ultrasound Flashcards
1
Q
therapeutic ultrasound
A
-is a deep heating modality using US to primarily elevate tissue temperatures
2
Q
medical US has a frequency of..
A
0.5-5.0
3
Q
therapeutic US has a frequnency of..
A
0.7-3.3 MHz to maximize energy absorption at a depth of 2 to 5cm of soft tissue
4
Q
continuous US
A
- CUS
- continuous delivery of US throughout the treatment period
- thermal effect
5
Q
Pulsed US
A
PUS
- DElivery of US suring only a portion of treatment period
- non-thermal effect
6
Q
duty cycle
A
- the proportion of the total treatment time that the US is on. this can be expressed wither as a percentage or a ration.
7
Q
3mHz
A
= higher frequency = faster, higher temp, shallow tissue depth
8
Q
1 MHz
A
= lower frequency = slower, lower temp, deeper tissue depth
9
Q
soft tissue response to US
temp increase how much
A
- increase 0.2 deg C per minute of US delivered at 1W/cm2 at 1MHz
10
Q
therapeutic temperature Range
A
- 41 deg C to 45 deg C
- or 106.0 F
11
Q
thermal effects from using US
A
- increased metabolic rate
- reduction or control of pain
- reduction or control of muscle spasm
- increase nerve conduction velocity
- increase circulation
- increased softtissue extensibility
12
Q
non-thermal effects of US
A
- increased intracellular calcium
- increased skin and cell membrane permeability
- increased mast cell degranulation
- increase chemotactic factor and histamine release
- increased macrophage responsiveness
- increased rate of protein synthesis by fibroblasts
13
Q
US for soft tissue shortening
A
- CUS
- 0.5- 1.0 power is 3MHz
- 1.5-2.5 power is 1 MHz
- time 5-10 minutes
stretch during and after US application for 5 to 10 minutes
14
Q
US for pain control
A
- CUS
- freq 1 MHz
- Power 0.5-2 W/cm2
- 5-10 minutes
15
Q
US for calcific tendinitis of the shoulder
A
- CUS
- 1 or 3 MHz
- 1-2 w/cm2
- 10 minutes
- 10 minutes for 4-8 weeks
