Interaction of sound & mediaCh 6 & Range equation Ch7

Question 1

Method of rating numbers. The numbers of 10’s that are multiplied to create the original number

Answer 1

Logarithm

Question 2

The strength of sound beams and brightness of images are measured in this unit

Answer 2

Decibel

Question 3

Reports relative changes and is a ratio with two intensities starting level and actual level

Answer 3

Decible notation

Question 4

3db

Answer 4

double

Question 5

-3db

Answer 5

half

Question 6

10db

Answer 6

ten times larger

Question 7

-10db

Answer 7

one tenth

Question 8

6db

Answer 8

four times larger

Question 9

-6db

Answer 9

one fourth

Question 10

Two factors that determine attenuation

Answer 10

Path length and frequency of sound

Question 11

How are distance and attenuation related?

Answer 11

Directly

Question 12

How are frequency and attenuation related?

Answer 12

Directly

Question 13

Is decibles relative or absolute change?

Answer 13

Relative

Question 14

Is attenuation relative or absolute change?

Answer 14

Relative

Question 15

longer distance

Answer 15

more attenuation

Question 16

higher frequency

Answer 16

more attenuation

Question 17

Shorter distance

Answer 17

less attenuation

Question 18

lower frequency

Answer 18

less attenuation

Question 19

Process that contribute to attenuation

Answer 19

Reflection, scattering, and absorption

Question 20

Reflection in only one direction with a smooth boundary

Answer 20

Specular reflection

Question 21

Irregular boundaries reflection that radiates in more than one direction

Answer 21

Diffuse reflection or backscatter

Question 22

Random redirection of sound in many directions

Answer 22

Scattering

Question 23

How are scattering and frequency related?

Answer 23

directly

Question 24

Scattering when the structure’s dimensions are much smaller than the beam’s wavelength . Scatters the sound wave in equally in all directions.

Answer 24

Rayleigh Scattering

Question 25

Which scatter results with an organized boundary?

Answer 25

specular or Rayleigh scatter

Question 26

Which scatter results with an unorganized boundary?

Answer 26

Diffuse or scattering

Question 27

Whats the significance of attenuation in diagnostic sonography?

Answer 27

Higher frequency produce shorter waves which create more accurate images. However higher freq attenuates more and is less capable of traveling far or deeper.

Question 28

When ultrasound is converted into another energy form like heat.

Answer 28

Absorption

Question 29

How are absorption and frequency related?

Answer 29

Directly

Question 30

The number of db of attenuation that occurs when sound travels one cm db/cm

Answer 30

Attenuation coefficient

Question 31

The constant value for the attenuation coefficient

Answer 31

2db/cm