AXIAL RESOLUTION

Question 1

What measures the ability of a system to display two closely spaced structures when they are parallel to the sound beam’s axis?

Answer 1

Axial resolution

Question 2

What are the units for Axial resolution?

Answer 2

Units of distance

Question 3

What is axial resolution determined by?

Answer 3

Spatial pulse distance

Question 4

What is spatial pulse length determined by?

Answer 4

both sound source and medium

Question 5

Does a shorter or longer pulse improve axial resolution?

Answer 5

shorter pulses

Question 6

True or False, axial resolution is related to pulse duration?

Answer 6

True

Question 7

What are other terms for axial resolution?

Answer 7

1. Longitudinal
2. Axial
3. Range
4. Radial
5. Depth Resolution

Question 8

Is axial resolution adjustable?

Answer 8

No

Question 9

What is the mnemonic for axial resolution?

Answer 9

LARRD

Question 10

Does a lower numerical value of axial resolution indicate a shorter or longer pulses?

Answer 10

shorter pulses

Question 11

Do longer or shorter pulses create a more accurate image?

Answer 11

shorter pulses

Question 12

What is the axial resolution equation in soft tissue?

Answer 12

0.77 x # of cycles ÷ f (frequency)

Question 13

How is axial resolution determined?

Answer 13

Pulse length

Question 14

How are shorter pulses created?

Answer 14

Higher frequency = less ringing

Question 15

True or False, a way to reduce ringing is to dampen the crystal before it has been excited?

Answer 15

False, to reduce ringing, is to dampen the crystal AFTER it has been excited by the electrical signal.

Question 16

Are shorter wavelength a characteristic of higher or lower frequencies?

Answer 16

Higher