Adaptive Self-Supervised Consistency-Guided Diffusion Model for Accelerated MRI Reconstruction

• URL: http://arxiv.org/abs/2406.15656v1
• Date: Fri, 21 Jun 2024 21:22:17 GMT
• Title: Adaptive Self-Supervised Consistency-Guided Diffusion Model for Accelerated MRI Reconstruction
• Authors: Mojtaba Safari, Zach Eidex, Shaoyan Pan, Richard L. J. Qiu, Xiaofeng Yang,
• Abstract summary: We propose a self-Supervised deep learning compressed Diffusion sensing MRI (DL)" method. We used 1,376 and singlecoil brain axial post T1 dataset (T1-w) 50 patients. It was compared with ReconFormer Transformer and SS-MRI, assessing performance using normalized mean error (NMSE), peak signal-to-noise ratio (PSNR), and similarity index (SSIM)
• Score: 1.167578793004766
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Purpose: To propose a self-supervised deep learning-based compressed sensing MRI (DL-based CS-MRI) method named "Adaptive Self-Supervised Consistency Guided Diffusion Model (ASSCGD)" to accelerate data acquisition without requiring fully sampled datasets. Materials and Methods: We used the fastMRI multi-coil brain axial T2-weighted (T2-w) dataset from 1,376 cases and single-coil brain quantitative magnetization prepared 2 rapid acquisition gradient echoes (MP2RAGE) T1 maps from 318 cases to train and test our model. Robustness against domain shift was evaluated using two out-of-distribution (OOD) datasets: multi-coil brain axial postcontrast T1 -weighted (T1c) dataset from 50 cases and axial T1-weighted (T1-w) dataset from 50 patients. Data were retrospectively subsampled at acceleration rates R in {2x, 4x, 8x}. ASSCGD partitions a random sampling pattern into two disjoint sets, ensuring data consistency during training. We compared our method with ReconFormer Transformer and SS-MRI, assessing performance using normalized mean squared error (NMSE), peak signal-to-noise ratio (PSNR), and structural similarity index (SSIM). Statistical tests included one-way analysis of variance (ANOVA) and multi-comparison Tukey's Honesty Significant Difference (HSD) tests. Results: ASSCGD preserved fine structures and brain abnormalities visually better than comparative methods at R = 8x for both multi-coil and single-coil datasets. It achieved the lowest NMSE at R in {4x, 8x}, and the highest PSNR and SSIM values at all acceleration rates for the multi-coil dataset. Similar trends were observed for the single-coil dataset, though SSIM values were comparable to ReconFormer at R in {2x, 8x}. These results were further confirmed by the voxel-wise correlation scatter plots. OOD results showed significant (p << 10^-5 ) improvements in undersampled image quality after reconstruction.

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