CT image reconstruction method under condition that CT projection paths are reduced

Abstract

The invention relates to a CT image reconstruction method under the condition that CT projection paths are reduced. The CT image reconstruction method comprises the following steps: obtaining a seriesof continuous incomplete projections through scanning in different incomplete projection modes, and obtaining a CT image sequence through reconstruction; performing CT image spatial information datarecovery and image reconstruction by using a deep convolutional neural network; in a network training process, firstly, utilizing a data set of incomplete projection for pre-training a network, then,utilizing a complete data set for carrying out large-scale iterative training on the network, and obtaining an incomplete projection CT spatial information data recovery model; and inputting the realincomplete projection CT image slice into a data recovery model to obtain a high-quality CT reconstructed image. The CT image reconstruction method is reasonable in design, can obtain the high-qualityCT reconstructed image with high contrast, high definition and good detail description, and can greatly improve the reconstruction quality of the incomplete projection CT image under the condition that the X-ray tube current is reduced and the projection path is reduced.

Description

technical field [0001] The invention belongs to the technical field of computer images, in particular to a CT image reconstruction method under the condition of reduced CT projection paths. Background technique [0002] X-ray computed tomography (Computed Tomography, CT) technology has been widely used in industrial detection and medical diagnosis and other fields. However, since the high radiation dose of X-rays in CT examination will have adverse effects on human health, the development of low-dose CT is the focus and hotspot of research in this field. [0003] At present, one of the most direct ways to reduce the radiation dose of CT is to reduce the tube current or tube voltage of the X-ray tube, but directly reducing the tube current will increase the noise level of the projection data, which will lead to obvious noise plaques in the reconstructed image; Reducing the voltage of the X-ray tube will reduce the penetration ability of the X-ray, resulting in severe beam ha...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, and propose a CT image reconstruction method under the condition of reduced CT projection path, which uses deep convolutional neural network to extr

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