Flashcards in Optics Lecture 6 Deck (30):
Which modality to use for intraorbital features
Which modality to use to image cell morpholog
Which modality to use to image the epithelial layer
Which modality to use for quick pachymetry
Which modality to use to image the vitreous when corneal opacity is present
Which modality to use to image the ciliary body
Which modality to use to measure axial length with the BEST PRECISION
Optical low coherence interferometry
Is the a-scan quantitative or qualitative
What are the 3 axial data found from a-scan
Is the A-scan precise in measuring?
No, it is hard to be accurate
Is the b-scan quantitative or qualitative?
Acoustical modalities - what kind of waves?
Acoustical modalities - how is the penetration
Acoustical modalities - does it require immersion coupling
Yes - often a contact technique
Optical modalities - what kind of waves
Visible or infrared radiation
Optical modalities - how is the penetration?
Optical modalities - does it require immersion coupling?
No - no contact
Provides imaging of entire visual path
Does sound move faster or slower in air than water
Slower in air
Formula to use when comparing an ultrasound sys with a high frequency ultrasound sys
Multiply the MHz by axial resolution and divide by the other that only gave 1 number
Better resolution comes from what kind of wavelength
A or B scan to get numerical values
A or B scan to get morphology/shapes
Is the ultrasound reliable for measuring peripheral thickness?
What modality measures things behind the iris and can penetrate through tissue that is normally covered by optical opacities
Can you see behind the iris when using an optical modality?
How thick is average corneal thickness
In lasik, how thick is the flap on average
Why is optical low-coherence reflectometry better than a-scan
More precise, accurate measurements and better resolution