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Block 8 > Optics Lecture 6 > Flashcards

Optics Lecture 6 Flashcards

1
Q

Which modality to use for intraorbital features

A

MRI

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2
Q

Which modality to use to image cell morpholog

A

Confocal microscopy

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3
Q

Which modality to use to image the epithelial layer

A

Ultrasound biomicroscopy

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4
Q

Which modality to use for quick pachymetry

A

Ultrasound

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5
Q

Which modality to use to image the vitreous when corneal opacity is present

A

Ultrasound biomicroscopy

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6
Q

Which modality to use to image the ciliary body

A

Ultrasound biomicroscopy

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7
Q

Which modality to use to measure axial length with the BEST PRECISION

A

Optical low coherence interferometry

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8
Q

Is the a-scan quantitative or qualitative

A

Quantitative

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9
Q

What are the 3 axial data found from a-scan

A

Axial length
AC depth
Corneal thickness

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10
Q

Is the A-scan precise in measuring?

A

No, it is hard to be accurate

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11
Q

Is the b-scan quantitative or qualitative?

A

Qualitative

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12
Q

Acoustical modalities - what kind of waves?

A

Ultrasound

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13
Q

Acoustical modalities - how is the penetration

A

Good

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14
Q

Acoustical modalities - does it require immersion coupling

A

Yes - often a contact technique

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15
Q

Optical modalities - what kind of waves

A

Visible or infrared radiation

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16
Q

Optical modalities - how is the penetration?

A

Poor

17
Q

Optical modalities - does it require immersion coupling?

A

No - no contact

18
Q

Provides imaging of entire visual path

A

MRI

19
Q

Does sound move faster or slower in air than water

A

Slower in air

20
Q

Formula to use when comparing an ultrasound sys with a high frequency ultrasound sys

A

Multiply the MHz by axial resolution and divide by the other that only gave 1 number

21
Q

Better resolution comes from what kind of wavelength

A

Shorter

22
Q

A or B scan to get numerical values

A

A scan

23
Q

A or B scan to get morphology/shapes

A

B scan

24
Q

Is the ultrasound reliable for measuring peripheral thickness?

A

No

25
Q

What modality measures things behind the iris and can penetrate through tissue that is normally covered by optical opacities

A

Ultrasound biomicroscopy

26
Q

Can you see behind the iris when using an optical modality?

A

No

27
Q

How thick is average corneal thickness

A

55-60 microns

28
Q

In lasik, how thick is the flap on average

A

120 microns

29
Q

Why is optical low-coherence reflectometry better than a-scan

A

More precise, accurate measurements and better resolution

30
Q

Average axial length

A

22-24 mm

Block 8 (11 decks)

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