High‐resolution selective three‐dimensional magnetic resonance coronary angiography with navigator‐echo technique: Segment‐by‐segment evaluation of coronary artery stenosis

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Abstract
Purpose To investigate the feasibility of high‐resolution selective three‐dimensional (3D) magnetic resonance coronary angiography (MRCA) in the evaluation of coronary artery stenoses. Materials and Methods In 12 patients with coronary artery stenoses, MRCA of the coronary artery groups, including the coronary segments with stenoses of 50% or greater based on conventional x‐ray coronary angiography (CAG), was performed with double‐oblique imaging planes by orienting the 3D slab along the major axis of each right coronary artery‐left circumflex artery (RCA‐LCX) group and each left main trunk‐left anterior descending artery (LMT‐LAD) group. Ten RCA‐LCX and five LMT‐LAD MR angiograms were obtained, and the results were compared with those of conventional x‐ray angiography. Results Among 70 coronary artery segments expected to be covered, a total of 49 (70%) segments were fully demonstrated in diagnostic quality. The identification of segmental location of stenoses showed as high an accuracy as 96%. The retrospective analysis for stenosis of 50% or greater yielded the sensitivity, specificity, and accuracy of 80%, 85%, and 84%, respectively. Conclusion Selective 3D MRCA has the potential for segment‐by‐segment evaluation of major portions of the right and left coronary arteries with high accuracy. J. Magn. Reson. Imaging 2002;16:238–245.

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