GPU parallel acceleration dual spectrum CT reconstruction method based on CUDA architecture

Abstract

The present invention discloses a GPU parallel acceleration dual spectrum CT reconstruction method based on a CUDA architecture. Combined with the characteristic of dual energy CT reconstruction, the method of carrying out dual-energy CT rapid analysis reconstruction and obtaining four reconstruction images at the same by using the parallel ability of a GPU based on the CUDA architecture is provided, and the images comprises a post-processing and reconstructed high and low energy line attenuation coefficient image and pre-processing and reconstructed equivalent atomic number and electronic density images. The method has the advantages that the speed is accelerated, the efficiency is promoted, compared with an existing single CT acceleration reconstruction method, according to the dual-energy CT reconstruction method, under the premise of registration, the repeated weight calculation of an original projection and a decomposed projection in a weighting step is avoided, the time of repeatedly calculating the back-projection addresses of the four reconstruction images in a back-projection step is saved, the data access time of a calculation middle process can be reduced. Multiple real parts and imaginary parts can be fully utilized to carry out dual energy synchronization filtering in a filtering step, and when a reconstructed image is increased, no more back-projection time consumption is increased.

Description

technical field [0001] The invention relates to a dual-energy CT analytical reconstruction algorithm in the technical field of X-ray CT, in particular to a GPU parallel acceleration dual-energy spectral CT analytical reconstruction method based on CUDA architecture. Background technique [0002] For the field of CT acceleration, the use of GPU acceleration has become an important method, and the specific acceleration method is the key link to improve the processing speed of CT products. It is not only the core technology researched by technicians in this field, but also directly determines the market competitiveness of products. [0003] Different from single-energy CT reconstruction, dual-energy CT reconstruction is not simply repeated execution of the former, but has its particularity. Dual-energy CT analytical reconstruction algorithms are divided into post-processing reconstruction and pre-processing reconstruction algorithms. Among them, the post-processing reconstruct...

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Problems solved by technology

Among them, the post-processing reconstruction method is consistent with the single-energy CT analytical reconstruction method, which directly reconstructs the projection data and obtains the high and low energy line attenuation coefficient information of the object under inspection. effect, the accuracy of the reconstructed object material is difficult to guarantee; compared with the post-processing algorithm, the pre-processing reconstruction algorithm needs to decompose the dual-energy projection data, and the pre-processing reconstruction algorithm is divided into "basic effect decomposition model" and " Base material decomposition model" two models, the two models are unified, reconstruct the decomposed base material (or base effect) projection data, and then calculate the equivalent atomic number and electron density image based on the reconstructed image of the base material

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