age 1 of 303
Davies Ultrasound Physics TEST STUDY GUIDE
2025/2026 ACCURATE QUESTIONS AND VERIFIED
CORRECT SOLUTIONS WITH RATIONALES || 100%
GUARANTEED PASS <RECENT VERSION>
1. What action would be most in keeping w the ALARA principle
while performing a diagnostic ultrasound exam?
......ANSWER........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
with the use of diagnostic ultrasound).
,age 2 of 303
2. 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?
......ANSWER........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 frequency will
not increase exposure.
3. To minimize the risk of biologic effects of ultrasound to the
fetus, which imaging mode tradeoff would be most applicable?
......ANSWER........Use M-mode instead of pulsed-wave Doppler
to measure the fetal heart rate.
,age 3 of 303
Pulsed wave Doppler increases the time average intensity
compared to M-mode.
4. What potential bioeffect occurs through absorption of sound
energy by tissue? ......ANSWER........Heating
Sound attenuation in tissue is primarily due to absorption
(conversion of ultrasound to heat).
5. When practicing universal precautions, you should do all the
following EXCEPT: ......ANSWER........Wash gloves between
exams for reuse from one patient to another. (It is recommended
that gloves be worn during every ultrasound examination. They
should be discarded after use).
-wear gloves when there is a potential for contract with patient
body fluid
, age 4 of 303
-change gloves when moving from one patient to another
-Wash hands immediately after gloves are removed
- Wear face masks or eye protection whenever there is a
possibility of blood splashing in your face
6. A nosocomial infection is defined as one that:
......ANSWER........Is hospital-acquired
7. Thermally induced biologic effects should be preventable by
avoiding a local tissue temperature increase exceeding:
......ANSWER........1°C
8. Which intensity descriptor has the lowest numeric value for the
characterization of a pulsed-wave ultrasonic field?
......ANSWER........SATA
Davies Ultrasound Physics TEST STUDY GUIDE
2025/2026 ACCURATE QUESTIONS AND VERIFIED
CORRECT SOLUTIONS WITH RATIONALES || 100%
GUARANTEED PASS <RECENT VERSION>
1. What action would be most in keeping w the ALARA principle
while performing a diagnostic ultrasound exam?
......ANSWER........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
with the use of diagnostic ultrasound).
,age 2 of 303
2. 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?
......ANSWER........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 frequency will
not increase exposure.
3. To minimize the risk of biologic effects of ultrasound to the
fetus, which imaging mode tradeoff would be most applicable?
......ANSWER........Use M-mode instead of pulsed-wave Doppler
to measure the fetal heart rate.
,age 3 of 303
Pulsed wave Doppler increases the time average intensity
compared to M-mode.
4. What potential bioeffect occurs through absorption of sound
energy by tissue? ......ANSWER........Heating
Sound attenuation in tissue is primarily due to absorption
(conversion of ultrasound to heat).
5. When practicing universal precautions, you should do all the
following EXCEPT: ......ANSWER........Wash gloves between
exams for reuse from one patient to another. (It is recommended
that gloves be worn during every ultrasound examination. They
should be discarded after use).
-wear gloves when there is a potential for contract with patient
body fluid
, age 4 of 303
-change gloves when moving from one patient to another
-Wash hands immediately after gloves are removed
- Wear face masks or eye protection whenever there is a
possibility of blood splashing in your face
6. A nosocomial infection is defined as one that:
......ANSWER........Is hospital-acquired
7. Thermally induced biologic effects should be preventable by
avoiding a local tissue temperature increase exceeding:
......ANSWER........1°C
8. Which intensity descriptor has the lowest numeric value for the
characterization of a pulsed-wave ultrasonic field?
......ANSWER........SATA
