408 Automatic ROI placing for selecting optimal data acquisition window for magnetic resonance coronary angiography
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KeywordsUser Interaction Heart Region Magnetic Resonance Coronary Angiography Retrospective Gating Toshiba Medical System Corporation
Magnetic resonance coronary angiography (MRCA) has great potential for the diagnosis of coronary artery disease. However, the quality and accuracy of coronary MR angiography varies from subject to subject. Reducing cardiac motion effects in coronary arteries requires quantitative information on the motion of the coronary arteries throughout the cardiac cycle. However, there is little quantitative information on rest period. In the previous study, a new automatic measurement of the cardiac rest period using an image based global cross-correlation of multi heart-phase cine-scans in comparison to visual assessment was developed. The method still requires substantial user interaction such as placing a region of interest (ROI). There exists several automated post-processing method without user interaction for the selection of the optimal data acquisition in MRCA, however, a user has to define a threshold value substantially.
The purpose of this work is to develop an automated method without user interaction for the optimal placing of ROI in coronary MRA.
Calculated appropriate ROI location was compared to the visually determined optimal ROI location. The comparison results of the observed and automatically calculated ROI location are as follows. In thirteen subjects (87%), the visual assessment was almost equal to the calculated area. Thus a high correlation between the automatically and visually determined center points for ROI placing was found.
Automated placing of ROI yielded similar results compared to visual assessment. The study facilitates user independent assessment of the optimal ROI placing for MRCA. A ROI scale (44 × 44 mm) is appropriate for calculating CC between ROI template and the first phase. This technique can be used for further procedure such as determining data acquisition window in the quiescent period of the cardiac cycle and most helpful for MRCA when aiming at 3-dimensional coverage of the whole coronary arteries during a single scan.
This article is published under license to BioMed Central Ltd.