Which is false about the following statements on ultrasound and nuclear medicine

Question

Which is false about the following statements on ultrasound and nuclear medicine imaging? Snell's Law applies to optics but not to acoustic-signals. Doppler imaging exploits frequency shift in ultrasound imaging to estimate tissue motion such as blood flow. SPECT is characterized by the emission of positrons by a radioactive source that selectively binds to tissue, which entails the annihilation of each positron by a nearby electron, and which in turn results in a pair of photons being emitted in opposite directions. Answers a and c are false. Answers a. b and c are false.

Explanation / Answer

d. Answers a and c are false.

(Sneel's law applies to both optics and acoustic signals.)

(SPECT emits gamma rays )

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