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Low-dose X-ray CT projection data restoring method

A technology of projection data and restoration method, applied in the field of medical image processing, can solve the problems of large fluctuation and instability, and achieve the effect of high-quality reconstruction

Active Publication Date: 2014-05-21
SOUTHERN MEDICAL UNIVERSITY
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Problems solved by technology

The weighted square is not robust, that is, a small change in the data may cause relatively large fluctuations after the square

Method used

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  • Low-dose X-ray CT projection data restoring method
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Embodiment Construction

[0030] The invention provides a low-dose X-ray CT projection data recovery method based on penalty-weighted least-squares, which can perform data recovery processing on low-dose X-ray CT projection data with reduced tube current and scan time, effectively remove image noise and suppress stripes. shape artifacts while maintaining image detail information better.

[0031] combine figure 1 As shown, a preferred embodiment of the present invention includes the following implementation steps:

[0032] Step S1, obtaining the system parameters of the CT equipment and the projection data y of the low-dose X-ray CT image raw .

[0033] The system parameters of CT equipment mainly include X-ray incident photon intensity I 0 , the variance of the electronic noise of the system Wait;

[0034] Step S2, for the projection data y obtained in step S1 raw Statistical modeling is carried out on the noise characteristics of noise, and a data recovery model based on penalty weighted least ...

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Abstract

The invention discloses a low-dose X-ray CT projection data restoring method. The low-dose X-ray CT projection data restoring method includes acquiring projection data y<raw> of a low-dose X-ray CT image; setting up a data restoring model (shown in the description) based on penalized weighted least absolute for the projection data y raw, restoring the projection data y<raw> to obtain restored projection data y<restored>, wherein p is ideal projection data to be calculated, the parameter lambda is a non-negative real number, w is a weight factor (shown in the description), wherein both the parameters beta and epsilon are non-negative real numbers, and (shown in the description) is variance of the projection data y<raw>; reconstructing an image for the restored projection data y<restored> by means of an analyzing and reconstructing method to obtain the final low-dose X-ray CT image. The low-dose X-ray CT projection data restoring method is capable of restoring the low-dose CT projection data which is capable of reducing the tube current and scanning time and reconstructing the image through the analyzing and reconstructing method, the image noise is eliminated effectively, the streak artifact is inhibited, and the detail information of the image is well kept.

Description

technical field [0001] The invention relates to medical image processing technology, in particular to a low-dose X-ray CT projection data restoration method. Background technique [0002] X-ray CT scanning has been widely used in clinical medical imaging diagnosis, but excessive X-ray radiation dose during CT scanning may cause cancer risk. In order to reduce the damage to users, how to minimize the dose of X-rays has become one of the key technologies in the field of medical CT imaging. [0003] In order to reduce the X-ray radiation dose, the easiest way used in the prior art is to reduce the tube current and scanning time during the CT scanning process. On this basis, the prior art for low-dose X-ray CT image reconstruction mainly includes a filtered back-projection method and a statistical iterative reconstruction method. [0004] 1. Filtered Back-Projection (FBP). [0005] For low-dose X-ray CT images, the image reconstruction technology commonly used in clinical equ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00G06T5/00A61B6/03
Inventor 高杨边兆英黄静马建华
Owner SOUTHERN MEDICAL UNIVERSITY
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