Method for reducing skew image artifacts in helical projection imaging

摘要

A method of reducing image artifacts in tomographic projection imaging systems where the projection data is acquired using continuous gantry motion and using a variable table velocity to transport the imaged object past the rotating gantry. The table velocity is decreased when the projections are being acquired near the slice plane and increased when the projections being acquired are further from the slice plane. The table position is coordinated with the acquisition of projections so that the middle projections of the tomographic projection set are acquired close to the slice plane and the beginning and end projections are acquired when the projections are taken furthest from the slice plane. Interpolation procedures are used to further reduce image artifacts resulting from the taking of projection data at points removed from the slice plane.