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
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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 Answer: C: Complete the diagnostic scan in a timely fashion at the lowest output power that achieves a quality image.
What does the ALARA principle stand for? Correct Answer: As Low As Reasonable Achievable
During performance of an obstetrical ultrasound exam you adjust the system parameters to improve the image. Which of the following parameters would increase acoustic exposure?
A: Increase gain
B: Increase TGC
C: Increase frequency
D: Increase transmit power
E: Increase frame averaging Correct Answer: D: Increase transmit power
While performing a sonogram to minimize risk to the fetus which imaging mode trade off would be most applicable?
A: Use M-mode instead of pulsed-wave Doppler to measure the fetal heart rate.
B: Use color Doppler instead of power Doppler to image the umbilical cord.
C: Use pulsed-wave Doppler instead of power Doppler to evaluate the fetal heart.
D: Use harmonics instead of fundamental to image the fetal spine.
E: All of the above. Correct Answer: A: Use M-mode instead of pulsed-wave Doppler to measure the fetal heart rate.
Gain, TGC, and frame averaging do not affect _______ and therefore do not affect _______. Correct Answer: -Sound transmission
-Exposure
T or F: Increasing frequency does not increase exposure. Correct Answer: True
What potential bioeffect occurs through absorption of sound energy by tissue?
A: Cavitation
B: Heating
C: Attenuation
D: Reflection
E: Refraction Correct Answer: B: Heating
When practicing universal precautions you should do all of the following EXCEPT:
A: Wear gloves when there is a potential for contact with patient bodily fluids.
B: Change gloves when moving from one patient to another.
C: Wash hands immediately after gloves are removed.
D: Wear face masks or eye protection whenever there is a possibility of blood splashing into your face.
E: Wash gloves between exams for re-use from one patient to another. Correct Answer: E: Wash gloves between exams for RE-use from one patient to another.
A nosocomial infection is defined as one that is:
A: Resistant to antibiotics
B: Restricted to the respiratory system
C: Hospital-acquired
D: Not contagious
E: Requires isolation Correct Answer: C: 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 Answer: A: 1 degree C
Which intensity descriptor has the lowest numerical value for the characterization of a pulsed-wave ultrasonic field?
A: SATA
B: SPTA
C: SATP
D: SPTP
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