CT system and CT image reconstruction method

A CT image and image technology, applied in the field of CT system and CT image reconstruction, can solve the problems of low speed of CT image reconstruction, long CT scanning time, large X-ray radiation dose, etc.

Inactive Publication Date: 2016-05-25
肖古华
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[0004] The object of the present invention is to provide a CT system and a CT image reconstruction method, aiming to solve the pro

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  • CT system and CT image reconstruction method

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[0044] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0045] The application principle of the present invention will be further described below with reference to the drawings and specific embodiments.

[0046] Such as figure 1 : A CT image reconstruction method, the method includes:

[0047] S101. Fix the radiation source and the radiation detector;

[0048] S102. Obtain projection data of the CT scan.

[0049] S103: Perform iterative processing according to the projection data to obtain a target image;

[0050] S104. Perform non-negative processing on the target image to obtain a non-negative image of the target image.

[0051] S105. Perform nonlinear decomposition on the non-ne...

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Abstract

The invention discloses a CT system and a CT image reconstruction method. A ray detector detects ray of a ray source, converts the ray into a signal and transmits the signal to a data acquisition module; the data acquisition module transmits the received signal to a processor module; and the data acquisition module obtains projection data acquired by CT scanning. The method comprises the steps of performing non negative processing on a target image to obtain a non negative image of the target image; then performing nonlinear decomposition on the non negative image to obtain a first non negative image and a second non negative image; and finally performing sparsification processing on the first non negative image and the second non negative image to obtain an optimal sparse solution, and realizing CT image reconstruction according to the optimal sparse solution. Therefore, the number of dimensions of an image matrix in a calculation process is reduced and the image reconstruction efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of X-ray computed tomography, and in particular relates to a CT system and a CT image reconstruction method. Background technique [0002] Computed tomography (CT) is an important imaging method to obtain the internal structure information of objects in a non-destructive way. It has many advantages such as high resolution, high sensitivity and multi-level, and is one of the medical imaging diagnostic equipment with the largest installed capacity in my country. It is widely used in various medical clinical examination fields. However, since X-rays are needed in the CT scanning process, the radiation dose of X-rays in CT scanning has drawn more and more attention. The principle of reasonable use of low dose (AsLowAsReasonablyAchievable, ALARA) requires that the radiation dose to patients should be reduced as much as possible on the premise of satisfying the clinical diagnosis. [0003] The realization of trad...

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Application Information

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IPC IPC(8): G06T11/00
CPCG06T11/005G06T11/006
Inventor 肖古华
Owner 肖古华
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