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img crit ch 30

image critique - recorded detail and spatial resolution

QuestionAnswer
What is the unit for screen film resolution? line pairs per mm
How is resolution determined with line pairs for screen film? more line pairs means better resolution
Term for recorded detail in digital imaging? spatial resolution
What determines spatial resolution? matrix size, pixel size, gray scale, bit depth
What is the Z-axis? gray scale, represents depth to the information in the image (bit depth)
X and Y grid matrix make up the spatial resolution because they represent points in space
High frequency is what kind of wavelength? short wavelength
Define gray scale as relating to spatial resolution the number of shades of gray that can be displayed by each pixel
High spatial resolution correlates with _____ object size? small
High spatial resolution correlates with _____ OID? small (close)
High spatial resolution correlates with _____ unit of measure? high Lp/mm
High spatial resolution correlates with _____ MTF? high
High spatial resolution correlates with _____ PSF? low
Low spatial resolution correlates with _____ object size? large
Low spatial resolution correlates with _____ OID? large (distant)
Low spatial resolution correlates with _____ unit of measure? low Lp/mm
Low spatial resolution correlates with _____ MTF? low
Low spatial resolution correlates with _____ PSF? high
Nyquest criterion samples the spatial resolution 2X per cycle and averages incoming data to insure no info is missed, overlapped or doubled.
Aliasing incoming data is samples less than 2X per cycle, images have more pattern
What factors affect recorded detail? FSS, OID, SID, IR, CR imaging plates, size of detector, image processing system, motion
Increasing the SID affects recorded detail how? increases
Decreasing OID affects recorded detail how? increases
Increasing patient thickness affects recorded detail how? decreases
Decreasing FSS affects recorded detail how? increases
Created by: annaluz87
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