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Flashcards in Ultrasound & Phonophoresis Deck (38)
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frequency of ultrasound is greater than blank hertz

20,000

1

generator of ultrasound has a blank circuit which produces electric current of specific frequency

oscillator

2

the blank inside the ultrasound is what creates the sound

crystal

3

a photon moves along the wave in this type of wave

electromagnetic

4

ultrasound waves do no have photons that move down the wave, instead they stay in the blank

same place

5

molecular flow occurs parallel to direction of wave propagation and is known as

micro something

6

size of the area of the transducer that radiates the ultrasound beam

effective radiation area

7

intensity can be either blank or blank

spatial, temporal

8

ratio of spatial peak intensity to the spatial average intensity

beam nonuniformity reatio

9

percent of time that the ultrasound beam is ON

duty cycle

10

number of compression rarefaction cycles per unit of time

frequency

11

lower frequencies go blank in tissue

deeper

12

absorption blank as frequency increases

increases

13

redirection of the ultrasound beam away from the surface

reflection

14

attenuation is higher for tissues with higher blank content

collagen

15

reflected wave interacts with incoming wave and creates summation causing discomfort

standing wave

16

formation, growth, and pulsation of bubbles exposed to ultrasound beam

cavitation

17

bubbles compress during this phase

compression

18

bubbles expand during this phase

rarefaction

19

cavitation where bubbles pop

unstable

20

two non thermal effects of ultrasound

cavitation, microstreaming

21

ultrasound travels faster through blank than blank

bone, air

22

any agent that allow for smooth transmission of ultrasound from sound head to tissue

couplant

23

best transmitters of ultrasound

water, gel

24

any mode of ultrasound causes blank effects

thermal

25

higher absorption blank causes a greater increase in temperature

coefficient

26

.5 intensity temp at 1 MHz, 3 MHz per minute in Celsius

.04, .3

27

1.0 intensity temp at 1 MHz, 3 MHz per minute in Celsius

.2, .6

28

1.5 intensity temp at 1 MHz, 3 MHz per minute in Celsius

.3, .9

29

2 intensity temp at 1 MHz, 3 MHz per minute in Celsius

.4, 1.4