METHODS AND APPARATUS FOR SCATTER CORRECTION FOR CBCT SYSTEM AND CONE-BEAM IMAGE RECONSTRUCTION

摘要

Embodiments of methods and/or apparatus for 3-D volume image reconstruction of a subject, executed at least in part on a computer for use with a digital radiographic apparatus, can obtain image data for 2-D projection images over a range of scan angles. For each of the plurality of projection images, an enhanced projection image can be generated. In one embodiment, a first scatter intensity distribution through the plurality of projection images can be modulated based on a first scaling function and a SPR to generate a second scatter intensity distribution through the plurality of projection images, which can be combined with the original plurality of projection images.

主权项

1. A computer implemented method comprising:
capturing a plurality of 2D images of an object using an x-ray source emitting x-rays toward the object and a detector capturing image data of the object, the captured 2D x-ray images being captured over a range of different angles as between the x-ray source and the object; modifying each of the plurality of captured 2D x-ray images to correct artifacts in the images caused by scattering of the x-rays, the step of modifying each of the images including:
determining a scatter distribution of the x-rays in an air region near the object;determining a first scatter intensity of the x-rays within a shadow of the object based on the determined scatter distribution;determining a final scatter intensity of the x-rays within the shadow of the object, including modulating the first scatter intensity of the x-rays based on a modulator; andsubtracting the determined final scatter intensity of the x-rays from a corresponding captured 2D x-ray image to provide the modified 2D x-ray image.