Question

_______ instruments are now available for the measurement of blood velocity, volume flow, flow direction, flow profile and to visualize the internal lumen of blood vessel.

(a) Transit-time

(b) Doppler-shift

(c) Square wave

(d) Sine wave

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This intriguing question originated from Cyber Medicine topic in division Telemedicine Technology of Biomedical Instrumentation

Answer 1

The correct answer is (b) Doppler-shift

For explanation: For routine clinical measurements, the transcutaneous Doppler instrument has, by far, superseded the transit-time type. Therefore, most of the recent efforts have been concentrated on the development of Doppler-shift instruments, which are now available for the measurement of blood velocity, volume flow, flow direction, flow profile and to visualize the internal lumen of a blood vessel.