Sparse Angular CT Image Reconstruction Method Based on Gamma Prior

A sparse angle, CT image technology, applied in image data processing, 2D image generation, instruments, etc., to achieve the effect of suppressing streak artifacts, good application and promotion

Active Publication Date: 2017-06-23
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The sparse angle reconstruction based on the TV criterion will still have obvious strip artifacts after the angle is reduced to a certain extent

Method used

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  • Sparse Angular CT Image Reconstruction Method Based on Gamma Prior
  • Sparse Angular CT Image Reconstruction Method Based on Gamma Prior
  • Sparse Angular CT Image Reconstruction Method Based on Gamma Prior

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Embodiment Construction

[0027] Below in conjunction with specific embodiment, further illustrate the present invention, should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various equivalent forms of the present invention All modifications fall within the scope defined by the appended claims of the present application.

[0028] Define f to represent the image to be reconstructed, and the model of the TV method is as follows:

[0029]

[0030] The sparse angle CT reconstruction method based on gamma prior of the present invention improves the TV method, and establishes an iterative model based on gamma prior, which reconstructs the sparse angle projection data as close as possible to the corresponding full The image reconstructed from the angle projection data is used as the target, and the gamma sparse item is ...

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Abstract

The invention discloses a sparse angle CT image reconstruction method based on gamma prior, which can be directly applied to the medical CT projection data, and solves the problems that the sparse angle CT imaging is susceptible to the affection of striped artifact, and the quality of the CT image is remarkably reduced. The method comprises the following steps: carrying out the sparse-angle sampling for an object according to a uniform angle, and acquiring the sparse projection data; carrying out the iterative reconstruction for the acquired projection data by utilizing a gamma prior model; and finally displaying the reconstructed CT image according to an appropriate window width and a window level. The experiment result of clinical data proves that the striped artifact in the CT image under the sparse angle can be effectively inhibited, so that the quality of the CT image under the sparse angle is approximate to the clinical quality level of the normal-angle CT image, and the method can be well applied and popularized in the existing CT device.

Description

technical field [0001] The invention relates to a sparse-angle CT image reconstruction method based on gamma prior, and belongs to the problem of sparse-angle CT imaging in the technical field of computerized tomography. Background technique [0002] As a conventional and effective clinical medical diagnostic tool, X-ray computerized tomography (X-ray Computerized Tomography, CT) can clearly obtain the attenuation information of different tissues of the human body for X-rays on the millimeter scale, so as to provide clinicians with diagnostic and Prevention provides rich 3D human organ tissue information. Today, as a mature and clinically recognized inspection method, CT has become one of the indispensable and main tools in the field of radiological diagnosis. However, with the popularity of CT tomography in clinical diagnosis, especially in routine examinations, the radiation dose in CT scanning has attracted more and more attention. A large number of clinical studies have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T11/00
Inventor 陈阳张俊峰罗立民
Owner SOUTHEAST UNIV
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