Image reconstruction including shift-variant blur compensation

摘要

An image reconstruction method comprises reconstructing an image using an iterative reconstruction method and computing a projection used in the reconstructing by summing ray increments between neighboring planes (P0, P1, P2, . . . ) parallel with a detector face (42) with stationary incremental blurring associated with each ray increment computed based on a distance between the neighboring parallel planes. A non-stationary blurring kernel may also be convolved at a plane closest to the detector face to generate a projection incorporating shift-variant blurring.

主权项

1. An apparatus comprising:
a ray tracing module comprising a digital processor configured to perform a projection operation for a detector having shift-variant blurring by (i) computing ray increments between planes parallel with a detector face of the detector, (ii) computing stationary incremental blurring kernels corresponding to the ray increments, (iii) incrementally summing the ray increments convolved with the corresponding stationary incremental blurring kernels to generate a projection, and (iv) adjusting the projection for shift-variant blurring by convolving with a nonstationary blurring kernel at a plane proximate to the detector face to generate the projection incorporating shift-variant blurring; and an iterative image reconstruction module comprising a digital processor configured to generate a reconstructed image from projection data using iterative reconstruction including projection operations performed by the ray tracing module.