ultrasound Flashcards
1
Q
ultrasound definition
A
- type of sound waves transmitting energy by alternating compression and rarefying material
- 20,000 cycles per sound
- 0.7 - 3.3 MHz
2
Q
thermal effects
A
- increase temp of deep and superficial tissues
3
Q
non thermal effects
A
- ^ intracellular calcium levels
- ^ skin and cell membranes permeability
- ## ^ mast cell permeability
4
Q
thermal
A
- continuous has greater effect on temp
- reaches deeper with smaller area
- tissues have different absorption coefficients
5
Q
application speed
A
2-8 cm per second
6
Q
contraindications of US
A
- malignant tumor
- pregnancy (only where the baby is)
- CNS tissue
- methyl methacrylate cement or plastic
- pacemaker (not within 6 inches)
- thrombophlebitis
- eyes
- reproductive organs
7
Q
precautions of US
A
- acute inflammation
- epiphyseal plates
- fractures
- breast implants
8
Q
adverse effects
A
- burn (usually under the skin)
- banding and plasma
- status of blood flow
- cross contamination
9
Q
safeguards
A
- infection control
- don’t use defective equipment
- confirm presence of contra and precautions
- best therapeutic and safe parameters based on target tissue
- follow guidelines
- stop if any adverse effect is reported
