Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Ultrasound Physics > Chapter 10 > Flashcards

Chapter 10 Flashcards

Axial and lateral resolution

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
1
Q

T or F
Resolution is the ability to create accurate images

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

The ability to distinguish 2 structures that are close to each other, front and back, parallel to or along the beam’s main axis

A

Axial resolution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Can axial resolution be adjustable

A

no

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Shorter or longer pulses improve the axial resolution

A

Shorter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Axial resolution is related to

A

SPL, Pulse duration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

formula for axial resolution

A

SPL / 2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Synonyms for axial resolution

A

Longitudinal
Axial
Range
Radial
Depth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

A short pulse is created by what?

A

Less ringing (Damping Material)
Higher frequency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Better axial resolution is associated with what?

A

Short SPL
Short PD
Short Wave Length
Less no of cycles(less ringing)
Lower Numerical Values
Higher Frequency(shorter wavelength)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

The minimum distance that 2 structures are separated by side to side or perpendicular to the sound beam that produces 2 distinct echoes

A

Lateral Resolution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Synonyms for lateral resolution

A

LATA
Lateral
Angular
Transverse
Azimuthal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Unit for Lateral Resolution

A

mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Lateral resolution is determined by the width of the sound beam, narrower beams have better resolution (T or F)

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Lateral resolution changes with what?

A

Depth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Beam diameter changes with what?

A

Depth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Lateral resolution is equal to what

A

Beam diameter

17
Q

As the beam varies with depth what happens to the lateral resolution?

A

it widens

18
Q

Lateral resolution is best at where?

A

Focus, where the beam is narrower

19
Q

Which frequency improve both axial and lateral resolution?

A

Higher frequency

20
Q

Fixed focusing is also known as

A

Conventional or mechanical focusing

21
Q

Effects of focussing

A
  1. Beam diameter in near field and focal zone is reduced.
  2. Focal depth is shallower.
  3. Beam diameter in the far zone increases.
  4. Focal zone is smaller.
22
Q

Beam divergence is determined by what?

A

Diameter of ceramic and frequency of sound

23
Q

Focal length is determined by what?

A

Diameter of ceramic and frequency of sound.

24
Q

Lateral resolution is determined by what?

A

Beam width

25
Q

Frequency of Pulsed wave was determined by what?

A

Thickness of crystal
speed of sound in crystal

26
Q

Internal focussing

A

with a curved active element

27
Q

External focussing

A

Lens

28
Q

Phased array focussing

A

with electronics of the ultrasound system

29
Q

Fixed focussing also known as

A

Conventional or Mechanical focusing

30
Q

Electronic Phased array

A

Adjustable and Multiple focusing

Ultrasound Physics (11 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions