italy
| | - P. Tortoli
- Microelectronics Systems Design Laboratory, Università degli Studi di Firenze, Firenze, Italy
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Bini G, Francalanci L, Ghiadoni L, Dallai A, Tortoli P, Palombo C. 6.4 SIMULTANEOUS MEASUREMENT OF WALL SHEAR RATE AND ARTERIAL DISTENSION IN FMD STUDIES BY MEANS OF A MULTIGATE DOPPLER SPECTRAL APPROACH. Artery Res 2010. [DOI: 10.1016/j.artres.2010.10.181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Bassi L, Boni E, Dallai A, Guidi F, Ricci S, Tortoli P. 8A-2 ULA-OP: A Novel ULtrasound Advanced Open Platform for Experimental Research. ACTA ACUST UNITED AC 2007. [DOI: 10.1109/ultsym.2007.164] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Urban G, Paidas M, Sanguineti F, Ricci S, Tortoli P, Patrizio P. Rheological study of ovarian cycle in donors and recipients of oocyte donation using a novel multigate spectral doppler analysis (MSDA). Fertil Steril 2007. [DOI: 10.1016/j.fertnstert.2007.07.270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Malshi E, Dallai A, Morganti T, Bambi G, Kozàkovà M, Ricci S, Morizzo C, Tortoli P. P.080 AGE-RELATED CAROTID REMODELING AND WALL SHEAR RATE: INSIGHTS FROM A NOVEL MULTIGATE DOPPLER SYSTEM FOR INTEGRATED EVALUATION OF FLOW VELOCITY PROFILE AND DIAMETERS. Artery Res 2007. [DOI: 10.1016/j.artres.2007.07.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Urban G, Ricci S, Guidi F, Bambi G, Tortoli P, Paidas MJ. Real-time human fetal aorta velocity profile using global acquisition and signal processing (GASP). Ultrasound Obstet Gynecol 2006; 27:716-8. [PMID: 16628612 DOI: 10.1002/uog.2753] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Affiliation(s)
- G Urban
- Universita di Milano Bicocca, Department of Obstetrics and Gynecology, Monza, Italy.
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Krams R, Bambi G, Guidi F, Helderman F, van der Steen AFW, Tortoli P. Effect of vessel curvature on Doppler derived velocity profiles and fluid flow. Ultrasound Med Biol 2005; 31:663-71. [PMID: 15866416 DOI: 10.1016/j.ultrasmedbio.2005.01.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2004] [Revised: 01/20/2005] [Accepted: 01/27/2005] [Indexed: 05/02/2023]
Abstract
Side-branches and curvatures in the arterial tree yield deviations from the axial oriented velocity. Velocity or volume flow estimates based on the assumption that flow is axially oriented are of limited value at these sites. This article evaluates information obtainable by using a multigate Doppler ultrasound (US) instrument used with curved phantoms, which resemble the human coronary arteries. The comparison of experimental velocity data with data provided by an accurate computational fluid dynamics (CFD) method shows differences in the range of 4 to 11% for four curvatures with different radii. Multigate data are also used to estimate the volume flow in the curved segments at different experimental conditions. An error lower than 15% is obtained, to be compared with a 24% error obtained by assuming a parabolic velocity profile. In particular, it is shown that the residual error is not related to the small deviation of the velocity vectors from the axial direction due to the presence of secondary velocity components, which are found to be of magnitude less than 10% with respect to the axial velocity component.
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Affiliation(s)
- R Krams
- Department of Biomedical Engineering, Erasmus MC, Erasmus University Rotterdam, PO Box 1738, 3000 DR Rotterdam, The Netherlands.
