Beam hardening artifact correction device and method for ct images

Abstract

The present invention provides a beam hardening artifact correction device and method for CT images. The device includes a bone tissue image acquisition module, a first correction module, an orthographic projection module and a corrected image acquisition module. The bone tissue image acquisition module is used to extract the bone tissue image from the reconstructed original image; the first correction module is used to adjust the current CT value of the bone tissue image; the forward projection module is used to adjust the bone tissue image after the CT value The front projection is performed to obtain the front projection data of the bone tissue image; the corrected image acquisition module is used for performing image reconstruction according to the front projection data of the bone tissue image and to obtain the corrected image.

Description

technical field [0001] The invention relates to the field of X-ray detection, in particular to a beam hardening artifact correction device and method for CT images. Background technique [0002] Since X-rays are polychromatic rays, in computed tomography (CT) medical imaging technology, higher-energy X-rays have less attenuation than lower-energy X-rays, and as the thickness of X-ray projection increases , making more high-energy X-rays, resulting in beam hardening, so there are beam hardening artifacts in the reconstructed image. [0003] At present, some correction methods can be used to reduce beam hardening artifacts, but the effect on beam hardening artifacts caused by bone tissue is not ideal. [0004] For example, in the prior art, the original image is obtained by reconstruction according to the original projection data, the bone tissue image is extracted from the reconstructed original image, the extracted bone tissue image is projected, and the beam is corrected b...

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Problems solved by technology

[0005] However, due to beam hardening, the obtained original projection data itself is inaccurate, so the bone tissue image extracted in the original image and the projection data of the bone tissue image are both inaccurate, so it is difficult to obtain more accurate correction data

[0006] Figure 12 a and Figure 12 b are images obtained after performing beam hardening correction on human brain images in the prior art, such as Figure 12 a and Figure 12 As shown in b, after using the existing correction method to correct the image, the beam hardening artifacts are less, but the connection between the bone tissue and soft tissue around the brain is still blurred

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