arXiv:2607.02428eess.IVcs.CV2026-07

提出自检残差漂移模型,加速膝关节MRI同时保持病灶结构清晰、推理快。

Self-Auditing Residual Drifting for Pathology-Preserving Accelerated Knee MRI

论文配图:Self-Auditing Residual Drifting for Pathology-Preserving Accelerated Knee MRI
图 1 · 摘自论文原文
  • 用物理约束的残差漂移模型,从欠采样数据逐步恢复图像细节。
  • 在加速度4~12下SSIM最高,每切片推理<1秒,优于扩散模型等方法。
  • 可生成错误热图和风险评分,适合临床医生快速筛查高风险重建结果。

加速磁共振成像可缩短扫描时间,但欠采样k-space的重建可能导致诊断相关结构模糊或引入未被全局指标捕捉的失败。本文提出SA-RDM-DC:一种基于数据一致性的自检残差生成漂移模型,用于加速膝关节MRI。该方法通过训练从零填充重建到全采样残差修正的物理条件漂移场,预测图像与缺失k-space的残差修正,强制满足采集k-space的数据一致性,并采用频域感知与残差漂移监督以恢复细粒度结构,同时在一次推理中输出密集误差图与切片级风险评分。我们在多线圈fastMRI膝关节数据集上评估了加速度因子4、8、12的情况,使用fastMRI+病理标注进行区域级与分类任务保真度分析,并在SKM-TEA数据集上测试零样本与微调协议迁移性能。相比零填充、UNet-image-SENSE、DC-UNet、Score-Diffusion、ELF-Diff、SENSE-VarNet和MoDL等基线,SA-RDM-DC在所有加速因子下均取得最高SSIM,且每切片推理时间低于1秒,避免了迭代扩散模型的长采样时间。病理感知分析显示,该方法有效保持病灶区结构保真度,降低半月板检测不稳定性;其自检评分在fastMRI上能准确识别高误差重建,并在SKM-TEA协议迁移下部分转移为选择性审查信号。结果支持兼顾图像保真度、病理保留、运行效率与病例可靠性的一体化重建评估。

原文摘要 · Abstract (English)

Accelerated magnetic resonance imaging reduces acquisition time, but reconstruction from undersampled k-space can blur diagnostically relevant structures or introduce failures that are not captured by global image metrics. We propose SA-RDM-DC, a Self-Auditing Residual generative Drifting Model with Data Consistency for accelerated knee MRI. The method adapts the newly proposed generative drifting paradigm to accelerated MRI by training a physics-conditioned drift field from the zero-filled reconstruction toward the fully sampled residual correction. It predicts image- and missing-k-space residual corrections, enforces data consistency with acquired k-space, uses frequency-aware and residual drifting supervision to recover fine detail, and produces dense error maps and slice-level risk scores in the same inference pass. We evaluate SA-RDM-DC on multi-coil fastMRI knee data at acceleration factors of 4, 8, and 12, with fastMRI+ pathology annotations for region-level and classifier-based task preservation, and on SKM-TEA for zero-shot and fine-tuned protocol-shift evaluation. Compared with zero-filled reconstruction, UNet-image-SENSE, DC-UNet, Score-Diffusion, ELF-Diff, SENSE-VarNet, and MoDL baselines, SA-RDM-DC achieves the highest SSIM across fastMRI acceleration factors while retaining subsecond per-slice inference and avoiding the long sampling time of iterative diffusion baselines. In pathology-aware analysis, SA-RDM-DC preserves lesion-region structural fidelity and reduces meniscus prediction instability. Its self-auditing scores strongly identify high-error reconstructions on fastMRI and partially transfer as a selective-review signal under SKM-TEA protocol shift. These results support reconstruction evaluation that jointly considers image fidelity, pathology preservation, runtime, and case-specific reliability.

MRI加速病理保真自检机制生成模型

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