Calculation method of aperture weighting in spiral CT (computed tomography) image reconstruction based on GPU (graphic processing unit) acceleration
An aperture weighted, CT image technology, applied in the field of medical image processing, can solve the problem of not mentioning GPU acceleration, and achieve the effect of solving high consumption characteristics, improving efficiency, and solving unevenness
Active Publication Date: 2013-07-24
SHANGHAI UNITED IMAGING HEALTHCARE
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However, this article only conducts a basic theoretical analysis of this weighting function, and does not involve how to implement it, let alone how to use the GPU to accelerate it.
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[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0043] figure 1It is a flow chart of the steps of the calculation method for aperture weighting in multi-slice spiral CT image reconstruction of the present invention, figure 2 It is a schematic diagram of the relationship between the aperture weighted value and the coordinates of the detector in the Z direction in the multi-slice spiral CT image reconstruction of the present invention.
[0044] See figure 1 , the calculation method of aperture weighting in the multi-slice spiral CT image reconstruction based on GPU acceleration provided by the present invention comprises the following steps:
[0045] First, in step S101, the aperture weighted value of all symmetrical rays of each voxel point is determined according to the following formula (1): ;
[0046] (1)
[0047] Aperture weighted value is to multiply a coefficient on each detectio...
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The invention provides a calculation method of aperture weighting in spiral CT (computed tomography) image reconstruction based on GPU (graphic processing unit) acceleration. The calculation method comprises the following steps of a, determining aperture weighting values of all symmetrical rays of each voxel; b, carrying out the summation of the aperture weighting values of all symmetrical rays of each voxel, and obtaining the aperture weighting value of the voxel; and c, carrying out normalization calculation on the aperture weighting values of all voxels, and obtaining the aperture weighting value after the normalization of each voxel. According to the aperture weighting method, non-smoothness of detection data of an edge detector unit is effectively solved, and a conditional statement is not needed, but the accurate calculation of the aperture weighting and normalized value in multi-layered spiral CT image reconstruction can be realized, thus the quality of a reconstructed image and the efficiency of the reconstruction calculation method are improved.
Description
technical field [0001] The present invention relates to medical image processing technology, in particular to a calculation method of aperture weighting in spiral CT image reconstruction based on GPU acceleration. Background technique [0002] The image reconstruction speed of multi-slice spiral CT has always been a hot spot in the research of CT technology. The more common technologies in the existing acceleration methods can be divided into three types: [0003] The first type is to use CPU clusters for accelerated computing. For example, Chinese patent No. CN02805089.4 discloses a fast parallel cone beam reconstruction system and method using one or more microprocessor CPUs. However, this method is only for cone beam reconstruction, and does not mention the reconstruction scheme related to multi-slice spiral CT, and the CPU is expensive, and the cost to achieve a better acceleration effect is relatively high. [0004] The second type is acceleration using special computi...
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IPC IPC(8): A61B6/03
Inventor 全国涛
Owner SHANGHAI UNITED IMAGING HEALTHCARE