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DS boards review

radiation factors

QuestionAnswer
exposure indicator is ___ proportional to exposure of the IR directly
S number is ___ proportional to exposure of the IR inversely
greater bit depth equals better contrast
what is PACS used for where all digital images are stored
what is the RIS order entry and patient information
what is the HIS patient demographic information, billing, supplies, order entry for testing
what is the EMR/EHR patient medical charts
contrast resolution ability of a digital imaging system to display changes in gray values
spatial resolution ability of a system to record adjacent small structures
what is spatial resolution measured in lp/mm
sampling frequency imaging plate as tis increases so does spatial resolution
DEL size/matrix size inversely related
fill afctor percentage of active area of a DEL available for signal acquisition
pitch distance from center of adjacent pixels
MTF describes the contribution of all system components
quantum noise/mottle loss of signal/missing signal
SNR/CNR ability to detect differential intensity to the ambient noise level
rescalling adjustment of pixel values to a preset range of values to produce consistent brightness and grayscale`
flat fielding evening out pixel values across entire image for consistent brightness
dead pixel correction kernel used to average out neighbor pixels and fill it in
grayscale varying pixel values across an image; number of brightness levels visible on an image
edge enhancement used to bring out small details; increases contrast
equalizaton dynamic range compression; removal of darkest and lightest pixel values from grayscale
smoothing suppresses visible motte
LUT stored histogram values of selected exams; used in rescaling
VOI recognized area within collimated field
masking used to shield viewer eyes from area outside of collimated field if the computer does not
stitching computer uses grid lines to crop and align multiple images into 1
Created by: rnmps
 

 



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