Match the items.
a. W/cm2
b. minutes
c. cm2
d. MHz
e. Celsius
1. dosage
2. frequency
3. transducer size (ERA)
4. time
5. temperature
Pulsed ultrasound is produced by continuous supply of electrical energy to the sound head
True
False
A PTA is working with a patient who experienced wrist sprain 4 days ago. The patient presents for treatment with mild redness, 4cm girth difference between R and L wrist, and the wrist is warm to the touch.
Which of the following parameters is the BEST choice for using ultrasound with this patient?
a. O.5 W/cm2 x 5 minutes @ 20%
b. 1.5 W/cm2 x 5 minutes @100%
c. 0.5 W/cm2 x 12 min @ 50%
d. 1.5 W/cm2 x 5 minutes @ 20%
Which of the following statements is the MOST accurate regarding ERA and ultrasound?
a. treatment area should be approximately twice the size of the ERA of the transducer
b. ERA should be at least 6:1 to prevent hot spots
c. ERA describes the point of maximum intensity of sound energy
Different tissues become heated in proportion to their density. Therefore soft tissue is more likely than bone to heat in response to ultrasound
During ultrasound, muscles are more likely to heat than ligaments and tendons
All of the following are contraindications to ultrasound EXCEPT
a. open wound with drainage
b. cancer diagnosis
c. sensory loss
d. deep vein thrombosis
e. use over implanted electrical device
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