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CT Quality

Across
Artifacts that have metal objects in the SFOV
Object seen on the image that is not present in the object scanned
Image quality is not directly linked to the dose, so even when an mA and kVp setting that is too high is used
Ability to resolve small, high- contrast objects
Undersampling causes inaccuracies related to reproducing sharp edges and small objects
X-ray beam passes through an object, lower- energy photons are preferentially absorbed
How rapidly data are acquired
Happens when there is a large difference in electrical potential
How well the image represents the object scanned
Artifacts caused by anatomy that extends outside of the selected SFOV
Images are not all in same plane
Quality of x-ray beam
Down
MA and scan time; quantity of x-ray energy
Appear as shading, ghosting, streaking or blurring
Degrades its quality, particularly its contrast resolution
Ability to differentiate between objects with very similar densities
Caused by imperfect detector elements
More than one type of tissue is contained within a voxel
Streak artifact or shading arising from irregularly shaped objects that have a pronounced difference in density from surrounding structures
Number of line pairs visible per unit length
Critical in avoiding image degradation as a result of patient motion
Relationship between slice thickness and table travel per rotation during a helical scan
Area, within gantry, for which raw data are acquired