Davies Ultrasound Physics Review 2016 edition (COMPLETE SOLUTION)
*** What action would be most in keeping w the ALARA principle while performing a diagnostic ultrasound exam? - Complete the diagnostic scan in a timely fashion at the lowest output power that achieves a quality image Advocating use of the ALARA principle (as low as reasonably achievable) prudently minimizes the risk of bio effects (even tho epidemiological studies have revealed no known risk associated w the use of diagnostic ultrasound) ***During performance of an obstetric ultrasound exam, you adjust the system parameters to improve the image. Which of the following parameters would increase acoustic exposure? - Increase transmit power The transmit power is the only control listed that will affect the exposure of the patient to acoustic power. Gain, TGC and frame averaging (persistence) do not affect sound transmission and therefore do not affect exposure. Increasing freq will not increase exposure ***To minimize the risk of biologic effects of ultrasound to the fetus, which imaging mode tradeoff would be most applicable? - Use M-mode instead of pulsed wave doppler to measure the fetal heart rate. Pulsed wave doppler increases the time average intensity compared to M-mode What potential bio effect occurs thru absorption of sound energy by tissue? - Heating
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