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Multi-energy ct-based material decomposition method

A base material, multi-energy technology, applied in the field of radiation imaging, to achieve the effect of eliminating artifacts and improving artifacts

Active Publication Date: 2021-03-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is currently no effective method for directly removing artifacts in multi-energy CT

Method used

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  • Multi-energy ct-based material decomposition method
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  • Multi-energy ct-based material decomposition method

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no. 1 example

[0038] In a first exemplary embodiment of the present disclosure, a multi-energy CT-based material substance decomposition method is provided.

[0039] figure 2 It is a schematic diagram of a method for decomposing a multi-energy CT-based material according to an embodiment of the present disclosure. image 3 It is a flowchart of a method for decomposing a multi-energy CT-based material according to an embodiment of the present disclosure.

[0040] refer to figure 2 with image 3 As shown, the multi-energy CT-based material decomposition method of the present disclosure includes:

[0041] Step S101: Pre-establish the mapping relationship between the projection values ​​of M types of base materials with different thicknesses and N types of energies corresponding to different scattering intensities and the corresponding base material thicknesses and scattering intensities, M and N are both positive integers, N≥3 , 2≤M≤N-1, or M=N=2;

[0042] According to the CT projection...

no. 2 example

[0073] In the second exemplary embodiment of the present disclosure, a multi-energy CT-based material substance decomposition method is proposed.

[0074] In the introduction process of the above embodiment, the situation corresponding to N≥3, 2≤M≤N-1 is explained, and the multi-energy CT-based material decomposition method of the present disclosure can also correspond to the situation of M=N=2, that is, by establishing The two-way mapping relationship between the projection values ​​of the two base materials under the two energy spectra and the scattering intensity distribution is used to obtain an image without artifacts.

[0075] Step S101' in this embodiment is different from the process of establishing a mapping relationship in step S101 in the first embodiment. Subsequent steps are the same as the decomposition method of three energies and more than three energy-based materials, and finally a pseudo monoenergetic reconstructed image with scattering artifacts removed can ...

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Abstract

A multi-energy CT-based material material decomposition method, comprising: placing a scanned object in a multi-energy CT imaging system to obtain projection value data under N types of energies; The projection value data under the energy is mapped to obtain the projection data of M types of base materials; wherein, the mapping relationship is the projection value data of M types of base materials with different thicknesses and N types of energies corresponding to different scattering intensities and the corresponding thicknesses of M types of base materials and The mapping relationship between the scattering intensities, M and N are both positive integers, N≥3 and 2≤M≤N-1, or M=N=2; and image reconstruction based on the projection data of M kinds of base materials, to obtain different Image with artifacts. This method decomposes the measured projection value data into M kinds of base materials, and finds the projection data and scattering intensity of M base materials corresponding to the unknown object structure. Since the scattering intensity and the projection data of the base material are separated, it also realizes Good scatter artifact removal.

Description

technical field [0001] The disclosure belongs to the technical field of radiation imaging, and relates to a multi-energy CT-based material decomposition method. Background technique [0002] Computed tomography (CT, Computerized Tomography) uses X-ray beams and detectors to scan a certain section (section) of an object, and uses the different absorption coefficients of human organs or tissues to X-rays to obtain images that reflect the physical or chemical properties of this section. The projection data set is used to obtain the parameter value of any position on the section through computer operation, and thus obtain the tomographic image. [0003] The main components of a CT system include: an X-ray source, a detector, and a rotating device. In the process of CT imaging, the X-ray source and the detector rotate relative to the object to obtain CT data at different rotation angles, also known as CT projection values. In CT imaging, the attenuation of X-rays obeys the expon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T7/00G06T7/70
CPCG06T7/70G06T7/97G06T2207/10081G06T5/70
Inventor 高河伟邢宇翔吴承鹏张丽陈志强刘以农王森
Owner TSINGHUA UNIV