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A cone beam CT ill-condition projection reconstruction artifact inhibition method

A projection and pathological technology, applied in the fields of medical imaging and industrial non-destructive testing, to achieve good noise resistance, improve image quality, and reduce interference and impact

Active Publication Date: 2019-06-21
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0006] Aiming at the problem of blurred edges and strip artifacts caused by pathological projection reconstruction when the local size of the object is thick and X-rays are not enough to penetrate effectively, the projection data is invalid or submerged by noise, etc., the present invention provides a cone beam CT pathological projection The reconstruction artifact suppression method utilizes the accuracy of the filtered back-projection algorithm and the advantages of iterative algorithms to suppress noise, and through the reconstruction image fusion and iterative update method of the analytical algorithm and the iterative algorithm, the pathological projection reconstruction artifact suppression is realized, and the image signal-to-noise is improved. Ratio, reducing artifact interference caused by ill-conditioned projection reconstruction

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  • A cone beam CT ill-condition projection reconstruction artifact inhibition method
  • A cone beam CT ill-condition projection reconstruction artifact inhibition method
  • A cone beam CT ill-condition projection reconstruction artifact inhibition method

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[0036] Through the existing industrial cone beam CT equipment (the X-ray source is Comet's MXR-451HP / 11, the flat panel detector is PerkinElmer's XRD 1621AN15ES, and has a scanning mechanism, system control and computer for calculation), the titanium-based alloy parts are processed Projection sampling, applying the method of the present invention suppresses the reconstructed artifacts of cone-beam CT pathological projections, and performs the following steps:

[0037] (1) Through the industrial cone beam CT equipment, the radiation source voltage is 450kV and the current is 0.72mA. The scanning geometric parameters are: the distance from the radiation source to the detector is 1229.403678mm, the distance from the radiation source to the center of rotation is 789.5341mm; the reconstruction resolution is 256×256 , 360 cone-beam CT projections of the object to be detected are obtained by circular scanning.

[0038] (2) Scatter correction and beam hardening correction are performe...

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Abstract

The invention discloses a cone beam CT ill-condition projection reconstruction artifact inhibition method. By utilizing the accuracy of a filtering back projection algorithm and the noise suppressionadvantage of an iterative algorithm, reconstruction image fusion of an analytical algorithm and an iterative algorithm and an iterative updating method, ill-conditioned projection reconstruction artifact suppression is realized, the signal-to-noise ratio of the image is improved, and artifact interference caused by ill-conditioned projection reconstruction is prevented. The cone beam CT ill-condition projection reconstruction artifact inhibition method is suitable for the projection reconstruction artifact inhibition under the conditions of normal projection and less ill-condition projection angles, is good in reliability, stability and noise resistance, can reduce the interference and influence of the cone beam CT ill-condition projection reconstruction artifact on the image to a great extent, and obviously improves the quality of the cone beam CT image.

Description

technical field [0001] The invention belongs to the fields of medical imaging and industrial non-destructive testing related to the application of cone-beam CT, and relates to a method for suppressing reconstruction artifacts of cone-beam CT pathological projections. Background technique [0002] Cone beam CT (Cone Beam Computed Tomography, CBCT), as an advanced medical imaging and industrial non-destructive testing technology, can clearly, accurately and intuitively display the detected object in the form of two-dimensional or three-dimensional tomographic images without destroying the object The internal structure of the object can quantitatively provide the position and size of the internal defect of the object. Cone beam CT has the advantages of fast scanning speed, high image resolution, and high radiation utilization. [0003] Cone-beam CT obtains the projection data of a series of angles of the measured object through the X-ray source and the area array detector, and...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00G06T7/11G06T5/50G06T5/00
Inventor 杨富强张定华张华黄魁东
Owner NORTHWESTERN POLYTECHNICAL UNIV
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