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Flashcards in Ex2 Deck (26)
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1

Ultrasound uses what kind of energy?

Acoustical

2

What is the most common DEEP heating modality used by 63% of all chiropractors ?

Ultrasound

3

What is the the 2nd most common heating modality used ?

Ultrasound

4

What is the most Common heating modality used by 71% of chiropractors ?

Moist hot pack

5

What is the range of hz in ultrasound ?

.8-3.3 MHz

6

What duty cycles are commonly used for pulsed ultrasound?

50% and 20%

7

What kind of ultra sound is used for tissue healing ?

Continuous

8

What kind of ultrasound has a non thermal effect but has mechanical effects?

Pulsed ultrasound

9

What effect is described as a mechanical deformation of a crystal that causes an electrolyte current to form?

Piezoelectric effect

10

What effect is an alternating current is passsed through a crystal rustling in very fast contraction and expansion of the crystal?

Reverse piezoelectric (indirect) effect

11

What is needed for a reverse piezoelectric effect?

High voltage cables that are well insulated

12

What is associated with near field ultrasound beams?

Treatment area, fresnel zone

13

What ultrasound beam is associated with far field ?

Fraunhofer zone

14

What type of ultrasound is used as stimulation of Fracture healing ?

Low intensity pulsed US (LIPUS)

15

What type of US propels sterile saline across the wound which is used to clean and Debrid wounds?

Noncontact low frequency ultrasound (NCLFUS)

16

What does ERA stand for?

Effective radiating area

17

What does BNR stand for?

Beam nonuniformity ratio

18

What is the size of the ERA?

Always smaller than the size of the ultrasound head (ideally only slightly smaller)

19

What is the area of the sound head that prides sound energy/?

Effective radiating area? (ERA)

20

Are ultrasound beams uniform across the US head?

No

21

What measures the amount of variability of the beam?

Bean nonuniformity ratio (BNR)

22

How do you figure out the BNR?

Ratio between the peak intensity of the ultrasound beam divide by the average intensity of the ultrasound

23

What is used to compare quality of different US machines?

BNR (beam nonuniformity ratio)

24

What is the ideal BNR?

1:1

25

What, although not ideal is the range for BNR?

2:1-8-1

26

The______the BNR the more uniform the intensity of the sound wave?

Lower