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Bambi G, Morganti T, Ricci S, Boni E, Guidi F, Palombo C, Tortoli P. A novel ultrasound instrument for investigation of arterial mechanics. Ultrasonics 2004; 42:731-737. [PMID: 15047375 DOI: 10.1016/j.ultras.2003.11.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The study of arterial mechanics concerns functional characteristics depending on wall elasticity and flow profile. Wall elasticity can be investigated through the estimation of parameters like the arterial distensibility, which is of high clinical interest because of its known correlation not only with the advanced atherosclerotic disease, but also with aging and major risk factors for cardiovascular disease. The flow velocity profile is also clinically relevant, because it modulates endothelial function and can be responsible for the development and distribution of atherosclerotic plaques. A clinically relevant variable extracted from the blood velocity profile is the wall shear rate (WSR), which represents the spatial velocity gradient near the vessel wall. This paper describes an integrated ultrasound system, capable of detecting both the velocity profile and the wall movements in human arteries. It basically consists of a PC add-on board including a single high-speed digital signal processor. This is dedicated to the analysis of echo-signals backscattered from 128 range cells located along the axis of the interrogating ultrasound (US) beam. Echoes generated from the walls (characterized by high amplitudes and low Doppler frequencies) and from red blood cells (characterized by low amplitudes and relatively high Doppler frequencies) are independently processed in real-time. Wall velocity is detected through the autocorrelation algorithm, while blood velocity is investigated through a complete spectral analysis of all signals backscattered by erythrocytes and WSR is extracted from the estimated velocity profile. Preliminary applications of the new system, including the simultaneous analysis of blood flow and arterial wall movement in healthy volunteers and in a diseased patient, are discussed, and first results are presented.
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Affiliation(s)
- G Bambi
- Department of Electronics and Telecommunications, University of Florence, Via Santa Marta 3, Firenze 50139, Italy
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Fan L, Evans DH, Naylor AR, Tortoli P. Real-time identification and archiving of micro-embolic Doppler signals using a knowledge-based DSP system. Med Biol Eng Comput 2004; 42:193-200. [PMID: 15125149 DOI: 10.1007/bf02344631] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Identification of micro-emboli in the cerebral circulation using transcranial Doppler ultrasound provides valuable clinical information, but, currently, embolic signal detection and analysis are significantly limited because they mainly rely on costly off-line analysis by human experts. In this study, a reliable, high-resolution, real-time automated system for the detection and archiving of embolic signals was designed and implemented using expert system theory and modern DSP technology. Preliminary tests were conducted to evaluate the functions and the performance of the system using data from ten carotid endarterectomy patients and two normal volunteers. Using the widely accepted 7 dB threshold for human reliability and a human expert, majority-decision gold standard, the real-time system reached sensitivity and specificity of 93.6% and 99.3%, respectively, which were close to the results obtained by three human experts under ideal laboratory conditions (90.1% and 99.8%, 98.4% and 99.9%, 98.9 and 99.9%). The new system has the potential to be used either as a bedside monitoring and signal acquisition device, or as a laboratory investigation tool.
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Affiliation(s)
- L Fan
- Department of Medical Physics, University Hospitals of Leicester NHS Trust, Leicester, UK
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Tortoli P, Michelassi V, Corsi M, Righi D, Takeuchi Y. On the interaction between ultrasound and contrast agents during Doppler investigations. Ultrasound Med Biol 2001; 27:1265-1273. [PMID: 11597368 DOI: 10.1016/s0301-5629(01)00426-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Knowledge of interaction mechanisms between ultrasound (US) and contrast agents (CA) suspended in blood is important for a correct interpretation of clinical investigation results. Experiments performed in different laboratories have shown that, as a consequence of primary radiation force, CA tend to move away from the US transducer. Accordingly, Doppler spectra produced by particles suspended in moving water turn out to be significantly altered from what is theoretically expected. The purpose of this paper is twofold. First, an original model describing the bubble dynamics as the outcome of the balance between US radiation force and fluid drag force is validated for the case in which bubbles are suspended in blood. The high fluid viscosity is shown to prevent significant bubble deviations from the unperturbed fluid streamlines so that, in large vessels, a residual spectral distortion may exist only at the highest intensity levels permitted by current regulations. Finally, the relative importance and differences between the effect of primary radiation force and streaming mechanisms that, in principle, could lead to similar effects, are discussed.
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Affiliation(s)
- P Tortoli
- Department of Electronics and Telecommunications, University of Florence, Florence, Italy.
