Introduction
WH MRCA studies are usually performed during the stationary period of coronary arteries, which is determined using cine display and therefore depends on the operator's experience. Several automatic methods have been developed. One such method uses the global heart signal for analysis [1] and is suitable for detecting motion during all cardiac phases, but this method tends to suffer from noise. Another method employs a ROI for analysis [2] and is suitable for precise detection of the stationary period, but not for all cardiac phases. We have developed the Global-to-Local Tandem Method, in which the coronary stationary period is roughly analyzed by the global method and then precisely analyzed by the local method. We have also conducted clinical feasibility studies.