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A nonlocal spectral similarity-induced material decomposition method for noise reduction of dual-energy CT images / 南方医科大学学报
Journal of Southern Medical University ; (12): 724-732, 2022.
Article in Chinese | WPRIM | ID: wpr-936369
ABSTRACT
OBJECTIVE@#To propose a nonlocal spectral similarity-induced material decomposition network (NSSD-Net) to reduce the correlation noise in the low-dose spectral CT decomposed images.@*METHODS@#We first built a model-driven iterative decomposition model for dual-energy CT, optimized the objective function solving process using the iterative shrinking threshold algorithm (ISTA), and cast the ISTA decomposition model into the deep learning network. We then developed a novel cost function based on the nonlocal spectral similarity to constrain the training process. To validate the decomposition performance, we established a material decomposition dataset by real patient dual-energy CT data. The NSSD-Net was compared with two traditional model-driven material decomposition methods, one data-based material decomposition method and one data-model coupling-driven material decomposition supervised learning method.@*RESULTS@#The quantitative results showed that compared with the two traditional methods, the NSSD-Net method obtained the highest PNSR values (31.383 and 31.444) and SSIM values (0.970 and 0.963) and the lowest RMSE values (2.901 and 1.633). Compared with the datamodel coupling-driven supervised decomposition method, the NSSD-Net method obtained the highest SSIM values on water and bone decomposed results. The results of subjective image quality assessment by clinical experts showed that the NSSD-Net achieved the highest image quality assessment scores on water and bone basis material (8.625 and 8.250), showing significant differences from the other 4 decomposition methods (P < 0.001).@*CONCLUSION@#The proposed method can achieve high-precision material decomposition and avoid training data quality issues and model unexplainable issues.
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Full text: Available Index: WPRIM (Western Pacific) Main subject: Algorithms / Image Processing, Computer-Assisted / Water / Tomography, X-Ray Computed / Phantoms, Imaging / Signal-To-Noise Ratio Type of study: Prognostic study Limits: Humans Language: Chinese Journal: Journal of Southern Medical University Year: 2022 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Algorithms / Image Processing, Computer-Assisted / Water / Tomography, X-Ray Computed / Phantoms, Imaging / Signal-To-Noise Ratio Type of study: Prognostic study Limits: Humans Language: Chinese Journal: Journal of Southern Medical University Year: 2022 Type: Article