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Tortoli P, Bettarini R, Guidi F, Andreuccetti F, Righi D. A simplified approach for real-time detection of arterial wall velocity and distension. IEEE Trans Ultrason Ferroelectr Freq Control 2001; 48:1005-1012. [PMID: 11477757 DOI: 10.1109/58.935717] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Arterial stiffness is known to increase with age and with many vascular diseases, but its noninvasive assessment in patients still represents a difficult task. The measurement of diameter change during the cardiac cycle (distension) has been proposed as a means to estimate arterial compliance and stiffness. Therefore, we have developed a simple PC-based device and algorithm for noninvasive quantification of vessel wall motion and diameter change in humans. This goal is achieved in real-time by processing the base-band signals from a commercial ultrasound Doppler system. Real-time operation is of crucial importance, because it allows a rapid achievement of optimal measurement conditions. The system was evaluated in a laboratory using a string phantom and was tested on the carotid arteries of 10 volunteers. Wall velocities from 0.05 to 600 mm/s and displacements lower than 2 microns were detected with phantoms. The measured carotid diameter change in the volunteers ranged from 7.5 to 11.8% (mean = 9.8%) and agrees closely with values reported in the literature. The difference between values taken one hour apart ranged from 0.2 to 0.5%. We conclude that the new system provides rapid, accurate, and repeatable measurements of vessel distension in humans.
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Affiliation(s)
- P Tortoli
- Electronics and Telecommunications Department, University of Florence, Italy.
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Abstract
The dependence of pulsed wave Doppler bandwidth on parameters typical of linear transducer arrays used in commercial Duplex and color flow mapping systems is investigated experimentally. For a single flow line it is observed that this bandwidth generally depends not only on the scatterer velocity and the beam-to-flow angle, but also on the flow line range and orientation. This is due to the fact that in Duplex and color flow systems the transducer is differently focused in the scan and elevation planes and its aperture and focal lengths are often made to vary, depending on the distance of the flow line from the transducer. It is however experimentally demonstrated that, at points where the ultrasound beamwidths in the scan and elevation planes are both comparable to the sample volume length, the Doppler bandwidth is independent of the beam-to-flow angle. It is also shown that this invariance can be extended to other ranges by appropriately modifying the array aperture. Finally, as an application of this independence, the flow-line velocity magnitude in these beam regions is estimated with better than 5% uncertainty through a simple bandwidth measurement.
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Affiliation(s)
- P Tortoli
- Electronics and Telecommunications Department, University of Florence, Italy.
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Abstract
Laboratory test objects are widely used in Doppler ultrasound (US). Although the acoustic properties of in vitro materials are usually known, they are unlikely to match each other, or their in vivo counterparts, exactly. We conducted theoretical and experimental studies of a focused ultrasound beam as it passes from one fluid, through an intervening plastic layer at an oblique angle, and then into a different fluid. Dual mode propagation may occur (i.e., both longitudinal and shear waves can propagate in the plastic layer). Our calculations show that the power transmitted by either mode drops very rapidly to zero at certain critical angles. A range of angles of incidence exists within a focused beam and this, combined with the highly angle-dependent power transmission behaviour, can produce major distortions of Doppler data. These may persist even when the beam axis is not oriented exactly at the critical angle. The total power transmitted depends on all the wave speeds, may involve mode conversion, and is a very complicated function of the angle of incidence. This study reports a practical method for the calculation of power transmission though a plastic layer, and shows how the resulting power vs. angle graph can be used to avoid artefacts in in vitro Doppler studies.
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Affiliation(s)
- R S Thompson
- School of Mathematics and Statistics, University of Sydney, Sydney, Australia.
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Abstract
Multigate analysis is known to be capable of detecting accurate blood velocity profiles from human vessels. Experimental systems so far presented in the literature use time-domain frequency estimations and, more recently, the fast Fourier transform (FFT) for real-time analysis of Doppler signals from multiple range cells. This experimental study is aimed at evaluating the application of an autoregressive (AR) method (Burg algorithm) to multigate Doppler analysis. Both in vitro and in vivo results were collected with a commercial Duplex scanner coupled with a prototype multigate unit developed in our laboratory. The same multigate signals are, thus, processed according to both the FFT and the Burg algorithms. The related spectral and maximum frequency profiles are reported and statistically compared. AR, implemented with the Burg algorithm, is demonstrated to be a way to perform multigate spectral analysis with reduced spectral variance, suitable for maximum velocity profile extraction through a simple threshold.
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Affiliation(s)
- G Guidi
- Electronic Engineering Department, University of Florence, Via S. Marta, 3, 50139, Florence, Italy.
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Tortoli P, Pratesi M, Michelassi V. Doppler spectra from contrast agents crossing an ultrasound field. IEEE Trans Ultrason Ferroelectr Freq Control 2000; 47:716-726. [PMID: 18238601 DOI: 10.1109/58.842061] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
When contrast agents are injected in a fluid, it is implicitly assumed that they move at the same velocity as the fluid itself. However, a series of in vitro tests performed by using air-filled microbubbles suspended in distilled water, have shown that the Doppler spectrum generated in this case may be notably different from that obtained from non-resonating scatterers. In this paper, we show, through a simple simulation model, that the actual movement of microbubbles may be predicted as the result of the complex balance between two forces: the ultrasound radiation force, which tends to move the particles along the sound beam direction, and the fluid drag force, which tends to move the particles along the fluid stream. The contrast agents turn out to be displaced only during the passage of the ultrasound burst; during the remaining time, they are maintained at the fluid velocity by the drag force. Based on the total particle displacement estimated between consecutive pulses, a series of Doppler spectra corresponding to different intensity levels was computed. This series was shown to be in excellent agreement with the experimental spectra obtained in vitro using Levovist (Schering AG, Berlin, Germany) particles suspended in distilled water flowing at a steady rate.
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Affiliation(s)
- P Tortoli
- Electronic Engineering Department, University of Florence, Italy.
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Tortoli P, Guidi G, Guidi F, Menicucci C, Atzeni C, Muchada R. Detection of vascular haemodynamics through a high-speed velocity profiler. Eur J Ultrasound 1999; 9:231-44. [PMID: 10657598 DOI: 10.1016/s0929-8266(99)00034-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
OBJECTIVE This paper aims at demonstrating that ultrasound Doppler multigate spectral analysis performed with advanced equipment may provide detailed and significant haemodynamic information. METHODS A novel multigate system was recently introduced and shown capable of performing real-time spectral analysis of Doppler data from 64 resolution cells located at different depths from the transducer. The system extends the typical capabilities of conventional Pulsed Wave (PW) equipment by displaying the full spectral content of Doppler signals over an ultrasound scan line rather than in a single resolution cell. In cases where it is appropriate to display the available information in a simpler form, parameters such as the maximum frequency can be extracted from each spectrum, by using conventional or advanced image processing methods. RESULTS In-vitro experiments show that the multigate system can perform velocity measurements with good accuracy and precision. Examples of in vivo profiles detected from carotid, femoral and radial arteries are presented. In particular, the first results obtained from the aorta are shown. CONCLUSIONS Blood flow behavior can be accurately investigated using a real-time multigate system which extends Doppler spectral analysis to a whole scan line.
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Affiliation(s)
- P Tortoli
- Electronic Engineering Department, University of Florence, via S. Marta 3, 50139, Florence, Italy.
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Maione E, Tortoli P, Lypacewicz G, Nowicki A, Reid JM. PSpice modelling of ultrasound transducers: comparison of software models to experiment. IEEE Trans Ultrason Ferroelectr Freq Control 1999; 46:399-406. [PMID: 18238437 DOI: 10.1109/58.753029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
This paper presents a complete PSpice model of an ultrasound single-element transducer, including electrical and mechanical matching as well as the focusing lens. By using this model, it is possible to obtain a relation between the electrical driving source and the acoustic velocity on the transducer surface. This boundary condition then allows the acoustic field to be calculated by numerical methods. Experimental data obtained with two different transducers are in good agreement with results predicted by the related models.
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Affiliation(s)
- E Maione
- Electronic Engineering Department, University of Florence, 50139 Firenze, Italy. tortoli@die .die.uni .it
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Tortoli P, Bagnai D, Righi D. Quantitative analysis of Doppler spectrum modifications yielded by contrast agents insonified at high pressure. IEEE Trans Ultrason Ferroelectr Freq Control 1999; 46:247-251. [PMID: 18238421 DOI: 10.1109/58.741543] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
In this report, the authors consider the modifications yielded in the Doppler spectrum when acoustic fields of increasing intensities are applied to encapsulated gas bubbles. Their in vitro experimental results show that the spectrum bandwidth is nearly proportional to the incident acoustic pressure, when its amplitude is maintained below about 200 kPa. At higher pressure levels, it even may happen that, in a steady, unidirectional flow (which should generate only positive Doppler frequencies), the Doppler spectrum is enlarged up to the point that negative Doppler shifts also are produced. Possible explanations in terms of either radiation force or streaming are discussed for this asymmetrical bandwidth enlargement.
