Davies Ultrasound Physics Review Save Groups
Questions And Answers Already
Graded A+ | Latest Update
Terms in this set (717)
Complete the diagnostic scan in a timely fashion at the lowest output power that
achieves a quality image
1. What action would be most in keeping w
the ALARA principle while performing
Advocating use of the ALARA principle (as low as reasonably achievable) prudently
a
minimizes the risk of bio effects (even tho epidemiological studies have revealed
diagnostic ultrasound exam?
no known risk associated with the use of diagnostic ultrasound).
Increase transmit power.
2. During performance of an obstetric
ultrasound exam, you adjust the system
The transmit power is the only control listed that will affect the exposure of
parameters to improve the image. Which
the patient to acoustic power. Gain, TGC, and frame averaging (persistence) do
of the following parameters would
not affect sound transmission and therefore do not affect exposure.
increase acoustic exposure?
Increasing
frequency will not increase exposure.
3. To minimize the risk of biologic effects of Use M-mode instead of pulsed-wave Doppler to measure the fetal heart rate.
ultrasound to the fetus, which imaging
mode tradeoff would be most applicable? Pulsed wave Doppler increases the time average intensity compared to M-mode.
Heating
4. What potential bioeffect occurs through
absorption of sound energy by tissue? Sound attenuation in tissue is primarily due to absorption (conversion of ultrasound
to heat).
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).
5. When practicing universal precautions,
-wear gloves when there is a potential for contract with patient body fluid
you should do all the following EXCEPT:
-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 Is hospital-acquired
that:
1/11
, 7. Thermally induced biologic effects 1°C
should be preventable by avoiding a
local tissue temperature increase
exceeding:
SATA
8. Which intensity descriptor has the
lowest numeric value for the SATA, a term that is infrequently used, means spatial average, time average. Note:
characterization of a pulsed-wave I(SPTA) is the spatial peak, time average intensity; I(SPTP) is the spatial peak,
ultrasonic field? temporal peak.
9* Increased tissue heating could occur Increase transmit power
when you:
A study designed to determine if there is an Epidemiological study
association between an adverse effect in a
population and exposure to a particular
agent is an:
Reviewing your neighbors medical studies on your hospital PACS system so you can
give her your opinion of her condition
Which of the following actions is NOT
compliant w HIPPA? The Health Insurance Portability and Accountability Act (HIPPA) includes rules to
protect the privacy of the individuals health information. This answer would violate
HIPPA
The likelihood of cavitation during an ultrasound exam
What does the mechanical index indicate
on an ultrasound system? Mechanical index is derived from the peak rarefaction pressure and the ultrasound
freq, parameters shown to be associated w onset of cavitation
In medicine, what do the initials PHI Protected health information
indicate?
14*What should you limit when the thermal Exposure time
index exceeds 1?
15*To practice the ALARA principle, which Use the lowest transmit power that allows adequate tissue visualization
of the following techniques should you
employ? Use a high gain and low transmit power
Estimated temperature increase in tissue
Temperature increase is calculated assuming certain values for the absorption and
The thermal index indicates: thermal properties of tissues and taking into account factors such as beam
geometry, freq and power. Technically, it is the ratio of the power being produced
to the power needed for a 1° C temperature increase if tissues have the assumed
properties
Acoustic output (transmit) power
17*The operator control most directly
adjusts the intensity of the transmitted
Pulse repetition freq can also affect the intensity, specifically the I(SPTA) because it
pulse?
affects the duty factor
SPTP
Which of the following would show the
highest intensity value? Note that Im is the intensity over the half wave period within the transmit pulse where
it is the greatest! This term is seldom specified
Which intensity parameter is not SPPA and SAPA refer to pulse average intensities, which do not apply to continuous
applicable for continuous wave wave ultrasound.
ultrasound?
Which of the following would most likely PW doppler
have the highest SPTA value?
2/11
Questions And Answers Already
Graded A+ | Latest Update
Terms in this set (717)
Complete the diagnostic scan in a timely fashion at the lowest output power that
achieves a quality image
1. What action would be most in keeping w
the ALARA principle while performing
Advocating use of the ALARA principle (as low as reasonably achievable) prudently
a
minimizes the risk of bio effects (even tho epidemiological studies have revealed
diagnostic ultrasound exam?
no known risk associated with the use of diagnostic ultrasound).
Increase transmit power.
2. During performance of an obstetric
ultrasound exam, you adjust the system
The transmit power is the only control listed that will affect the exposure of
parameters to improve the image. Which
the patient to acoustic power. Gain, TGC, and frame averaging (persistence) do
of the following parameters would
not affect sound transmission and therefore do not affect exposure.
increase acoustic exposure?
Increasing
frequency will not increase exposure.
3. To minimize the risk of biologic effects of Use M-mode instead of pulsed-wave Doppler to measure the fetal heart rate.
ultrasound to the fetus, which imaging
mode tradeoff would be most applicable? Pulsed wave Doppler increases the time average intensity compared to M-mode.
Heating
4. What potential bioeffect occurs through
absorption of sound energy by tissue? Sound attenuation in tissue is primarily due to absorption (conversion of ultrasound
to heat).
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).
5. When practicing universal precautions,
-wear gloves when there is a potential for contract with patient body fluid
you should do all the following EXCEPT:
-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 Is hospital-acquired
that:
1/11
, 7. Thermally induced biologic effects 1°C
should be preventable by avoiding a
local tissue temperature increase
exceeding:
SATA
8. Which intensity descriptor has the
lowest numeric value for the SATA, a term that is infrequently used, means spatial average, time average. Note:
characterization of a pulsed-wave I(SPTA) is the spatial peak, time average intensity; I(SPTP) is the spatial peak,
ultrasonic field? temporal peak.
9* Increased tissue heating could occur Increase transmit power
when you:
A study designed to determine if there is an Epidemiological study
association between an adverse effect in a
population and exposure to a particular
agent is an:
Reviewing your neighbors medical studies on your hospital PACS system so you can
give her your opinion of her condition
Which of the following actions is NOT
compliant w HIPPA? The Health Insurance Portability and Accountability Act (HIPPA) includes rules to
protect the privacy of the individuals health information. This answer would violate
HIPPA
The likelihood of cavitation during an ultrasound exam
What does the mechanical index indicate
on an ultrasound system? Mechanical index is derived from the peak rarefaction pressure and the ultrasound
freq, parameters shown to be associated w onset of cavitation
In medicine, what do the initials PHI Protected health information
indicate?
14*What should you limit when the thermal Exposure time
index exceeds 1?
15*To practice the ALARA principle, which Use the lowest transmit power that allows adequate tissue visualization
of the following techniques should you
employ? Use a high gain and low transmit power
Estimated temperature increase in tissue
Temperature increase is calculated assuming certain values for the absorption and
The thermal index indicates: thermal properties of tissues and taking into account factors such as beam
geometry, freq and power. Technically, it is the ratio of the power being produced
to the power needed for a 1° C temperature increase if tissues have the assumed
properties
Acoustic output (transmit) power
17*The operator control most directly
adjusts the intensity of the transmitted
Pulse repetition freq can also affect the intensity, specifically the I(SPTA) because it
pulse?
affects the duty factor
SPTP
Which of the following would show the
highest intensity value? Note that Im is the intensity over the half wave period within the transmit pulse where
it is the greatest! This term is seldom specified
Which intensity parameter is not SPPA and SAPA refer to pulse average intensities, which do not apply to continuous
applicable for continuous wave wave ultrasound.
ultrasound?
Which of the following would most likely PW doppler
have the highest SPTA value?
2/11
