Patient Care and Safety

Question 1

Which intensity descriptor has the lowest numerical value for the characterization of a pulsed-wave ultrasonic field?

Answer 1

SATA

Question 2

What does the mechanical index indicate on an ultrasound system?

Answer 2

The likelihood of cavitation during an ultrasound exam

Question 3

Which operator control most directly adjusts the intensity of the transmitted pulse?

Answer 3

Acoustic output (transmit) power

Question 4

Which of the following would show the highest intensity value?
SATP, SATA, Im, SPPA, SPTP

Answer 4

SPTP

Question 5

Which intensity parameter is not applicable for continuous-wave ultrasound?
SATA, SPTA, SPPA, SAPA, C AND D

Answer 5

C AND D Refer to pulse average intensities, which do not apply to continuous wave ultrasound

Question 6

When scanning with pulsed-wave doppler, you would affect the acoustic exposure by changing which of the following
Doppler gain, high pass filter, pulse repetition frequency, baseline position, doppler angle

Answer 6

pulse repitition frequency

Question 7

When you change the transmit frequency, which of the following is altered?

Answer 7

Number of cycles per second

Question 8

Wavelength depends on what two factors?

Answer 8

frequency and propagation speed

Question 9

what human tissue has the highest rate of attenuation of an ultrasound wave?

Answer 9

Lung

Question 10

The propagation speed for sound is lowest in which of the following biological tissues?

Answer 10

Fat