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Limited angle CT reconstruction method based on heavy weight anisotropic total variation

An anisotropic, limited-angle technology, applied in the field of limited-angle CT reconstruction based on reweighted anisotropic total variation, which can solve problems such as over-smoothing and partial boundary blurring, and achieve good reconstruction effects.

Active Publication Date: 2017-06-13
ZHEJIANG UNIV
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Problems solved by technology

[0007] In view of the above, the present invention provides a limited-angle CT reconstruction method based on reweighted anisotropic total variation, which solves the problems of over-smoothness and partial boundary blur in existing CT reconstruction algorithms, and can improve CT image reconstruction. the quality of

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  • Limited angle CT reconstruction method based on heavy weight anisotropic total variation
  • Limited angle CT reconstruction method based on heavy weight anisotropic total variation
  • Limited angle CT reconstruction method based on heavy weight anisotropic total variation

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Embodiment 1

[0063] In this embodiment, parallel light beams are used to irradiate CT images, the total number of projections is 256×80, and the total number of iterations is set to N iter is 10000, the number of iterations to solve the minimization term is N TV is 20, the weight coefficient a of the minimization item solution is 0.15, and the parameter ε is 10 -8 , the parameter ξ is 10 -8 , the iteration termination threshold δ is 10 -4 .

[0064] The practicability and reliability of this embodiment is verified by reconstructing the sinogram of the Shepp&Logan phantom model. The ground-truth image of the Shepp&Logan phantom model is as follows figure 2 As shown, the corresponding gray value map is shown in image 3 As shown, the sine diagram (full angle of 180°) is as Figure 4 shown. Adopt method of the present invention (ART+RwATV, the selection of parameter is: A=1, B=0.001) and anisotropic total variation method (ART+ATV, the selection of parameter is: A=1, B=0.001) to proje...

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Abstract

The invention discloses a limited angle CT reconstruction method based on heavy weight anisotropic total variation. The method includes the steps that based on a CT imaging principle, a CT image reconstruction equation is established; all parameters are initialized; a data fidelity item and a heavy weight anisotropic total variation minimized item are solved iteratively until iteration stopping conditions are met. Through the method that the anisotropic conception is fused into heavy weight, the reconstruction restoration effect of a limited angle CT reconstruction algorithm is effectively improved, and a real CT image is better restored. Compared with experiments of an existing reconstruction method, it shows that the method not only can achieve the better reconstruction effect, but also consumes shorter time for reconstruction.

Description

technical field [0001] The invention belongs to the technical field of CT imaging, and in particular relates to a limited-angle CT reconstruction method based on reweighted anisotropic total variation. Background technique [0002] X-ray CT has important applications in many application fields, such as the field of medical imaging for diagnosis and treatment, the field of safety inspection, and the field of product quality inspection and control. Besides accurate and robust image reconstruction, the limited angle problem has also received extensive attention. On the one hand, for the sake of the patient's health, it is hoped that the X-ray exposure to the patient can be reduced as much as possible. On the other hand, it is difficult for the patient to remain still for a long time to cooperate with the X-ray exposure, so it is hoped that the scanning time can be shortened as much as possible. These can be achieved by reducing the X-ray dose on the one hand, and by reducing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00
CPCG06T11/005
Inventor 刘华锋王婷
Owner ZHEJIANG UNIV
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