Davies Ultrasound Physics Review QUESTIONS WITH ANSWERS

Davies Ultrasound Physics Review |\ |\ |\ |\




QUESTIONS WITH ANSWERS |\ |\




Where is the point of maximum intensity in a sound beam?
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A: Curie point
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B: Fresnel zone
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C: Focal point
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D: Fraunhofer zone
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E: F number - CORRECT ANSWERS ✔✔C: Focal point
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What action below would be most in keeping with the ALARA
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principle while performing a diagnostic ultrasound examination?
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A. Allow multiple students to scan an obstetrical patient because
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the fetus is in a good position for imaging.
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B. Prolong the sonogram to make videos of the fetus for each
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family member. |\ |\




C. Complete the diagnostic scan in a timely fashion at the lowest
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output power that achieves a quality image.
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D. Maximize the acoustic output to brighten the overall image.
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E. Extend the sonogram beyond the intended scope of the exam
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requisition. - CORRECT ANSWERS ✔✔C. Complete the diagnostic |\ |\ |\ |\ |\ |\ |\ |\


scan in a timely fashion at the lowest output power that achieves
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a quality image.
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,During performance of an obstetrical ultrasound exam you adjust
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the system parameters to improve the image. Which of the
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following parameters would increase acoustic exposure?
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A: Increase gain
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B: Increase TGC
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C: Increase frequency
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D: Increase transmit power
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E: Increase frame averaging - CORRECT ANSWERS ✔✔D: Increase
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transmit power
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To minimize the risk of biological effects of ultrasound to the
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fetus, which imaging mode tradeoff would be most applicable?
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A. Use M-mode instead of pulsed-wave Doppler to measure the
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fetal heart rate.
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B. Use color Doppler instead of power Doppler to image the
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umbilical cord. |\ |\




C. Use pulsed-wave Doppler instead of power Doppler to evaluate
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the fetal heart.
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D. Use harmonics instead of fundamental to image the fetal
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spine. |\




E. All of the above. - CORRECT ANSWERS ✔✔A. Use M-mode
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instead of pulsed-wave Doppler to measure the fetal heart rate.
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What potential bioeffect occurs through absorption of sound
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energy by tissue? |\ |\




A. Cavitation
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B. Heating
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,C. Attenuation
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D. Reflection
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E. Refraction - CORRECT ANSWERS ✔✔B. Heating
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When practicing universal precautions you should do all of the
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following EXCEPT: |\




A: Wear gloves when there is a potential for contact with patient
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bodily fluids. |\ |\




B: Change gloves when moving from one patient to another.
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C: Wash hands immediately after gloves are removed.
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D: Wear face masks or eye protection whenever there is a
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possibility of blood splashing into your face. |\ |\ |\ |\ |\ |\ |\




E: Wash gloves between exams for re-use from one patient to
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another. - CORRECT ANSWERS ✔✔E: Wash gloves between exams
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for re-use from one patient to another.
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A nosocomial infection is defined as one that:
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A. Is resistant to antibiotics
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B. Is restricted to the respiratory system
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C. Is hospital-acquired
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D. Is not contagious
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E. Requires patient isolation - CORRECT ANSWERS ✔✔C. Is
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hospital-acquired


Thermally induced biological effects should be preventable by
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avoiding a local tissue temperature increase exceeding:
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, A: 1 degree C
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B: 4 degrees C
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C: 10 degrees C
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D: 95 degrees F
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E: None; thermal effects have no threshold. - CORRECT ANSWERS
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✔✔A: 1 degree C
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Which intensity descriptor has the lowest numerical value for the
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characterization of a pulsed-wave ultrasonic field? |\ |\ |\ |\ |\




A: SATA
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B: SPTA
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C: SATP
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D: SPTP
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E: These intensity descriptors are only used for continuous-wave
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ultrasound. - CORRECT ANSWERS ✔✔A: SATA |\ |\ |\ |\ |\




Increased tissue heating could occur when you:
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A: Decrease frequency.
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B: Increase transmit power.
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C: Decrease exposure time.
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D: Decrease pulse repetition frequency.
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E: All of the above - CORRECT ANSWERS ✔✔B: Increase transmit
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power.