Beam hardening artifact correcting device and method for CT image
A beam hardening, CT image technology, applied in the field of X-ray detection, can solve the problems of inaccurate projection data of bone tissue images, blurred connection between bone tissue and soft tissue around the brain, and difficult data correction.
Active Publication Date: 2017-04-05
GENERAL ELECTRIC CO
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[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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[0019] Specific implementations of the present invention will be described below. It should be noted that in the process of specific descriptions of these implementations, for the sake of concise description, it is impossible for this specification to describe all the features of the actual implementations in detail. It should be understood that, in the actual implementation process of any embodiment, just like in the process of any engineering project or design project, in order to achieve the developer's specific goals and to meet system-related or business-related constraints, Often a variety of specific decisions are made, and this can vary from one implementation to another. In addition, it will be appreciated that while such development efforts may be complex and lengthy, the technology disclosed in this disclosure will be Some design, manufacturing or production changes based on the content are just conventional technical means, and should not be interpreted as insuffic...
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The invention provides a beam hardening artifact correcting device and method for a CT image. The device comprises a bone tissue image acquisition module, a first correcting module, an orthographic projection module and a corrected image acquisition module. The bone tissue image acquisition module is used for extracting a bone tissue image from a reconstructed original image; the first correcting module is used for adjusting a current CT value of the bone tissue image; the orthographic projection module is used for performing orthographic projection on the bone tissue image with the CT value adjusted to acquire orthographic projection data of the bone tissue image; and the corrected image acquisition module is used for performing image reconstruction according to the orthographic projection data of the bone tissue image and acquiring a 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. With the increase of X-ray projection thickness , 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 base...
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IPC IPC(8): A61B6/03G06T5/00
CPCG06T11/003G06T5/77G06T7/0012G06T2207/10081G06T2207/30008
Inventor 曹蹊渺王学礼谢强
Owner GENERAL ELECTRIC CO