For example, only a few slices may be necessary to diagnose a fracture of the distal radius but more slices are needed to demonstrate alignment of the articular surface with respect to surrounding structures. Adequate landmarks must be provided if treatment decisions are to be made from CT images. For example, a slice width of 1 mm, a pitch of 1, and a 100 second spiral yields a 100 mm coverage.
Most musculoskeletal applications require greater coverage.