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对T₂的梯度回声平面成像优化*在0.5T时在大脑中的对比度

Arjama Halder¹, Chad T Harris², Curtis N Wiens²

¹Department of Medical Biophysics, Western University, London, ON N6A 3K7, Canada.

Sensors (Basel, Switzerland)

|October 28, 2023

概括

这项研究引入了T2*对比效率,以优化在中场MRI (0.5T) 中的梯度回忆回声平面成像 (GRE EPI). 优化的协议减少了死亡时间,提高了功能性MRI和其他应用程序的扫描效率.

科学领域:

磁共振成像 (MRI) 是一种磁共振成像技术.
生物物理学的生物物理.

背景情况:

梯度回忆回声平面成像 (GRE EPI) 对fMRI,SWI和PRF温度计至关重要.
中场MRI (<1 T) 面临的挑战是长T2*和低极化,限制了GRE EPI的应用.
具有高性能梯度的中场扫描器的进步使GRE EPI可行性的重新评估成为可能.

研究的目的:

引入一个"T2*对比效率"指标来评估中场GRE EPI.
优化EPI序列以最大限度地减少死亡时间,并最大限度地提高T2*对比度,以改善时间和伪SNR.
为未来的中场fMRI研究量化实验参数.

主要方法:

在0.5 T的皮质灰质中进行T2*测量,重点关注特定的ROI.
使用时间序列EPI数据计算时间和伪SNR.
确定最大T2*对比效率的最佳回声时间.

主要成果:

报告了0.5T时特定皮质ROI的T2*测量结果.
发现EPI协议的优化回声时间比该地区的有效T2*要短.
在回声列车之前有效地减少死亡时间被证明是可行的.

结论:

优化的EPI协议可以显著减少0.5T的死亡时间.
这种优化提高了GRE EPI应用在中场MRI中的整体扫描效率.
该研究为未来的中场fMRI实验参数量化提供了一个框架.

关键词:

这是一个大胆的表现.这是一个SNR,SNR是SNR.T2*对比效率高,比较高的功能性核磁共振成像 (MRI) 功能性核磁共振成像梯度系统的梯度系统.渐变回声 EPI 的变化中场MRI (\({\textless{}}\) 1 T) 是一个中场MRI.多个回声EPI.沉降速度的速度是多少

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