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在单一协议中使用2D多切片短TE和GABA编辑的Spin-EchoMRSI在3T的代谢映射的可重现性

Helge J Zöllner¹, Dillip K Senapati¹, İpek Özdemir¹

¹Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.

NMR in biomedicine

|November 20, 2025

概括

这项研究表明,3T-MRSI可以可靠地绘制tNAA和tCr等主要大脑代谢物. 虽然GABA+映射显示了挑战,但该协议为健康志愿者的关键代谢物提供了可重现的结果.

科学领域:

神经成像是一种神经成像.
代谢成像成像 - 代谢成像
磁共振光谱成像技术 (MRSI) 的应用

背景情况:

MRSI是一种用于绘制代谢分布的非侵入性技术,对于不确定异常位置的疾病至关重要.
高度代谢物可在3T时检测到未经编辑的MRSI,但像GABA这样的低度代谢物需要由于光谱重叠而进行专门的编辑.

研究的目的:

评估结合同局部短回声时间 (TE) 和GABA编辑的多切片旋回回声2DMRSI在3T的协议的可重现性.
在健康志愿者中量化代谢物度相对于总肌酸 (tCr) 和水.

主要方法:

多切片,短TE (20毫秒) 和GABA编辑 (68毫秒) 的MRSI在3T时对11名健康志愿者 (7-43岁) 进行了两次.
数据分析涉及回顾性运动补偿,共识处理和在Osprey软件中的线性组合建模.
六种代谢物的代谢物估计量化在14个感兴趣的区域,通过内部和主体间变化系数 (CVs) 评估可重现性.

主要成果:

短期TE MRSI显示tNAA,tCr,tCho,mI和Glx的高可重现性,其中77%的地区在两次访问中都满足了质量控制 (QC). 平均人体内CVs为5.8% (水参考) 和4.8% (tCr参考).
GABA+映射可重现性更具挑战性,有46%的voxels在两次访问中都遇到了QC. 在两次访问中,满足QC的数据集产生了可接受的可复制性 (受试者内部CV为13.5%).
总的来说,3T-MRSI序列证明了五种主要代谢物 (tNAA,tCr,tCho,mI,Glx) 的可复制映射,并扩展了大脑覆盖范围.

结论:

开发的3T-MRSI协议实现了大脑主要代谢物 (tNAA,tCr,tCho,mI,Glx) 在扩展的大脑覆盖范围的可重复映射.
尽管在符合严格QC标准的数据集中获得了可接受的结果,但GABA+映射可重现性仍然是一个挑战,其中很大一部分数据需要拒绝.
这些发现支持该MRSI协议在临床研究和潜在应用中用于定量代谢映射的有用性.

关键词:

2D 旋转回声在GABA+的基础上,GABA+在 MRSI 和 MRSI 中,编辑的 MRSI 编辑.线性组合建模的线性组合建模可复制性的可复制性

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