Objective To observe the collateral flow by color Doppler coronary flow imaging(CDCFI) system and to establish a noninvasive method to evaluate coronary collateral flow after coronary occlusion.

• 目的观察冠脉血流显像无创技术对心肌梗死缺血区的侧支循环状况，以期建立无创检测缺血区侧支循环新方法。