Davies Ultrasound Physics Review
Questions With Complete Solutions |
Updated
/. Where is the point of maximum intensity in a sound beam?
A: Curie point
B: Fresnel zone
C: Focal point
D: Fraunhofer zone
E: F number - Answer-C: Focal point
/.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. - Answer-
C. Complete the diagnostic scan in a timely fashion at the lowest output power that
achieves a quality image.
/.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 - Answer-D: Increase transmit power
/.To minimize the risk of biological effects of ultrasound to the fetus, which imaging
mode tradeoff 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. - Answer-A. Use M-mode instead of pulsed-wave Doppler to
measure the fetal heart rate.
/.What potential bioeffect occurs through absorption of sound energy by tissue?
,A. Cavitation
B. Heating
C. Attenuation
D. Reflection
E. Refraction - 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. - Answer-E:
Wash gloves between exams for re-use from one patient to another.
/.A nosocomial infection is defined as one that:
A. Is resistant to antibiotics
B. Is restricted to the respiratory system
C. Is hospital-acquired
D. Is not contagious
E. Requires patient isolation - Answer-C. 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. - 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
E: These intensity descriptors are only used for continuous-wave ultrasound. - Answer-
A: SATA
/.Increased tissue heating could occur when you:
A: Decrease frequency.
B: Increase transmit power.
C: Decrease exposure time.
D: Decrease pulse repetition frequency.
E: All of the above - Answer-B: Increase transmit power.
,/.A study designed to determine if there is an association between an adverse effect in a
population and exposure to a particular agent is a(n):
A: Case report
B: Epidemiological study
C: In vitro study
D: In vivo study
E: Single-incident investigation - Answer-B: Epidemiological study
/.Which of the following actions is NOT compliant with HIPAA?
A. Cropping all patient identifiers from images used for teaching purposes.
B. Refraining from disclosing patient health information without proper authorization
C. Reviewing your neighbor's medical studies on your hospital PACS system so you
can giver her an opinion of her condition
D. Covering your daily requisition list so that the names are not visible to patients and
visitors
E. All of these actions are compliant with HIPAA - Answer-C. Reviewing your neighbor's
medical studies on your hospital PACS system so you can giver her an opinion of her
condition
/.What does the mechanical index indicate on an ultrasound system?
A. The maximum temperature increase in tissue
B. The minimum temperature increase in tissue
C. Acoustic power in milliwatts
D. The likelihood of cavitation during an ultrasound exam
E. Minutes of exposure time before tissue heating is too great - Answer-D. The
likelihood of cavitation during an ultrasound exam
/.In medicine what do the initials "PHI" indicate?
A: Private health indicator
B: Personal heart index
C: Personal health information
D: Private health institute
E: Protected health information - Answer-E: Protected health information
/.What should you limit when the thermal index exceeds 1?
A. Overall gain
B. Time gain compensation
C. Exposure time
D. Scanning depth
E. All of the above - Answer-C. Exposure time
/.To practice the ALARA principle, which of the following techniques should you
employ?
A. Always use the least amount of receiver gain that allows adequate tissue
visualization
B. Adjust the controls so the the MI and TI readouts exceed 1
, C. Use the lowest transmit power that allows adequate tissue visualization
D. Use the highest frame averaging (persistence) setting
E. Maximize exposure time - Answer-C. Use the lowest transmit power that allows
adequate tissue visualization
/.The thermal index indicates:
A. Estimated temperature increase in tissue
B. Minutes of exposure time before heating is too great
C. Seconds of exposure time before heating is too great
D. Acoustic power in milliwatts
E. Likelihood of cavitation - Answer-A. Estimated temperature increase in tissue
/.Which operator control most directly adjusts the intensity of the transmitted pulse?
A. receiver gain
B. Depth of scanning
C. Acoustic output (transmit) power
D. Time gain compensation
E. Pulse repetition frequency - Answer-C. Acoustic output (transmit) power
/.Which of the following should show the highest intensity value?
A. SATP
B. SATA
C. Im
D. SPPA
E. SPTP - Answer-E. SPTP
/.Which intensity parameter is not applicable for continuous-wave ultrasound?
A: SATA
B: SPTA
C: SPPA
D: SAPA
E: C and D - Answer-E. C and D
/.Which of the following would most likely have the highest SPTA value?
A. CW Doppler
B. B-mode real-time scanners
C. Static B-mode scanners
D. PW doppler
E. Fetal monitor Doppler - Answer-D. PW doppler
/.Using a hydrophone you can measure?
