What Is Pitch Factor in Ct

In helical CT the pitch factor is the ratio of the couch increment per rotation to the nominal slice thickness at the axis of rotation. In clinical practice the inter- slice distance generally lies in the range between 0 and 10mm, and the pitch factor between 1 and 2.

How is CT pitch calculated?

Multidetector row CT. For MDCT, multiple slices are reconstructed per projection by the multiple rows of detectors. In MDCT, pitch is calculated by dividing the table movement by the entire beam width.

How does pitch affect CT image quality?

Pitch changes will affect the spatial resolution of the patient’s image and dose received. A large pitch will reduce resolution because the gap between slices is also wider, which affects the data interpolation process for image reconstruction.