9. Bioeffects Flashcards
Heating depends most directly on ______
a. SATA intensity
b. SATP intensity
c. SPTP intensity
d. pressure
a. SATA intensity
Conditions under which cavitation may occur are best described by _____.
a. SATA intensity
b. SATP intensity
c. SPTP intensity
d. peak rarefactional pressure
d. peak rarefactional pressure
Bioeffects have been observed in experimental animals with intensities greater than _____.
a. 100 mW/cm2 SPTA
b. 1 W/cm2 SPTA
c. 10 W/cm2 SPTA
d. 1 mW/cm2 SPTP
e. 10 mW/cm2 SPTP
a. 100 mW/cm2 SPTA
Bioeffects have been observed in experimental animals with focused intensities greater than _____.
a. 100 mW/cm SPTA
b. 1 W/cm SPTA
c. 10 W/cm SPTA
d. 1 mW/cm SPTP
b. 1 W/cm SPTA
Focal lesions have been observed in experimental animals with intensities greater than ______.
a. 100 mW/cm SPTA
b. 1 W/cm SPTA
c. 10 W/cm SPTA
d. 1 mW/cm SPTP
e. 10 mW/cm SPTP
c. 10 W/cm SPTA
The available epidemiologic data are sufficient to make a final judgment on the safety of diagnostic ultrasound. T or F?
False
Exposure is minimized by using diagnostic ultrasound _____.
a. only when indicated
b. with minimum intensity
c. with minimum time
d. all of the above
e. none of the above
d. all of the above
Which of the following is (are) used currently to indicate output on the display?
a. percent
b. decibel
c. SPTA intensity
d. mechanical index
e. all of the above
e. all of the above
Which of the following affect(s) exposure of a fetus?
a. intensity at the transducer
b. distance to the fetus
c. frequency
d. gain
e. more than one of the above
f. all of the above
e. more than one of the above (a, b, c)
There is no possible hazard involved in the use of diagnostic ultrasound. T or F?
False
Ultrasound should not be used as a diagnostic tool because of the bioeffects it can produce. T or F?
False
