单词	ultrasound
释义	ultrasound /ˈʌltrəsaʊnd / noun [mass noun] 1Sound or other vibrations having an ultrasonic frequency, particularly as used in medical imaging: [as modifier]: an ultrasound scanner... Echocardiography is the study of the heart using high frequency sound waves or ultrasound. The big brother of ultrasound, infrasound means frequencies too low to be heard by the human ear. It has a video camera eye, and several ultrasound sensors which emit pulses of sound and can measure the distance from an object by the echo. 1.1 [count noun] An ultrasound scan, especially one of a pregnant woman to examine the fetus: I have to take my daughter-in-law for her ultrasound... ‘They have to have hormonal injections, come for ultrasounds, scans, blood tests - and honestly I can't see anybody doing it for free,’ says Tan. These tests may include blood tests, urinalysis and imaging studies, such as ultrasounds or angiography. Does she get yearly ultrasounds and blood tests to screen for ovarian cancer?
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