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An image reconstruction method and system based on katsevich algorithm

An image reconstruction and algorithm technology, which is applied in the image processing field of medical imaging, can solve the problems of insufficient improvement and loss of image reconstruction effects, and achieve the effects of reducing influence, reducing error artifacts, and simple operation

Inactive Publication Date: 2016-10-05
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

Using a single method for derivation will easily lead to the loss of the result of derivation, resulting in new errors, so that the improvement of the image reconstruction effect is not obvious enough

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  • An image reconstruction method and system based on katsevich algorithm
  • An image reconstruction method and system based on katsevich algorithm
  • An image reconstruction method and system based on katsevich algorithm

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] as attached figure 1 The shown image reconstruction method based on the Katsevich algorithm comprises the following steps in turn:

[0035] (1) Acquire the CT machine system parameters and the projection data needed to reconstruct the image. When the acquired projection data contains noise, the obtained projection data needs to be filtered to reduce the influence of noise on artifacts in the reconstructed image in subsequent operations.

[0036] (2) The projection data obtained in step (1) is derived based on the mixed derivation of the three-point method and the Richardson extrapolation method. The specific implementation method is as follows: image 3 As shown, the derivation of at least two projection data (edge ​​data) from the beginning to the end of each row, column, and frame of the projection data is derived using the three-poi...

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Abstract

The invention provides an image reconstruction method based on the Katsevich algorithm. By optimizing errors of all operation modules in the Katsevich reconstruction algorithm, influence of error artifacts on a reconstructed image can be effectively reduced and true information of an original CT image can be kept. As is shown in repeated simulation practice, the method is easy to implement and can effectively reduce error artifacts in the CT image; influence of metal artifacts on the reconstructed image obtained through the method can be reduced, and detail information of regions which a user is interested in can be kept as well.

Description

technical field [0001] The invention belongs to the field of image processing of medical images, in particular to a method and system for image reconstruction based on Katsevich algorithm. Background technique [0002] In the reconstructed image of the exact reconstruction algorithm katsevich, artifacts of various shapes appear, which affect the accuracy of the algorithm's imaging. Among them, the artifacts produced by the discretization of the projection data in the reconstruction process are the most important source of artifacts. The direct cause of the correction artifact is that the Katsevich algorithm itself is an accurate reconstruction algorithm, but the projection data that is indispensable in practical applications is discrete, and the subsequent operations are the corresponding approximate operations on the discrete data. As a result, the final image contains a large number of artifacts. In order to obtain high-quality CT reconstruction images, it is necessary t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T11/00
Inventor 张岩纪东梅高伦景丽
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL