Which of the following is a non-invasive technique to measure blood velocity in a particular vessel from surface of the body?(a) Electromagnetic(b) Ultrasonic(c) NMR(d) Laser DopplerThis question was addressed to me during an online interview.My question is based upon Cyber Medicine in section Telemedicine Technology of Biomedical Instrumentation

Which of the following is a non-invasive technique to measure blood ve

1.	Which of the following is a non-invasive technique to measure blood velocity in a particular vessel from surface of the body?(a) Electromagnetic(b) Ultrasonic(c) NMR(d) Laser DopplerThis question was addressed to me during an online interview.My question is based upon Cyber Medicine in section Telemedicine Technology of Biomedical Instrumentation
Answer» Right ANSWER is (b) Ultrasonic The best I can EXPLAIN: Ultrasonic is a non-invasive technique to measure blood VELOCITY in a PARTICULAR vessel from the surface of the body. It is based on the analysis of echo signals from the erythrocytes in the vascular structures. Because of the Doppler effect, the frequency of these echo signals changes relative to the frequency which the probe transmits.

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