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QM Registry Ch. 12

Quality Control in Computed Tomography

QuestionAnswer
acceptance testing QC testing performed on new equipment on delivery and installation
contrast scale change in linear attenuation coefficient per computed tomographic number relative to water
high-contrast spatial resolution minimum distance between two objects that allows them to be seen as separate and distinct
linearity sequential increases in mAs should produce same sequential increase in exposure rate
mean CT number average pixel value calculated by dividing total CT value by total number of pixels in a sample
noise random signals or disturbances that interfere with proper image formation or demonstration
phantoms QC test tool used to simulate human tissue or body parts or demonstrate certain image characteristics
region of interest specified region of image that is selected for display or analysis
standard deviations amount of variance in a sample
Created by: sspatel