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