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Multi-energy-spectrum CT reconstruction method based on basic material decomposition and computer readable medium

A basic material and multi-spectral technology, applied in the field of multi-spectral CT reconstruction, can solve the problem of poor quality of reconstructed images, and achieve the effect of improving quality and reducing image artifacts

Active Publication Date: 2021-08-24
TONGJI UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Since the existing methods for reconstructing multi-energy spectrum CT images from energy spectrum filtering are essentially based on balanced filters, the number of energy spectrum image channels obtained is always less than the number of filter types used, resulting in poor quality reconstructed images

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  • Multi-energy-spectrum CT reconstruction method based on basic material decomposition and computer readable medium
  • Multi-energy-spectrum CT reconstruction method based on basic material decomposition and computer readable medium
  • Multi-energy-spectrum CT reconstruction method based on basic material decomposition and computer readable medium

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specific Embodiment approach

[0079] 1. BMD-SS-SXCT

[0080] Step 1: Obtain measurement data by SS-SXCT method

[0081] In SS-SXCT, two filters are given to modulate the energy spectrum of the X-ray source in two scans respectively, then the measured X-ray intensity attenuated by the object is:

[0082] I 1 =∫f 1 (E)I 0 (E)D(E)exp[-Hx(E)]dE,

[0083] I 2 =∫f 2 (E)I 0 (E)D(E)exp[-Hx(E)]dE,

[0084] Among them, f 1 (E) and f 2 (E) are the energy spectral transmittance of two filters respectively; I 0 (E) is the energy spectrum intensity of the ray source; D(E) is the responsivity of the detector, H is the system matrix of CT, which represents the integral transformation process of the ray passing through; exp[-Hx(E)] is the object x( E) Exponential decay.

[0085] Step 2: first obtain the coefficient image of the basic material components reconstructed based on the basic material decomposition BMD, and then obtain the mass attenuation coefficient of the basic material;

[0086] Such as figure ...

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Abstract

The invention relates to a multi-energy-spectrum CT reconstruction method based on basic material decomposition and a computer readable medium. The multi-energy-spectrum CT reconstruction method comprises the steps of step 1, obtaining measurement data of an SS-SXCT method or a CSXCT method; step 2, obtaining a coefficient image of a base material component reconstructed based on base material decomposition BMD and a quality attenuation coefficient of the base material; and step 3, reconstructing a multi-energy-spectrum CT image. Compared with the prior art, the method has the advantages of good quality of reconstructed images, low image artifacts and the like.

Description

technical field [0001] The invention relates to the technical field of multi-energy spectrum CT reconstruction, in particular to a multi-energy spectrum CT reconstruction method based on decomposition of basic materials and a computer-readable medium. Background technique [0002] X-ray computed tomography (X-ray computed tomography, XCT) can obtain the internal structure information of the scanning section non-destructively, and has been widely used in the fields of medical diagnosis and industrial inspection. Spectral X-ray computed tomography (SXCT) can take advantage of the different attenuation characteristics of X-ray energy spectrum of substances with different chemical components, and further obtain the material composition information of the scanned object, which can be used to identify CT images Substances with similar grayscales on the When used for clinical diagnosis, it can distinguish contrast and calcification; when it is used for industrial inspection, it ca...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00G06T5/00
CPCG06T11/003G06T5/00G06T2207/10081G06T2207/20024
Inventor 赵生捷张桐邓浩张林
Owner TONGJI UNIV