SONO Unit 2

Question 1

What is a pulse in ultrasound?

Answer 1

A collection of cycles that travel together

Question 2

What are the two components of a pulse?

Answer 2

The on and off time

Question 3

What is pulse duration?

Answer 3

Time from the start to the end of a pulse or the talking time

Question 4

What determines pulse duration?

Answer 4

Sound source

Question 5

Is pulse duration adjustable?

Answer 5

No

Question 6

What equation defines pulse duration?

Answer 6

PD= # of cycles x period

Question 7

What kind of pulse gives better image quality?

Answer 7

shorter pulse duration

Question 8

What is SPL?

Answer 8

Distance from the start to the end of a pulse.

Question 9

What determines SPL?

Answer 9

Source and medium

Question 10

What equation defines SPL?

Answer 10

SPL= # of cycles x wavelength

Question 11

What kind of SPLF gives better image quality?

Answer 11

Shorter SPL

Question 12

What is PRP?

Answer 12

Time from the start of one pulse to the start of the next

Question 13

What determines PRP?

Answer 13

Sound source

Question 14

Is PRP adjustable?

Answer 14

Yes, by changing depth.

Question 15

How is PRP related to depth?

Answer 15

Directly

Question 16

What is PRF?

Answer 16

Number of pulses transmitted per second

Question 17

What determines PRF?

Answer 17

Sound source

Question 18

Is PRF adjustable?

Answer 18

Yes, by depth

Question 19

How is PRF related to depth?

Answer 19

Inversely related

Question 20

How are PRP and PRF related?

Answer 20

They are reciprocals

Question 21

What is the equation linking PRP and PRF?

Answer 21

PRF= 1/PRP and PRP x PRF=1

Question 22

What is duty factor?

Answer 22

Percentage of time the machine is producing a pulse?

Question 23

What determines duty factor?

Answer 23

sound source

Question 24

Is duty factor adjustable?

Answer 24

Yes, by depth

Question 25

What is the equation for duty factor?

Answer 25

DF= PD/PRP x 100

Question 26

What is the typical duty factor in diagnostic imaging?

Answer 26

0.2-0.5%