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Ultrasound Physics > Chapter 10 > Flashcards

Chapter 10 Flashcards

Axial and lateral resolution

1
Q

T or F
Resolution is the ability to create accurate images

A

True

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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

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3
Q

Can axial resolution be adjustable

A

no

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4
Q

Shorter or longer pulses improve the axial resolution

A

Shorter

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5
Q

Axial resolution is related to

A

SPL, Pulse duration

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6
Q

formula for axial resolution

A

SPL / 2

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7
Q

Synonyms for axial resolution

A

Longitudinal
Axial
Range
Radial
Depth

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8
Q

A short pulse is created by what?

A

Less ringing (Damping Material)
Higher frequency

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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)

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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

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11
Q

Synonyms for lateral resolution

A

LATA
Lateral
Angular
Transverse
Azimuthal

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12
Q

Unit for Lateral Resolution

A

mm

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13
Q

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

A

True

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14
Q

Lateral resolution changes with what?

A

Depth

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15
Q

Beam diameter changes with what?

A

Depth

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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?

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

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)

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