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Tortoli P, Thompson RS, Berti P, Guidi F. Flow imaging with pulsed Doppler ultrasound and flow phantoms. IEEE Trans Ultrason Ferroelectr Freq Control 1999; 46:1591-1596. [PMID: 18244358 DOI: 10.1109/58.808885] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The use of a multigate profiling system with steady laminar flow in plastic tubes revealed spectral artifacts not previously described. In particular, a double or split profile was often observed. In this paper, these artifacts are related to the dual mode ultrasound propagation in the plastic tube. The propagation speeds and, therefore, refraction angles and propagation paths are different for the longitudinal and the shear wave. The power transmission can be extraordinarily sensitive to small variations in the angle of incidence, and this may combine with the existence of a range of angles of incidence within any focused ultrasound beam to produce spectral distortions. The plastic tube is thus shown equivalent to a selective filter, which diminishes some frequency components in the Doppler spectrum relative to others. The spectral artifacts are explained in terms of the relative power transmitted by each mode, and the degree of beam defocusing experienced by each. Spectral distortions persist even when the beam-to-flow orientation is well away from the critical angle. The results of this study show that it is feasible to understand the acoustic transmission behavior of a flow phantom, based on a knowledge of the material properties, and to demonstrate the usefulness of doing so.
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Affiliation(s)
- P Tortoli
- Dept. of Electron. Eng., Florence Univ
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Muchada R, Tortoli P, Guidi F, Lavandier B, Cathignol D. Towards an absolute measurement of the aortic blood flow in anaesthesia and intensive care. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0929-8266(97)80165-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Abstract
Pulsed Doppler spectral analysis is a well-established diagnostic technique in the assessment of arterial diseases. Because of hardware limitations, its use has been so far restricted to the analysis of a single sample volume located along the ultrasound beam axis. In this paper, we discuss the operation of a newly developed multigate instrument capable of performing, in real time, 64-point fast Fourier transforms of Doppler signals sampled from 64 different range cells. The new instrument is capable of accurately detecting the actual blood flow behavior in major human vessels. Significant examples of velocity profiles obtained in real time from carotid arteries in healthy subjects are reproduced here for the first time. Multigate extension of spectral analysis is demonstrated to be a suitable means for detailed in vivo investigation of blood flow dynamics.
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Affiliation(s)
- P Tortoli
- Electronic Engineering Department, University of Florence, Italy
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43
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Abstract
In vessels whose diameter is smaller than the length of the range cell or measurement volume, the maximum blood velocity is often calculated from the maximum frequency of the Doppler spectrum, using the classical Doppler equation. It is shown that the accuracy of this procedure is significantly improved at large beam-to-flow angles, if a correction for transit time broadening is made. This finding is based on the demonstration that the maximum frequency of the Doppler spectrum depends only on the maximum velocity passing through the measurement volume, but in a manner which is a function both of the Doppler shift frequency as well as the transit time broadening associated with the passage of scatterers through the beam width.
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Affiliation(s)
- P Tortoli
- Electronic Engineering Department, University of Florence, Italy
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Abstract
When measuring flow velocity using the conventional ultrasonic Doppler effect, beam axis-to-flow angles approaching 90 degrees are avoided as the Doppler spectrum frequency shift is known to go to zero at this angle. In this paper, the conventional Doppler technique is compared with the transverse Doppler method, in which the Doppler spectrum bandwidth is used to estimate flow, allowing flow to be probed at 90 degrees. The comparison is made using a moving thread flow phantom capable of executing various velocity profiles. This technique may allow the probing of vessels that are inaccessible to conventional oblique probing, thus complementing the conventional Doppler technique.
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Affiliation(s)
- K S Dickerson
- Biomedical Engineering and Science Institute, Drexel University, Philadelphia, Pennsylvania 19104
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45
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Tortoli P, Guidi G, Newhouse VL. Invariance of the Doppler bandwidth with range cell size above a critical beam-to-flow angle. IEEE Trans Ultrason Ferroelectr Freq Control 1993; 40:381-386. [PMID: 18263194 DOI: 10.1109/58.251286] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
For a sound beam impinging on a blood vessel, with a range cell much smaller than the vessel diameter, it is known that the breadth of the echo Doppler spectrum is proportional to the velocity of the flow through the range cell. As the range cell is lengthened to include a greater range of velocities, the spectrum is expected to widen proportionately. It is shown theoretically, and confirmed experimentally, that if the beam-to-flow angle is greater than a critical value, the Doppler spectrum bandwidth is independent of the length of the range cell, and depends only on the maximum velocity encompassed by it. This happens because for angles greater than the critical, the narrow spectra produced by lower velocity flows near the vessel walls are contained within the broader spectrum produced by the higher speed flow near the vessel axis. The critical angle is the angle at which the flow axis is normal to one of the beam edges.
