Deep learning methods for CT image-domain metal artifact reduction

Lars Gjesteby; Qingsong Yang; Yan Xi; Hongming Shan; Bernhard Claus; Yannan Jin; Bruno De Man; Ge Wang

doi:10.1117/12.2274427

25 September 2017 Deep learning methods for CT image-domain metal artifact reduction

Lars Gjesteby, Qingsong Yang, Yan Xi, Hongming Shan, Bernhard Claus, Yannan Jin, Bruno De Man, Ge Wang

Proceedings Volume 10391, Developments in X-Ray Tomography XI; 103910W (2017) https://doi.org/10.1117/12.2274427
Event: SPIE Optical Engineering + Applications, 2017, San Diego, California, United States

Abstract

Artifacts resulting from metal objects have been a persistent problem in CT images over the last four decades. A common approach to overcome their effects is to replace corrupt projection data with values synthesized from an interpolation scheme or by reprojection of a prior image. State-of-the-art correction methods, such as the interpolation- and normalization-based algorithm NMAR, often do not produce clinically satisfactory results. Residual image artifacts remain in challenging cases and even new artifacts can be introduced by the interpolation scheme. Metal artifacts continue to be a major impediment, particularly in radiation and proton therapy planning as well as orthopedic imaging. A new solution to the long-standing metal artifact reduction (MAR) problem is deep learning, which has been successfully applied to medical image processing and analysis tasks. In this study, we combine a convolutional neural network (CNN) with the state-of-the-art NMAR algorithm to reduce metal streaks in critical image regions. Training data was synthesized from CT simulation scans of a phantom derived from real patient images. The CNN is able to map metal-corrupted images to artifact-free monoenergetic images to achieve additional correction on top of NMAR for improved image quality. Our results indicate that deep learning is a novel tool to address CT reconstruction challenges, and may enable more accurate tumor volume estimation for radiation therapy planning.

Conference Presentation

Citation Download Citation

Lars Gjesteby, Qingsong Yang, Yan Xi, Hongming Shan, Bernhard Claus, Yannan Jin, Bruno De Man, and Ge Wang "Deep learning methods for CT image-domain metal artifact reduction", Proc. SPIE 10391, Developments in X-Ray Tomography XI, 103910W (25 September 2017); https://doi.org/10.1117/12.2274427

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