Chapter 7

Question 1

ALARA

Answer 1

A principle that is prudent to obtain diagnostic information with the least amount possible of energy exposure to the patient.

Question 2

Cavitation

Answer 2

Production and dynamics of bubbles in sound

Question 3

Hydrophone

Answer 3

a device which will listen to, or pick up, the acoustic energy underwater

Question 4

Mechanical Index

Answer 4

An indicator of nonthermal mechanism activity; equal to the peak rarefaction pressure divided by the square root of the center frequency of the pulse.

Question 5

Phantom

Answer 5

Tissue equivalent device that has characteristics that are representative of tissues

Question 6

Polyvinylidene Flouride

Answer 6

A piezoelectric thinning material

Question 7

Radiation Force

Answer 7

The force exerted by a sound beam on an absorber or reflector

Question 8

Test Object

Answer 8

Something that does not simulate tissue like characteristics. They do provide some specific measure of instrument performance.

Question 9

Thermal Index

Answer 9

An indicator of thermal mechanism activity