旋转和梯度多重重叠回声分离成像 (SAGE-MOLED):高效的T2,T 2 * <注>$$ {T}_2^{\ast } $$ ,以及M0用于同时进行透和透度测量的映射
Qinqin Yang1,2, Jianfeng Bao3, Lu Wang1
1Department of Electronic Science, Xiamen University, Xiamen, China.
Magnetic resonance in medicine
|November 2, 2025
概括
一种新的SAGE-MOLED技术通过减少扭曲并实现准确的T2,T2*和M0映射来改善MRI. 这允许在动态 perfusion MRI 中高效,同时量化通透性和 perfusion 参数.
科学领域:
- 磁共振成像 (MRI) 是一种磁共振成像技术.
- 医学物理 医学物理
- 放射学 放射学是一门学科.
背景情况:
- 组合旋转和梯度回声EPI (SAGE-EPI) 对于组织量化和动态成像非常有用.
- SAGE-EPI受到低空间分辨率和几何扭曲的限制.
研究的目的:
- 开发一种使用多重重叠回声分离 (SAGE-MOLED) 的新型SAGE采集.
- 为了实现高效,扭曲纠正的T2,T2*和M0映射用于 perfusion MRI.
主要方法:
- SAGE-MOLED改进了回声时间采样,并使用多列车闪点逆转EPI来改善扭曲校正和时间SNR.
- 在来自Bloch模拟的合成数据上训练的深度学习模型可以实现高效的多参数量化.
- 为准确估计透性和泄漏纠正 perfusion 参数,制定了一个信号到度模型.
主要成果:
- 在幻影和体内实验中,SAGE-MOLED与标准方法具有很高的一致性 (Pearson的r>0.988用于T2和T2*映射).
- 与传统的SAGE-EPI相比,SAGE-MOLED有效地减轻了几何扭曲和信号损失.
- 动态SAGE-MOLED可同时通过单次对比注射进行透性和泄漏纠正的 perfusion 参数估计.
结论:
- SAGE-MOLED克服了SAGE-EPI的局限性,提供高准确度,扭曲纠正的定量地图.
- 这种技术可以在动态MRI中同时量化透性和 perfusion 参数.
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