Q:

Which statement about a Doppler ultrasound stethoscope is true?

belongs to book: Examination Questions and Answers in Basic Anatomy and Physiology|Martin Caon|| Chapter number:16.4| Question number:3

waelhammad

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2022-10-21

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Which statement about a Doppler ultrasound stethoscope is true?

They amplify the echo produced when ultrasound strikes a boundary between two tissues of different impedance.
Their operation depends on the reflected ultrasound being at a different frequency to the emitted ultrasound.
They emit ionising radiation.
The depth of penetration of ultrasound into tissue increases as the frequency of ultrasound increases.

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waelhammad

2022-10-21

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B: A Doppler “stethoscope” produces ultrasound and detects the reflected ultrasound from moving red blood cells (or the moving heart wall). The motion of the object reflecting the ultrasound causes the reflected ultrasound to be shifted in frequency. Its depth of penetration in human tissue DEcreases as it frequency increases.

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