扩散加权快速旋转回声与RF编码板,用于便携式低场MRI系统.
Philip K Lee1, Yueqi Qiu1, Suen Chen1
1School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, People's Republic of China.
Magnetic resonance in medicine
|February 25, 2026
概括
一种新的扩散加权快速自旋回声 (DW-FSE) 技术在便携式MRI系统上提供无扭曲,高SNR成像. 这种强大的方法实现了临床上可行的扫描时间,改善了低场MRI环境中的诊断能力.
科学领域:
- 磁共振成像是一种磁共振成像技术.
- 扩散加权成像是一种扩散加权成像.
- 医疗器械技术 医疗器械技术
背景情况:
- 便携式MRI系统提供了可访问性,但在图像质量和高级序列的扫描时间方面面临挑战.
- 扩散加权成像 (DWI) 对于神经评估至关重要,但像回声平面成像 (EPI) 这样的传统方法容易产生文物和硬件需求.
- 开发强大的DWI技术用于低场便携式MRI对于扩大其临床实用性至关重要.
研究的目的:
- 为便携式MRI系统开发强大的扩散权重 (DW) 采集技术.
- 为了实现在临床上可行的扫描时间用于低场系统上的DW成像.
- 在便携式MRI设置中克服现有的DWI方法的局限性.
主要方法:
- 为板块扩散权重快旋回声 (DW-FSE) 数据开发了一种线性重建模型,其中包含了定制的射频编码,运动诱导的相位和系统的相位错误.
- 使用幻影校准了系统相位错误,并将DW-FSE技术与在110mT便携式系统上的DW-EPI实体比较.
- 用回顾性低样本来评估图像质量和扩散度变化,在临床上可行的扫描时间内进行.
主要成果:
- 开发的RF编码板DW-FSE技术产生了微量化图像,没有扭曲工件,并且与DW-EPI相比 voxel 尺寸小了5倍.
- 通过计算各种相源,可以准确地估计运动诱导的相位,并减少幽灵艺术品.
- 扫描时间为12分钟,允许12厘米的切片覆盖2.5x2.5x5毫米3的voxel大小,证明了临床可行性的潜力.
结论:
- 扩散权重的FSE是一种强大的,没有扭曲的方法,用于在便携式MRI系统上高信号噪声比 (SNR) 效率的DWI.
- 这种多频段二次阶段增量DW-FSE技术有效地利用低场强度,在SAR,峰值B1和硬件依赖性方面比DW-EPI具有优势.
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