A cone-beam CT image reconstruction method based on asymmetric scattering correction plate is presented

A scatter correction, CT image technology, applied in the field of cone beam CT image reconstruction, can solve the problems of truncation artifacts, affecting the quality of reconstructed images, loss of primary signals, etc., to reduce radiation dose, improve reconstructed image quality, and reduce scanning times. Effect

Active Publication Date: 2019-02-15
PLA STRATEGIC SUPPORT FORCE INFORMATION ENG UNIV PLA SSF IEU
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Problems solved by technology

However, due to the primary signal loss caused by lead occlusion, direct use of the FDK algorithm for 3D reconstruction often results in truncation artifacts, which seriously affect the quality of the reconstructed image

Method used

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  • A cone-beam CT image reconstruction method based on asymmetric scattering correction plate is presented
  • A cone-beam CT image reconstruction method based on asymmetric scattering correction plate is presented
  • A cone-beam CT image reconstruction method based on asymmetric scattering correction plate is presented

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Embodiment 1

[0057] Such as figure 1 As shown, a cone beam CT image reconstruction method based on an asymmetric scatter correction plate of this embodiment includes the following steps:

[0058] Step S101: Place the asymmetric scatter correction plate between the object and the detector, and use the cone beam CT system to collect projection data in a single circular scan.

[0059] Step S102: Perform scatter correction on the projection data collected in Step 1. The specific implementation process is as follows:

[0060] Step S1021, extract the effective measurement value

[0061] In order to reduce the measurement error, take the data within the width w / 3 of the center of the lead bar occlusion area in the projection as the effective measurement value, and take the longitudinal average of the effective area of ​​each lead bar as the measurement value at each longitudinal center position of the lead bar;

[0062] Step S1022, smooth noise reduction

[0063] Perform average filtering on the extracted ...

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Abstract

The invention belongs to the technical field of cone-beam CT image reconstruction, in particular to a cone-beam CT image reconstruction method based on an asymmetric scattering correction plate. The method firstly nulls the correction plate occlusion area data after scattering correction based on the cone-beam CT projection data collected by the asymmetric scattering correction plate. Then the local filter operator is used to replace the original global filter operator for weighted filtering, which effectively avoids the influence of truncation artifacts. Finally, the quality of the reconstructed image is improved by using the redundancy and consistency of the projection data, and the CT image with good quality can be reconstructed only by using the projection data of a single circumferential scan, which effectively reduces the scanning times, greatly improves the scanning efficiency and reduces the radiation dose.

Description

Technical field [0001] The invention belongs to the technical field of cone beam CT image reconstruction, and particularly relates to a cone beam CT image reconstruction method based on an asymmetric scatter correction plate. Background technique [0002] In cone-beam CT imaging systems, due to the influence of factors such as ray cone angle, irradiation field of view, signal crosstalk, etc., the incident rays received by the flat panel detector often contain more scattered rays, which makes the CT value of the reconstructed image deviate from the ideal truth. Value, forming cup-shaped, strip-shaped or band-shaped artifacts and shadows, greatly reducing the image contrast and seriously affecting the quality of the reconstructed image. Therefore, it is usually necessary to perform scatter artifact correction on the acquired CT data before three-dimensional reconstruction to improve the quality of the reconstructed image and improve the recognition of the reconstructed image. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00
CPCG06T11/005G06T11/006G06T2211/421
Inventor 闫镔刘建邦李磊席晓琦韩玉朱林林孙艳敏董鹏朱明婉
Owner PLA STRATEGIC SUPPORT FORCE INFORMATION ENG UNIV PLA SSF IEU
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