Priori-independent single-energy-spectrum CT line integral domain material sparse reconstruction method
A sparse reconstruction and line integration technology, applied in the field of medical engineering, can solve the problems that the quality of material reconstruction depends on the quality of CT images, the implementation process is cumbersome, and the high-end clinical application of material reconstruction technology is limited, so as to improve the quality of material images and reduce the initial value. Rely on, expand the effect of the scope of application
Pending Publication Date: 2021-01-12
苏州动影信息科技有限公司
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[0003] At present, material reconstruction is mostly carried out on CT images. It is necessary to reconstruct the CT image first, and then decompose the material to achieve material reconstruction. This method is cumbersome to implement, and the quality of material reconstruction depends on the quality of CT images, which limits the clinical high-end of material reconstruction technology. application
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[0087] The embodiment adopts digital phantom data as a data source, such as figure 1 The low- and high-energy line integrals of the digital phantoms shown in (a) and (b) were used as data sources.
[0088] Using the priori-independent single-energy spectrum CT line integral domain material sparse reconstruction method for high-energy line integrals to reconstruct materials, the decomposition results are as follows figure 2 (a) ~ (d) in.
[0089] Using the priori-independent single-energy spectrum CT line integral domain material sparse reconstruction method provided by the present invention to perform material reconstruction on low-energy line integrals, the decomposition results are as follows image 3 (a) ~ (d) in.
[0090] The quantitative analysis results using the priori-independent single-energy spectrum CT line integral domain material sparse reconstruction method provided by the present invention are shown in Table 1, and the numbers in the table represent the volum...
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The invention discloses a priori-independent single-energy-spectrum CT line integral domain material sparse reconstruction method, which comprises the following steps: (1) collecting single-energy-spectrum CT projection data, and converting the single-energy-spectrum CT projection data into line integral data; (2) achieving sparse representation of the material through constraint of a fractional norm, and achieving piecewise constant constraint of a material image by using a 0-norm of a gradient, so that the quality of the material image is further improved; (3) by using a priori-independent line search acceleration dual algorithm, reducing the dependence of the reconstruction process on an initial value, and expanding the application range of the method; and finally, achieving direct reconstruction from line integral data to a material image .
Description
technical field [0001] The invention relates to the technical field of medical engineering, in particular to a priori-independent single-energy spectrum CT line integral domain material sparse reconstruction method. Background technique [0002] In high-end CT applications, such as virtual deiodination, virtual monoenergetic, liver fat ratio quantification, and liver fiber quantification, material reconstruction technology has shown important application value. [0003] At present, material reconstruction is mostly carried out on CT images. It is necessary to reconstruct the CT image first, and then decompose the material to achieve material reconstruction. This method is cumbersome to implement, and the quality of material reconstruction depends on the quality of CT images, which limits the clinical high-end of material reconstruction technology. application. Contents of the invention [0004] The purpose of the present invention is to address the deficiencies of the pri...
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Login to View More IPC IPC(8): G06T11/00G06F17/15
CPCG06T11/003G06F17/15G06T11/005
Inventor 牛田野薛一罗辰
Owner 苏州动影信息科技有限公司