Source:http://linkedlifedata.com/resource/umls/id/C1456803
MSH: A subfield of acoustics dealing in the radio frequency range higher than acoustic SOUND waves (approximately above 20 kilohertz). Ultrasonic radiation is used therapeutically (DIATHERMY and ULTRASONIC THERAPY) to generate HEAT and to selectively destroy tissues. It is also used in diagnostics, for example, ULTRASONOGRAPHY; ECHOENCEPHALOGRAPHY; and ECHOCARDIOGRAPHY, to visually display echoes received from irradiated tissues.,CSP: mechanical radiant energy with a frequency greater than 20,000 hertz (cycles per second).,NCI: High frequency sound, generally with a frequency greater than 20,000 Hz.