The flashcards below were created by user
amadaperedo
on FreezingBlue Flashcards.
-
What action below would be most keeping with the ALARA principle while performing a diagnostic ultrasound examination?
Complete 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?
Increase transmitting power
-
While performing a sonogram, to minimize risk to the fetus, which imaging mode tradeoff would be most applicable?
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?
Heating
-
When practicing universal precautions, you should do all of the following EXCEPT:
Wash gloves between exams for reuse from one patient to another.
-
A nosocomial infection is defined as one that is:
Hospital acquired.
-
Thermally induced biological effects should be preventable by avoiding a local tissue temperature increase exceeding:
1° C
-
Which intensity descriptor has the lowest numerical value for the characterization of pulsed-wave ultrasonic field?
SATA
-
Increased tissue heating could occur when you:
Increases 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 an?
Epidemiological study
-
Which of the following action is not compliant with HIPAA?
Reviewing your neighbor's medical studies on you hospital PACS system so you can give her your opinion of her condition
-
What does the mechanical index indicate on an ultrasound system?
The likelihood of cavitation during an ultrasound exam
-
In medicine, what do the initial PHI indicated?
Protected health information
-
What should you limit when the thermal index exceeds 1°?
Exposure time
-
To practice the ALARA principle, which of the following techniques should you employ?
Use the lowest transmit power that allows adequate tissue visualization.
-
The thermal index indicates:
Estimated temperature increase in tissue
-
Which operator control most directly adjusts the intensity of the transmitted pulse?
Acoustic output transmit power
-
Which of the following would show the highest intensity value?
SPTP
-
Which intensity parameter is not applicable for continuous-wave ultrasound?
SPPA and SAPA
-
Which of the following would most likely have the highest SPTA value?
PW Doppler
-
Using a hydrophone, you can measure:
Pressure amplitude and Duty factor
-
Which of the following parameters relates to tissue heating?
Absorption
-
Which of the following occurs when you use the maximum system gain? Increase tissue heating. Increase risk of cavitation. Fluid particle streaming. Increased sound absorption.
None of the above
-
You are performing a sonogram and notice that the thermal index (TI) is greater than 1. Any increase in a temperature would be greatest in:
Bone
-
The motion of particles in a fluid is sometimes observed in an intense ultrasound beam. This is termed:
Acoustic streaming
-
You are performing a sonogram and notice that the TI reading is 1. What does this indicate?
The output limit is high enough that temperature could increase as much as 1°C if the transducer were held stationary.
-
What sonographic application has the lowest FDA-approved SPTA values?
Ophthalmic
-
The following advantage is associated with use of the MI and TI indices:
Information is available on the screen to help the sonographer implement the ALARA principle.
-
When scanning with pulsed-wave Doppler, you would affect the acoustic exposure by changing which of the following?
Pulse repetition frequency
-
What should you do to avoid nosocomial and cross-infection with sonographic probes?
Probe cleaning should always precede high level disinfection.Disinfection using a germicide compatible with the tranducer is indicated when the probe is in contact with mucous membranes.
|
|