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A cone beam CT beam hardening curve detection and projection weighting correction method

A beam hardening and correction method technology, applied in image enhancement, instrumentation, calculation, etc., can solve problems such as limitations and poor generality of existing methods, and achieve the effect of reducing interference and influence, improving image quality, and good noise resistance

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

[0005] Although the above different methods have achieved a certain effect of suppressing beam hardening artifacts, the existing methods have poor versatility for the requirements of cone beam CT medical imaging and industrial non-destructive testing, and are often subject to many limitations in practical applications.

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  • A cone beam CT beam hardening curve detection and projection weighting correction method
  • A cone beam CT beam hardening curve detection and projection weighting correction method
  • A cone beam CT beam hardening curve detection and projection weighting correction method

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Embodiment Construction

[0035] 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 1621 AN15 ES, and it is equipped with scanning mechanism, system control and computing computer), the two parts Carry out projection sampling, apply the method of the present invention to the cone beam CT beam hardening curve detection and projection weighted correction method, perform the following steps:

[0036] (1) Through the multi-energy spectral ray source industrial cone beam CT equipment, the ray source voltage is 420kV and the current is 0.75mA. The scanning geometric parameters are: the distance from the ray source to the detector is 1241.832886mm, and the distance from the ray source to the center of rotation is 965.323242mm; the reconstruction resolution The rate is 512×512, and the circular scan obtains 360 cone-beam CT projections of the detection object. According to the projection sampling geometric parameters, th...

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Abstract

The invention discloses a cone beam CT (computed tomography) beam hardening curve detection and projection weighting correction method, which comprises the following steps of: solving an intersectionline length by using ray sampling matrix information priori knowledge and a pre-reconstructed slice image and by using rays and a binary image, and performingdetecting to obtain a beam hardening curve; By performing projection weighting correction on the fitting function, hardening correction of multi-energy projection is realized, cup-shaped artifacts caused by multi-energy projection reconstruction can be prevented, and the image quality is improved. The cone beam CT beam hardening curve detection and projection weighting correction method is suitable for hardening curve detection and cup-shaped artifact correction of a measured object with any complexity, the method is good in reliability, stability and noise resistance, interference and influence of cone beam CT hardening projection cup-shaped artifacts on an image can be reduced to a great extent, and the quality of the cone beam CT image is obviously improved.

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 cone-beam CT beam hardening curve detection and projection weighted correction method. 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. [0003] The rays used in actual industrial ray detection are not monochromatic rays, but wide-beam, continuous-spectrum polychromatic rays. Moreover, industrial CT scans have relatively high energy. Due to the different degrees of attenuation of different energy ra...

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Application Information

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IPC IPC(8): G06T5/00
Inventor 杨富强张定华张华黄魁东
Owner NORTHWESTERN POLYTECHNICAL UNIV
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