Relationships

Question 1

frequency - wavelength

Answer 1

indirect

as frequency increases, wavelength decreases

Question 2

PRP - PRF

Answer 2

indirect

as PRP increase, PRF decreases

Question 3

frequency - penetration

Answer 3

indirect

as frequency decreases, penetration increases (using a 3MHz xducer for a fatty liver)

Question 4

wavelength - propagation speed

Answer 4

direct

as wavelength increases, frequency increases

Question 5

frequency - attenuation

Answer 5

direct

as frequency increases, attenuation increases

Question 6

path length - attenuation

Answer 6

direct

as path length increases, attenuation increases

Question 7

intensity - power

Answer 7

direct

as power increases, intensity increases

Question 8

intensity - amplitude

Answer 8

direct

• if amp is doubled, intensity is increased by 4 times
• if amp is quartered, the intensity is reduced to 1/16th of its original value

Question 9

Wavelength

Define:
Units:
Determined by:
Changed by sonographer?

Answer 9

Define: distance of a single cycle

Units: meters

Determined by: source and the medium

Changed by sonographer? no

Question 10

Propagation Speed

Define:
Units:
Determined by:
Changed by sonographer?

Answer 10

Define: rate that sound travels

Units: meters per second

Determined by: medium (density and stiffness)

Changed by sonographer? no

Question 11

List prop speed in order of slow to fast

Answer 11

gas (slow)
liquid
solid (fast)

Question 12

What is the propagation speed of sound in soft tissue in:
km/s
m/s
mm/microsecond

Answer 12

1.54 km/s

1540 m/s

1.54 mm/microsecond

Question 13

Interference

Answer 13

when two waves overlap at the same location at the same time, they combine and form a new wave

Question 14

Constructive Interference

Answer 14

When the amplitude of a new wave is greater than the original two waves. *IN-PHASE WAVES)

Question 15

Destructive Interference

Answer 15

When the amplitude of the new wave is less than the original waves. *OUT-OF-PHASE WAVES