Method and device for formation, scattering component calculation and reconstruction of X-ray images

Abstract

The invention discloses a method and device for image formation, scattering component calculation and reconstruction of X-ray images. The method for image formation of the X-ray image comprises the following steps: collecting X-rays passing through a collimator and an imaging object in sequence to form an X-ray image group, wherein the collection is performed when the collimator moves along a first direction, and the X-ray image group is a group of X-ray images collected at different moments of the movement of the collimator; extracting sub-region images of each X-ray image in the X-ray image group; and combining the sub-region images along the first direction to form modulated X-ray images. In implementation of the technical scheme of the invention, the collimator is used for performing flexible modulation on X-ray intensity distribution, extra hardware is not increased, scattering components in the X-ray images are calculated, and finally the scattering quantity of the X-ray images is reduced.

Description

technical field [0001] The invention relates to the field of medical images, in particular to a method and device for forming, calculating and reconstructing X-ray images. Background technique [0002] In X-ray images, scattered rays have always been an important factor leading to unsatisfactory image quality. Especially for X-ray systems with a larger detector area, such as radiotherapy equipment, cone beam computed tomography (Cone Beam Computed Tomography) uses an Electronic Portal Imaging Device (EPID, Electronic Portal Imaging Device) as a detector for receiving X-rays , the scattered rays account for a large proportion of the X-rays it receives. Scattered rays cause cupping artifacts on the image, reduce the contrast of the image, and greatly reduce the image accuracy of the reconstructed image. During radiation therapy, cone-beam CT is used to obtain images of patients in real time and image-guid radiation therapy. The reduction of image accuracy leads to position e...

AI Technical Summary

Problems solved by technology

In the process of radiotherapy, cone beam CT is used to obtain images of patients in real time and conduct image guidance for radiotherapy. The reduction of image accuracy leads to position errors of radiotherapy, which cannot achieve the goal of precise radiotherapy for tumor regions.

Images