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QM Registry Ch. 12
Quality Control in Computed Tomography
Question | Answer |
---|---|
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 |