Ultra Sound Flashcards
1
Q
What are thermal effects of US?
A
heat tissue with high collagen content such as tendons , ligaments joints.
increase collagen extensibility
2
Q
How does US work?
A
- high frequency electrical current is applied to a crystal in the US head
- hits the crystal and causes it to make sound waves
3
Q
What setting is applied for nonthermal US?
A
-pulsed 20%
4
Q
Two reasons heat can reduce pain?
A
gate theory
blood flow disrupting pain cycle
5
Q
What is duty cycle?
A
The total time US is used %
6
Q
What are the common frequencies for US?
A
1MHz-5cm
3MHz-1-2 cm
7
Q
Phonophoresis?
A
Prescription for topical application with US machine.
8
Q
What are contraindications for US?
A
- malignant tumor
- pregnancy
- CNS tissue
- Joint cement
- plastic components
- Pacemaker
- Thrombophlebitis
- Eyes
- Reproductive organs
9
Q
What are precautions for use of US?
A
Acute inflammation
epiphysial plates
10
Q
What do you need to document for ultrasound
A
- side
- body part
- positioning/ stretch
- intensity, duty cycle, frequency
