然后将其行开胸手术，悬吊心包，在心外膜上放置一水囊，将探头放置于水囊上进行探查。
One water sac was placed on the epicardium and the exploration was performed by the detecting head on the water sac.
目的设计用高频超声线阵探头（HFU）观察心尖部室间沟部位心外膜冠状动脉（ECA）结构和血流。
Objective:This study designed to image the epicardial coronary artery (ECA) and flow in apical interventricular furrow using transthoracic high frequency linear ultrasound probe (HFU).
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