Scattering correction method and device for computer tomography image

Abstract

The invention relates to a scattering correction method for a computer tomography image, a system, computer equipment and a storage medium. According to the method, a current standard projection imageis subjected to scattering correction by using the image data of a previous standard projection image and a latter standard projection image, after a CBCT system uniformly acquires multiple standardprojection images through one circle of scanning, each standard projection image is subjected to the scattering correction by using the image data of the previous standard projection image and the latter standard projection image, it is effectively avoided that scattering artifacts in a reconstructed CT image are formed, a target object is only needed to be scanned once, the radiation dose of thetarget object is not increased, and the radiation dose of the target object is minimized while the quality of the CBCT image is ensured.

Description

technical field [0001] The present application relates to the technical field of image processing, in particular to a method, device, computer equipment and storage medium for scatter correction of computed tomography images. Background technique [0002] Cone-beam Computed Tomography (CBCT) plays a very important role in the field of medical imaging. However, since the detector used in CBCT is a flat-panel detector, the collimator cannot be used to block the scattered rays, so the reconstruction There are serious scattering artifacts in CBCT images. CBCT scattering seriously restricts the in-depth application and development of CBCT images in clinic. [0003] Traditional hardware-based scatter correction methods usually add several hardware tools to the X-ray imaging system to reduce the scattered rays reaching the flat panel detector to achieve the purpose of scatter correction, or to calculate the amount of scattered rays from the total ray The amount of scattered rays ...

AI Technical Summary

Problems solved by technology

Hardware-based scattering methods mainly include anti-scatter grid, air gap and attenuation plate correction methods. However, anti-scatter grid and air gap methods often have the loss of the original signal, and often need to increase the patient's exposure dose to compensate for the attenuated The attenuation plate correction method requires a second scan of the patient, resulting in an increase in the patient's exposure dose; the hardware-based scattering correction method generally has the disadvantage of increasing the X-ray exposure dose, which is difficult to apply in clinical applications

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