Factors affecting the appearance  
 

CT images are produced with ionizing radiation, similar to radiographs. Therefore, some of the factors affecting the appearance of the CT images are similar to radiography (for example density).

Shape and thickness do not affect the final CT image as they do in radiographs, since CT images are not summations of superimposed structures.  With CT, the density of a structure, the display of the image, and the use of contrast enhancement agents are the main factors affecting the appearance.