Ultrasound

Question 0

US intensities range from _ to_ w/cm2

Answer 0

.1-3

Question 1

US is a form of _______ energy.

Answer 1

Acoustic

Question 2

_w/cm2 is the highest intensity you would use for US

Answer 2

2

Question 3

Higher frequencies penetrate ____ more/less deep

Answer 3

Less

Question 4

Distance between two peaks in a pressure wave is known as what?

Answer 4

Wavelength

Question 5

Average soft tissue velocity in ultrasound is ____m/sec

Answer 5

1540

Question 6

Tissues with a high protein content have a high/low absorption rate?

Answer 6

High

Question 7

Amplitude is measured in ______/meter2

Answer 7

Newtons

Question 8

Averaging the power of the on and off times will give you a measure of what?

Answer 8

Temporal averaged intensity

Question 9

Spatial averaged intensity is the measure of the intensity over what? And is measured in what?

Answer 9

The area of the transducer.

W/cm2

Question 10

Intensities above ___W/cm2 destroy tissues

Answer 10

10w/cm2

Question 11

The depth at which half of the ultrasound has been absorbed is called what?

Answer 11

Half value thickness

Question 12

Beam non-uniformity ratio determines the equality of distribution on the US head. The BNR needs to be between _ and _.

Answer 12

2 and 6

Question 13

True/false- ultrasound head can be left unmoving if duty cycle is at 50% or lower

Answer 13

True

Question 14

_______ stays in the body longer than other forms of heat.

Answer 14

Diathermy