Color Doppler Flow Imaging(CDFI,Japan Toshiba 6000 and America HP 1500) was used,and detecting frequencies of transthoracic echocardiography(TTE) and transesophageal echocardiography(TEE) were 2.5 MHz and 5 MHz respectively.

• 使用仪器日本东芝6000型和美国惠普1500型彩色多普勒血流显象仪(CDE)和食道超声(TEE)探头频率分别为2.；5 MHz和5 MHz。