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Method for iteratively reconstructing double-energy spectrum CT base material images

An iterative reconstruction and base material technology, which is applied in the field of iterative reconstruction of dual-energy spectrum CT base material images, can solve problems such as decomposition noise amplification, and achieve the effects of reducing reconstruction noise, strong applicability, and reduced computational complexity.

Active Publication Date: 2018-05-08
CAPITAL NORMAL UNIVERSITY
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Problems solved by technology

[0004] The present invention provides an iterative reconstruction method of a dual-energy spectrum CT base material density image, which is used to solve the problem of amplified decomposition noise in the base material image in the prior art, so as to improve the reconstruction quality of the base material image

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  • Method for iteratively reconstructing double-energy spectrum CT base material images
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  • Method for iteratively reconstructing double-energy spectrum CT base material images

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[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0055] Conventional X-ray sources emit polychromatic X-rays that obey a certain spectral distribution, rather than single-energy X-rays. Therefore, what the dual-energy spectrum CT scans the object to be measured is not the ideal high- and low-energy monochromatic projections, but high-energy X-rays. , polychromatic projection of the low energy spectrum. In the case of ignoring the X-ray scattering effect, the matrix material decomposition problem of dual-ener...

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Abstract

The invention discloses a method for iteratively reconstructing double-energy spectrum CT base material images, and aims at reconstructing base material density images of tested objects. The method comprises the following steps of: scanning a tested object by using a double-energy spectrum CT system so as to obtain double-energy spectrum projection data of the tested object; respectively reconstructing a high / low-energy spectrum tested object images on the basis of high / low-energy spectrum projection data; calculating a linear combined image of the high / low-energy spectrum tested object images; solving a specific value image of a base material density image and the linear combined image, establishing a regularized constraint image reconstruction model by taking the condition of minimizinga total variation of the specific value image as a constraint condition, and iteratively reconstructing the base material density image of the tested object. According to the method, structure consistency among various double-energy CT reconstruction images is sufficiently utilized, so that the reconstruction noise amplified by base material decomposition is effectively reduced and the convergencespeed of iterative reconstruction of base material images is improved.

Description

technical field [0001] The invention relates to the technical field of X-ray computerized tomography (CT), in particular to a method for iterative reconstruction of a dual-energy spectrum CT-based material image. Background technique [0002] X-ray CT technology is a technology that uses the principle of interaction between X-rays and matter to image the internal information of objects. It is not only used in medical testing, but also widely used in non-destructive testing of key components in various industries. Traditional single-energy spectrum X-ray CT uses one X-ray energy spectrum to scan the measured object. The CT reconstruction images of different substances may have the same or similar CT values, making it difficult to distinguish different substances. Dual-energy spectrum CT uses two X-ray energy spectra to scan the measured object, and can obtain more information about the measured object than traditional single-energy spectrum CT. Using this information, the de...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00
CPCG06T11/006G06T2211/408G06T2211/424
Inventor 赵星
Owner CAPITAL NORMAL UNIVERSITY
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