Deep neural networks-based denoising models for CT imaging and their efficacy

Prabhat KC; Rongping Zeng; M. Mehdi Farhangi; Kyle J. Myers

doi:10.1117/12.2581418

15 February 2021 Deep neural networks-based denoising models for CT imaging and their efficacy

Prabhat KC, Rongping Zeng, M. Mehdi Farhangi, Kyle J. Myers

Proceedings Volume 11595, Medical Imaging 2021: Physics of Medical Imaging; 115950H (2021) https://doi.org/10.1117/12.2581418
Event: SPIE Medical Imaging, 2021, Online Only

Abstract

Most of the Deep Neural Networks (DNNs) based CT image denoising literature shows that DNNs outperform traditional iterative methods in terms of metrics such as the RMSE, the PSNR and the SSIM. In many instances, using the same metrics, the DNN results from low-dose inputs are also shown to be comparable to their high-dose counterparts. However, these metrics do not reveal if the DNN results preserve the visibility of subtle lesions or if they alter the CT image properties such as the noise texture. Accordingly, in this work, we seek to examine the image quality of the DNN results from a holistic viewpoint for low-dose CT image denoising. First, we build a library of advanced DNN denoising architectures. This library is comprised of denoising architectures such as the DnCNN, U-Net, Red-Net, GAN, etc. Next, each network is modeled, as well as trained, such that it yields its best performance in terms of the PSNR and SSIM. As such, data inputs (e.g. training patch-size, reconstruction kernel) and numeric-optimizer inputs (e.g. minibatch size, learning rate, loss function) are accordingly tuned. Finally, outputs from thus trained networks are further subjected to a series of CT bench testing metrics such as the contrast-dependent MTF, the NPS and the HU accuracy. These metrics are employed to perform a more nuanced study of the resolution of the DNN outputs' low-contrast features, their noise textures, and their CT number accuracy to better understand the impact each DNN algorithm has on these underlying attributes of image quality.

Conference Presentation

Citation Download Citation

Prabhat KC, Rongping Zeng, M. Mehdi Farhangi, and Kyle J. Myers "Deep neural networks-based denoising models for CT imaging and their efficacy", Proc. SPIE 11595, Medical Imaging 2021: Physics of Medical Imaging, 115950H (15 February 2021); https://doi.org/10.1117/12.2581418

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