Lesson 4 (Part 2) Flashcards
1
Q
What are the parameters for pulsed wave? (4)
A
- Pulse repetition frequency
- PRF - Pulse repetition period
- PRP - Pulse duration
- PD - Duty factor
- DF
2
Q
Pulse repetition frequency
A
Is the number of pulses per second
3
Q
What is the unit for PRF?
A
KHz
4
Q
Pulse repetition period
A
Is the time from the beginning of one pulse to the beginning of the next
5
Q
What is the unit for PRP?
A
ms
6
Q
What is the formula for PRF?
A
PRF = 1/PRP
- PRF = pulse repetition frequency
- PRP = pulse repetition period
7
Q
What happens to the PRP if the PRF increases?
A
It decreases
- inversely proportionate
8
Q
Pulse duration
A
Is the time that it takes for one pulse to occur
9
Q
What does PD not include?
A
Downtime
10
Q
What is the unit for PD?
A
us
11
Q
What is the formula for PD?
A
PD = T x n
- PD = pulse duration
- T = time for one cycle
- n = number of cycles in a pulse
12
Q
Duty factor
A
Is the fraction of the time the pulsed ultrasound is on
13
Q
What is the formula for DF?
A
DF = PD/PRP x 100
- DF = duty factor
- PD = pulse duration
- PRP = pulse repetition period
14
Q
What is the unit for DF?
A
Unitless
- can be expressed as a %
15
Q
What is the DF usually for 2D?
A
1%
