A metal artifact correction method for a head CT image

Abstract

The invention discloses a metal artifact correction method for a head CT image, and the method comprises the steps of firstly, building a database which contains and does not contain the artifact headCT image, and carrying out the preprocessing of data through employing a deformable image registration method before the training of a convolutional neural network (CNN); secondly, constructing a simple 17-layer CNN architecture in training to learn metal artifacts, and adopting a GPU to accelerate the speed of training data, so that the learning efficiency of the network is improved. Meanwhile,experimental results show that the method has good metal artifact correction capability, and the PSNR and SSIM values are also obviously improved.

Description

technical field [0001] The invention belongs to metal artifact correction technology, in particular to a metal artifact correction method for head CT images. Background technique [0002] Computed tomography (CT) is one of the commonly used equipment in the medical and industrial fields. It uses a specific CT reconstruction algorithm to obtain slice images, which plays an important role in disease diagnosis and defect inspection. In CT scanning, as a high-density object, the attenuation coefficient of metal to X-rays is much higher than that of human tissue. If there are high-attenuation substances similar to metals during the scanning process, X-rays will be sharply attenuated when passing through these objects. As a result, the corresponding projection data is distorted, and artifacts appear in the reconstructed image. When there is only a single metal in the imaged object, the metal artifacts appear as radial artifacts around it; when there are many metal objects and the...

AI Technical Summary

Problems solved by technology

Linear interpolation (LI) is a traditional method to reduce metal artifacts, which uses interpolation technology to replace the part affected by metal in the original projection data, so as to achieve the purpose of removing metal artifacts, but this method is easy to produce new artifacts , resulting in structural deformation of parts with severe metal artifacts

Iterative reconstruction (LR) is a traditional method of clinical CT, which is limited by the performance of experimental equipment due to the large amount of calculation required

[0004] In summary, although there are many existing hardening artifact correction methods, they all have their own limitations in specific applications.

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