Blocking optical grating optimization method and device for scattering correction of cone-beam CT (computed tomography) image

Abstract

The present invention provides a blocking optical grating optimization method and device for the scattering correction of a cone-beam CT (computed tomography) image. The method includes the following steps that: a blocking optical grating is scanned, and the swing model of the blocking optical grating is established; the initial coordinates of the blocking optical grating in the longitudinal direction of a detector in an initial projection are set, and an objective function between the data missing voxel value of the CBCT image and the coordinates of the blocking optical grating in the longitudinal direction of the detector is established; and the objective function is minimized by using a mesh adaptive direct search algorithm, so that the optimized coordinates of the blocking optical grating in the longitudinal direction of the detector can be generated. According to the brand new scattering correction method which does not require source compensation and is suitable for clinical CBCT in the present invention, mathematical optimization modeling is performed for data loss in an image field caused by the blocking optical grating; influence on a reconstructed image caused by the blocking device is quantitatively evaluated; the geometric optimal structure of the blocking device is solved by means of the mesh adaptive direct search method; and a solid theoretical basis is established for blocking device measurement-based scattering correction methods.

Description

technical field [0001] The invention relates to the field of medical imaging related to the application of cone-beam CT, in particular to a blocking grating optimization method and device for correction of cone-beam CT image scattering. Background technique [0002] This section is intended to provide a background or context for implementations of the invention that are recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] Image guide radiation therapy (IGRT) is currently the most important means of precision radiotherapy. IGRT can provide precise location information for precise lesion localization and tumor irradiation, and has been widely used in contemporary minimally invasive surgery and radiation therapy. X-ray CBCT installed at the treatment bedside is an important means of realization of contemporary image guidance. [0004] However, with the expansion of the irradiation volume in a single projection...

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Problems solved by technology

[0010] The purpose of the present invention is to provide a blocking grating optimization method and device for scatter correction of cone-beam CT images, so as to solve the existing problems of increasing the number of scans and difficult accurate extraction of scatter signals when using a blocker for scatter correction

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