A: Impedance
B: Pressure amplitude
C: Duty factor
D: All of the above
E: B and C only - Answer-E: B and C only
Questions With Complete Solutions |
Updated
/. Where is the point of maximum intensity in a sound beam?
A: Curie point
B: Fresnel zone
C: Focal point
D: Fraunhofer zone
E: F number - Answer-C: Focal point
/.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. - Answer-
C. Complete the diagnostic scan in a timely fashion at the lowest output power that
achieves a quality image.
/.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 - Answer-D: Increase transmit power
/.To minimize the risk of biological effects of ultrasound to the fetus, which imaging
mode tradeoff 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. - Answer-A. Use M-mode instead of pulsed-wave Doppler to
measure the fetal heart rate.
/.What potential bioeffect occurs through absorption of sound energy by tissue?
,A. Cavitation
B. Heating
C. Attenuation
D. Reflection
E. Refraction - 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. - Answer-E:
Wash gloves between exams for re-use from one patient to another.
/.A nosocomial infection is defined as one that:
A. Is resistant to antibiotics
B. Is restricted to the respiratory system
C. Is hospital-acquired
D. Is not contagious
E. Requires patient isolation - Answer-C. 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. - 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
E: These intensity descriptors are only used for continuous-wave ultrasound. - Answer-
A: SATA
/.Increased tissue heating could occur when you:
A: Decrease frequency.
B: Increase transmit power.
C: Decrease exposure time.
D: Decrease pulse repetition frequency.
E: All of the above - Answer-B: Increase transmit power.
,/.A study designed to determine if there is an association between an adverse effect in a
population and exposure to a particular agent is a(n):
A: Case report
B: Epidemiological study
C: In vitro study
D: In vivo study
E: Single-incident investigation - Answer-B: Epidemiological study
/.Which of the following actions is NOT compliant with HIPAA?
A. Cropping all patient identifiers from images used for teaching purposes.
B. Refraining from disclosing patient health information without proper authorization
C. Reviewing your neighbor's medical studies on your hospital PACS system so you
can giver her an opinion of her condition
D. Covering your daily requisition list so that the names are not visible to patients and
visitors
E. All of these actions are compliant with HIPAA - Answer-C. Reviewing your neighbor's
medical studies on your hospital PACS system so you can giver her an opinion of her
condition
/.What does the mechanical index indicate on an ultrasound system?
A. The maximum temperature increase in tissue
B. The minimum temperature increase in tissue
C. Acoustic power in milliwatts
D. The likelihood of cavitation during an ultrasound exam
E. Minutes of exposure time before tissue heating is too great - Answer-D. The
likelihood of cavitation during an ultrasound exam
/.In medicine what do the initials "PHI" indicate?
A: Private health indicator
B: Personal heart index
C: Personal health information
D: Private health institute
E: Protected health information - Answer-E: Protected health information
/.What should you limit when the thermal index exceeds 1?
A. Overall gain
B. Time gain compensation
C. Exposure time
D. Scanning depth
E. All of the above - Answer-C. Exposure time
/.To practice the ALARA principle, which of the following techniques should you
employ?
A. Always use the least amount of receiver gain that allows adequate tissue
visualization
B. Adjust the controls so the the MI and TI readouts exceed 1
, C. Use the lowest transmit power that allows adequate tissue visualization
D. Use the highest frame averaging (persistence) setting
E. Maximize exposure time - Answer-C. Use the lowest transmit power that allows
adequate tissue visualization
/.The thermal index indicates:
A. Estimated temperature increase in tissue
B. Minutes of exposure time before heating is too great
C. Seconds of exposure time before heating is too great
D. Acoustic power in milliwatts
E. Likelihood of cavitation - Answer-A. Estimated temperature increase in tissue
/.Which operator control most directly adjusts the intensity of the transmitted pulse?
A. receiver gain
B. Depth of scanning
C. Acoustic output (transmit) power
D. Time gain compensation
E. Pulse repetition frequency - Answer-C. Acoustic output (transmit) power
/.Which of the following should show the highest intensity value?
A. SATP
B. SATA
C. Im
D. SPPA
E. SPTP - Answer-E. SPTP
/.Which intensity parameter is not applicable for continuous-wave ultrasound?
A: SATA
B: SPTA
C: SPPA
D: SAPA
E: C and D - Answer-E. C and D
/.Which of the following would most likely have the highest SPTA value?
A. CW Doppler
B. B-mode real-time scanners
C. Static B-mode scanners
D. PW doppler
E. Fetal monitor Doppler - Answer-D. PW doppler
/.Using a hydrophone you can measure?
A: Impedance
B: Pressure amplitude
C: Duty factor
D: All of the above
E: B and C only - Answer-E: B and C only
