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Physics 1 > Lesson 18 (Part 1) > Flashcards

Lesson 18 (Part 1) Flashcards

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1
Q

Resolution (2)

A
  1. To create a better picture

2. Being able to separate distinct echoes

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2
Q

What are 3 examples imaging resolution?

A
  1. Detail/spatial
    - transducer
  2. Contrast
    - instrument
  3. Temporal
    - instrument
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3
Q

What kind of resolution is better?

A

Smaller

- tinier details can be discerned

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4
Q

What happens if 2 reflectors are not separated sufficiently?

A

They produce overlapping echoes

- smear

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5
Q

What is axial resolution also known as? (4)

A
  1. Longitudinal
  2. Radial
  3. Depth
  4. Range
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6
Q

Axial resolution

A

Minimum reflector separation along scan lines to produce separate echoes

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7
Q

What happens to the image when distance between the structures is greater than the axial resolution?

A

It will appear as a single structure

- smear

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8
Q

What happens to the image when the distance between the structures is lower than the axial resolution?

A

You will get separate structures

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9
Q

What is the formula for axial resolution?

A

AR = SPL/2

  • AR = axial resolution
  • SPL - spatial pulse length
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10
Q

How do you get the best axial resolution?

A

Smaller SPL

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11
Q

What is the unit for axial resolution?

A

mm

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12
Q

How do we reduce SPL? (3)

A
  1. Reducing the number of cycles
  2. Reducing the wavelength
  3. Increase frequency
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13
Q

How do you reduce the number of cycles?

A

Applying damping

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14
Q

What does increasing frequency affect?

A

Penetration

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15
Q

What is lateral resolution also known as? (3)

A
  1. Angular
  2. Transverse
  3. Azimuthal
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16
Q

Lateral resolution

A

Minimum reflector separation perpendicular to scan line to produce separate echoes
- horizontal line

17
Q

What is the formula for lateral resolution?

A

LR = Wb

  • LR = lateral resolution
  • Wb = width of beam
18
Q

What is the unit for lateral resolution?

A

mm

19
Q

What happens in lateral resolution of the resolution is too high?

A

You get a smearing effect

20
Q

What happens if the beam is narrower than reflector separation in lateral resolution?

A

You get 2 distinct structures

21
Q

What is the lateral resolution at the focus?

A

Same as what is the beam width at the focus

22
Q

What is the formula for beam width?

A

1/2 of the aperture

23
Q

What is the best lateral resolution?

A

The smaller the better

24
Q

How is lateral resolution improved?

A

By reducing beam width

25
Q

How can you reduce the beam width in lateral resolution?

A

By adjusting the focus

- making it more narrower

26
Q

Where can you move the focus?

A

Near zone length

- NZL

27
Q

Where cant you move the focus?

A

Far zone length

28
Q

What can you change in the FZL?

A

Aperture size

Physics 1 (42 decks)

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