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.
CN108010098AActive Publication Date: 2018-05-08CAPITAL NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
CAPITAL NORMAL UNIVERSITY
Publication Date
2018-05-08

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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.
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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...

Claims

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