Lesson 4 (Part 2) Flashcards Preview

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Flashcards in Lesson 4 (Part 2) Deck (18)
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1

What are the parameters for pulsed wave? (4)

1. Pulse repetition frequency
- PRF
2. Pulse repetition period
- PRP
3. Pulse duration
- PD
4. Duty factor
- DF

2

Pulse repetition frequency

Is the number of pulses per second

3

What is the unit for PRF?

KHz

4

Pulse repetition period

Is the time from the beginning of one pulse to the beginning of the next

5

What is the unit for PRP?

ms

6

What is the formula for PRF?

PRF = 1/PRP
- PRF = pulse repetition frequency
- PRP = pulse repetition period

7

What happens to the PRP if the PRF increases?

It decreases
- inversely proportionate

8

Pulse duration

Is the time that it takes for one pulse to occur

9

What does PD not include?

Downtime

10

What is the unit for PD?

us

11

What is the formula for PD?

PD = T x n
- PD = pulse duration
- T = time for one cycle
- n = number of cycles in a pulse

12

Duty factor

Is the fraction of the time the pulsed ultrasound is on

13

What is the formula for DF?

DF = PD/PRP x 100
- DF = duty factor
- PD = pulse duration
- PRP = pulse repetition period

14

What is the unit for DF?

Unitless
- can be expressed as a %

15

What is the DF usually for 2D?

1%

16

What is the DF usually for doppler?

5%

17

Spatial pulse length

Is the length of the pulse

18

What is the formula for SPL?

SPL = lambda x n
- SPL = spatial pulse length
- lambda = wavelength
- n = number of cycles