An instrument that in a painless and noninvasive manner uses the differential transmission and reflection of ultrasonic waves to create a detailed visual image of the brain.
超声波心动描记器一种用来显示详细的大脑图象的仪器, 利用超声波发送和反射的差异来测试并无伤无痛
The doctors gave him an ultrasonic brain scan.
医生给他做了脑部超声波扫描检查。
