M-mode echocardiography

例句：

1. 1.M-mode echocardiography is a non-invasive method used to diagnose heart disease.
   M型超声心动图是一种非侵入性方法，用于诊断心脏病。
2. 2.During the procedure, the doctor will use an M-mode echocardiogram to evaluate the patient's heart function.
   在手术过程中，医生将使用M型超声心动图来评估患者的心脏功能。
3. 3.The M-mode echocardiography results showed that the patient had mild mitral valve regurgitation.
   M型超声心动图结果显示，患者有轻度的二尖瓣反流。