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Affiliation(s)
- P Tortoli
- Dept. of Electron. Eng., Florence Univ
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46
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Abstract
The classic Doppler equation predicts that scatterers moving transversely to the ultrasound beam yield a zero frequency shift in the received echoes. An original theoretical approach, which has been developed in the last few years, has demonstrated that any focused beam leads to the generation of a Doppler spectrum with a nonzero bandwidth even for a transverse flow orientation. Based on this new theory, it is shown here that "transverse" Doppler spectral analysis can also be usefully applied in vivo. Experimental results obtained by observing normal and diseased carotid arteries at 90 degrees show that the information obtained with this approach is complementary to that provided by the mean frequency alone, which is given by the classic Doppler equation.
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Affiliation(s)
- P Tortoli
- Electronic Engineering Department, University of Florence, Italy
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47
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Tortoli P, Guidi G, Mariotti V, Newhouse VL. Experimental proof of Doppler bandwidth invariance. IEEE Trans Ultrason Ferroelectr Freq Control 1992; 39:196-203. [PMID: 18263137 DOI: 10.1109/58.139115] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A line flow of scatterers crossing the sound field produced by a focused circular transducer at uniform velocity originates a quasi-triangular Doppler spectrum. It is known that the spectrum shape and width depend on the line flow to beam axis angle, as well as on the transducer geometry. It has recently been theoretically predicted that this spectrum width is independent of the flow line location in the sound field. Experimental verification of the new theorem, based on the use of a thread phantom operated at various orientations, ranges, and offsets, with respect to the ultrasound transducer, is presented. The tests were made with a computerized pulsed Doppler system designed to perform optimal real-time spectral analysis of data obtained in this application. The prototype system and the experimental procedure adopted for demonstrating in vitro the invariance of the Doppler spectral bandwidth are described.
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Affiliation(s)
- P Tortoli
- Dept. of Electron. Eng., Florence Univ
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Abstract
A tracking procedure for processing ultrasound pulsed Doppler signals with instantaneous frequencies beyond the Nyquist limit is discussed. It is based on the observation that the frequency translation required to properly reconstruct an aliased spectrum can be achieved by means of a simple reordering of data provided by a digital fast Fourier transform (FFT) unit. The amount of reordering is automatically derived by the computed value of a spectral parameter, e.g., the mean frequency. The procedure has been tested by introducing some modifications at the output of an FFT unit included in a conventional pulsed Doppler system. As a result, the dynamic evolution of the full Doppler spectrum and related mean frequency can be followed in real time over an extended range. In vitro and in vivo experiments, as well as quantitative measurements carried on with test signals are presented.
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50
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Manes G, Tortoli P, Andreuccetti F, Avitabile G, Atzeni C. Synchronous dynamic focusing for ultrasound imaging. IEEE Trans Ultrason Ferroelectr Freq Control 1988; 35:14-21. [PMID: 18290124 DOI: 10.1109/58.4143] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
An approach to dynamic focusing of ultrasound linear array scanners is presented, leading to the unique capability of implementing a focus that continuously tracks the return signal along the penetration depth. An electronically variable lens is obtained by a heterodyning process, in which the phases of echo signals at the array elements are equalized by mixing with suitable reference oscillations. These are generated by control of a single voltage-controlled oscillator, whose frequency is properly varied in synchronism with the delay of signal from different depths. The technique has been experimentally demonstrated by modifying the focusing processor of a conventional echographic linear scanner. Superior performances have been obtained with respect to fixed-focus operation mode. The image quality results are comparable with those of multizone-focus operation mode, in which the focus is varied over more transmit/receive cycles at the expense of lower frame rate.
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Affiliation(s)
- G Manes
- Dept. of Electron. Eng., Florence Univ
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