SPIRAL CT PITCH EFFECT

PITCH EFFECT:

CT pitch is generally defined as the table travel per rotation divided by the collimation of the x-ray beam. This beam-pitch definition can also be refered to as table travel per rotation divided by effective detector row thickness. Thus, a beam-pitch of 1.0 facilitates an acquisition with no overlap or gap, a beam-pitch of less than 1.0 facilitates an overlapping acquisition, and a beam-pitch of greater than 1.0 facilitates an interspersed acquisition. Pitch has a smaller effect on image quality with use of multi–detector row CT scanners than it does with use of single–detector row CT scanners.