Chap 4- Edelmans (Pulsed Waves)

Which of these four values for pulse repetition frequency would have the longest pulse repetition period?

6 Hz

Four pulses have pulse repetition periods as listed below. Which of the following four waves has the highest pulse repetition frequency?

5 ms

Which of the four pulses with PRFs listed below has the shortest pulse repetition period?

20 kHz

Four waves have pulse repetition periods as listed below. Which of the following four waves haas the lowest pulse repetition frequency?

8 s

True or False. Two waves can have identical pulse repetition frequencies, even if their pulse repetition periods are different.

False

True or False. Two waves can have identical PRFs, even if their periods are different.

True

True or False. Two waves can have identical PRFs, even if their frequencies are different.

True

True or False. PRF and pulse repetition period are determined only by the imaging depth.

True

If all other factors remain unchanged, what happens to the duty factor when PRF increases?

increases

If all other factors remain unchanged, what happens to the DF when PRP increases?

decreases

If all other factors remain unchanged, what happens to the DF when the imaging depth increases

decreases

If all other factors remain unchanged, what happens to the DF when a sonographer uses a new transducer with a longer pulse duration?

increases

What is he DF if the PD is 1 microsecond and the PRP is 1 ms?

0.001

Which of the following terms does not belong with the others?

low PRF

Which of the following terms does not belong with the others?

shallow imaging

____ is the time from the start of ne pulse to the end of that pulse

pulse duration

_____ is the time from the start of a pulse to the start of the next pulse

Pulse repetition frequency is the reciprocal of ____

PRP

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

a. PRF

b. DF

c. propagation speed

d. PRP

e. amplitude

f. SPL

A, B, D

The speed of 5 MHz CW is 1.8km/sec. The wave is then pulsed with a DF of 0.5/ Calculate the new propagation speed

the same

What is the DF if the PD is 1 microsecond, the PRP is 1 ms.

10^-3 or 0.001

What is the DF if the PD is 1 millisecond, and the PRP is 1 second.

0,001

A sonographer adjusts the depth of view of an US scan from 8cm to 16cm. Whaat parameters increase?

a. period

b. frequency

c. wavelength

d. speed

e. amplitude (inital)

f. PD

g. PRF

h. DF

I. SPL

J. PRP

PRP

A sonographer adjusts the depth of view of an US scan from 8cm to 16cm. Whaat parameters remain the same?

a. period

b. frequency

c. wavelength

d. speed

e. amplitude (inital)

f. PD

g. PRF

h. DF

I. SPL

J. PRP

A, B, C, D, E, F, I

A sonographer using a 3 MHz transducer changes to a 6 MHz transducer. The imaging depth remains unchanged. What would increase?

a. period

b. frequency

c. wavelength

d. speed

e. intensity (initial)

f. PRF

g. PRP

B

A sonographer using a 3 MHz transducer changes to a 6 MHz transducer. The imaging depth remains unchanged. What would decrease?

a. period

b. frequency

c. wavelength

d. speed

e. intensity (initial)

f. PRF

g. PRP

A, C

A sonographer using a 3 MHz transducer changes to a 6 MHz transducer. The imaging depth remains unchanged. What would remain the same?

a. period

b. frequency

c. wavelength

d. speed

e. intensity (initial)

f. PRF

g. PRP

D, E, F, G

A sonographer using a 3 MHz transducer increases the power output to visualize structures that are positioned deeper in the pt. No other controls are adjusted. Which parameter(s) would increase?

a. period

b. frequency

c. wavelength

d. speed

e. power (initial)

f. inensity (initial)

g. PD

h. PRF

i. DF

j. SPL

k. PRP

E, F

A sonographer using a 3 MHz transducer increases the power output to visualize structures that are positioned deeper in the pt. No other controls are adjusted. Which parameter(s) would decrease?

a. period

b. frequency

c. wavelength

d. speed

e. power (initial)

f. inensity (initial)

g. PD

h. PRF

i. DF

j. SPL

k. PRP

none

A sonographer using a 3 MHz transducer increases the power output to visualize structures that are positioned deeper in the pt. No other controls are adjusted. Which parameter(s) would remain the same?

a. period

b. frequency

c. wavelength

d. speed

e. power (initial)

f. intensity (initial)

g. PD

h. PRF

i. DF

j. SPL

k. PRP

A, B, C, D, G, H, I, J, K