SPI Davies, UT Physics, part 1 questions with complete solutions

What action below would be most in keeping with the ALARA principle while performing a diagnostic ultrasound examination? A: Allow multiple students to scan an obstetrical patient because the fetus is in a good position for imaging. B: Prolong the sonogram to make videos of the fetus for each family member. C: Complete the diagnostic scan in a timely fashion at the lowest output power that achieves a quality image. D: Maximize the acoustic output to brighten the overall image. E: Extend the sonogram beyond the intended scope of the exam requisition. CORRECT ANSWERS: C. Complete the diagnostic scan in timely fashion at the lowest output power that achieves a quality image. 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? A. increase receiver gain B. increase TGC C. increase transmitted power D. increase frequency E. increase frame averaging ( persistence) CORRECT ANSWERS: Increase transmit power To minimize the of biologic effects of ultrasound to the fetus, which imaging mode tradeoff would be most applicable? CORRECT ANSWERS: M-mode, instead of pulse-wave Doppler to measure the fetal heart rate. What potential bio effect occurs through absorption of sound energy by tissue? A. Cavitation B. Heating C. Attenuation D. Reflection E. Refraction CORRECT ANSWERS: B. Heating When practicing universal precautions, you should do all of the following. EXCEPT: CORRECT ANSWERS: Wash gloves between exams for reuse from one patient to another. Nosocomial pneumonia infection is defined as one that: CORRECT ANSWERS: Is hospital-acquired Thermally induced biological effects should be preventable by avoiding a local tissue temperature increase exceeding: A: 1 degree C B: 4 degrees C C: 10 degrees C D: 95 degrees F E: None; thermal effects have no threshold. CORRECT