| Automated vessel edge detection in velocity-encoded cine-MR (VEC-MR) flow measurements: a retrospective evaluation in critically ill patients. | |
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MedLine Citation:
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PMID: 14652146 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: To assess feasibility of automated edge detection in magnetic resonance (MR) flow calculations in a clinical setting with critically ill patients. MATERIAL AND METHODS: Velocity encoded cine-MR (VEC-MR) flow measurements cross-sectional area (CSA), mean spatial velocity (MSV), instantaneous flow (IF), flow (F), 0.5 T Philips, TR 800-800, TE=8 ms, 30 degrees flip angle, FOV 280 mm, 128 x 256 matrix, temporal resolution 16 time frames/RR, VENC=120 cm/s) were obtained in 20 major thoracic human vessels (ascending aorta, main, right and left pulmonary artery-AAO, MPA, RPA, LPA) of five patients, suffering from severe chronic thromboembolic pulmonary hypertension (CTEPH). Flow maps were evaluated by two independent observers using conventional manual edge detection (INTER m/m). Flow calculations were performed by one observer using both, manual and automated edge detection (INTRA m/a), by a second observer using automated edge detection two times (INTRA a/a) and by two independent observers using automated edge detection (INTER a/a). Evaluation time was measured. Linear regression analysis and Student's t-test were performed. RESULTS: Overall regression coefficients (r2) for INTER m/m, INTRA m/a, INTER a/a and INTRA a/a, respectively, were as follows: CSA, 0.91, 0.91, 0.96, 0.98; MSV, 0.97, 0.99, 0.99, 0.99; IF, 0.98, 0.99, 0.99, 0.99; F, 0.98, 0.99, 0.99, 0.99. Manual CSA values differed significantly from automated data in MPA (P=0.01), RPA (P=0.0008) and LPA (P=0.02). No difference was found for the other assessed parameters of the pulmonary circulation. Average evaluation time per vessel was 20.2+/-2.6 min for manual and 2.1+/-0.7 min for automated edge detection (P<0.00001). CONCLUSION: The software program used provided reproducible data, lead to a 90% reduction in evaluation and calculation time and, therefore, might excel the utilization of VEC-MR flow measurements. Despite variations in the evaluation of the pulmonary circulation CSAs, flow assessment is feasible in critically ill patients. |
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Authors:
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Christine B Henk; Stephan Grampp; Werner Backfrieder; Jasmin Liskutin; Christian Czerny; Gerhard H Mostbeck |
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Publication Detail:
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Type: Evaluation Studies; Journal Article |
Journal Detail:
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Title: European journal of radiology Volume: 48 ISSN: 0720-048X ISO Abbreviation: Eur J Radiol Publication Date: 2003 Dec |
Date Detail:
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Created Date: 2003-12-03 Completed Date: 2004-06-23 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 8106411 Medline TA: Eur J Radiol Country: Ireland |
Other Details:
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Languages: eng Pagination: 274-81 Citation Subset: IM |
Affiliation:
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Department of Radiology, Ludwig-Boltzmann Institute for Clinical and Experimental Radiology, University of Vienna, Währingergürtel 18-20, A-1090 Vienna, Austria. christine.henk@univie.ac.at |
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| MeSH Terms | |
Descriptor/Qualifier:
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Blood Flow Velocity
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physiology* Chronic Disease Critical Illness Feasibility Studies Female Humans Hypertension, Pulmonary / diagnosis Linear Models Magnetic Resonance Angiography / methods* Magnetic Resonance Imaging, Cine / methods* Male Middle Aged Observer Variation Pulmonary Circulation / physiology* Retrospective Studies Thoracic Arteries / pathology* |
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