Chapter 4 and 5 quiz

Question 1

Rank these intensities from largest to smallest:

Answer 1

SPTS, SPPA, SPTA, SATP, SAPA, SATA

Question 2

SPTA is important regarding __________

Answer 2

Tissue heating

Question 3

Does an ultrasound beam have the same intensity at different locations?

Answer 3

No

Question 4

Deeper images creates ___________ listening, _________ PRP, _______ PRF, and ___________ duty factor.

Question 5

What is the minimum value for duty factor?

Answer 5

0%

Question 6

PRP and PRF are _______ related.

Answer 6

Inversely

Question 7

An ultrasound machine is imaging to a depth of 2 cm. Would the PRF be describes as high or low?

Answer 7

High

Question 8

How can a sonographer change the PRP?

Answer 8

Depth control

Question 9

Spatial pulse length is determined by ___________

Answer 9

Sound source and medium

Question 10

What characteristics create a long pulse duration?

Answer 10

Many cycles in a period or wavelength

Question 11

Which of these four values for PRF would have the longest PRP?
2 kHz
4000 Hz
6 Hz
1 kHz

Answer 11

6 Hz

Question 12

A sound beam travels a total of 10 cm in 2 seconds. What is the speed of the sound?

Answer 12

5 cm/sec

Question 13

What is the wavelength of a wave with an unknown frequency traveling in soft tissue?

Answer 13

0.51 mm

Question 14

By changing the imaging depth, which of the following does the operator also change ….

Answer 14

PRF, duty factor, and PRP

Question 15

Ultrasound is defined as a sound with a frequency of _________

Answer 15

Greater than 0.02 MHz

Question 16

Which of the following cannot be considered a unit of frequency?

Answer 16

Cycles

Question 17

What are the units of pulse duration?

Answer 17

Units of time (sec, years, etc)

Question 18

What determines the pulse duration?

Answer 18

The soundsource

Question 19

Two pulses are created by different transducers. The pulses have different durations. Which pulse is likely to create the best image?

Answer 19

The shorter duration pulse

Question 20

Using a specific transducer, what happens to the spatial pulse length at the sonographer increases the maximum imaging depth?

Question 21

Which of the following is a correct description of PRP?

Answer 21

The sum of the pulse’s “on” time and listening “off” time

Question 22

In diagnostic imaging, what determines the Spatial pulse length?

Question 23

What are the units of PRF?

Question 24

In diagnostic imaging, what establishes the PRF?

Answer 24

The source of the sound

Question 25

What is the value of the duty cycle for continuous wave ultrasound?
100
1%
1000%
none of the above

Answer 25

None of the above

Question 26

The PRF is the _____

Question 27

what is the importance of describing sound beam intensities in a variety of ways with regard to space and time?

Answer 27

It’s important when studying bioeffects

Question 28

Which intensity is most closely correlated to tissue heating?

Answer 28

SPTA