高质量的脂质抑制和B0闪耀人类大脑H MRSI
Chathura Kumaragamage1, Scott McIntyre1, Terence W Nixon1
1Department of Radiology and Biomedical Imaging, Magnetic Resonance Research Center, USA.
NeuroImage
|September 14, 2024
概括
MC-ECLIPSE通过抑制额外脂和改善B0均性来增强磁共振光谱成像 (MRSI). 这种新的系统实现了完全的轴向大脑覆盖,从而在神经学研究中实现了强大的代谢概况.
科学领域:
- 神经成像是一种神经成像.
- 磁共振光谱学 磁共振光谱学
- 生物医学工程 生物医学工程
背景情况:
- 磁共振光谱成像 (MRSI) 提供非侵入性大脑代谢概况.
- 外脂质污染和B0均性差,限制了当前MRSI的强度和临床使用.
- 像ECLIPSE这样的先前方法改善了脂质抑制,但在某些头形状上减少了轴向覆盖.
研究的目的:
- 引入和评估MC-ECLIPSE平台,用于改进人类大脑质子MRSI.
- 通过实现任意感兴趣区域 (ROI) 形状的外体积抑制 (OVS) 来克服以前技术的局限性,以实现完全的轴承覆盖.
- 为了提高B0场的均性,使用多线圈 (MC) 阵列来实现更强大的MRSI采集.
主要方法:
- 开发了MC-ECLIPSE:一个脉冲的第二阶梯度线圈 (Z2,X2Y2场) 与一个54通道的MC阵列相结合.
- 实现了任意的ROI形OVS,用于全面的轴切片覆盖.
- 利用基于MC的B0场闪,并将其性能与标准的二次波闪和更高阶球形波闪进行了比较.
主要成果:
- MC-ECLIPSE实现了92%至95%的轴向大脑覆盖率,在各种头部形状中随意使用ROI形状的OVS.
- 与标准方法相比,基于MC的B0闪显著改善了同质性 (减少残留场SD),与更高阶闪相比.
- 幻影和体内实验表明了高定位精度,无工件的光谱,以及短回声时间和GABA编辑的MRSI的全轴覆盖.
结论:
- MC-ECLIPSE能够实现全轴覆盖和强大的MRSI采集,克服了以前技术的关键局限性.
- 与标准系统相比,基于MC的B0闪光提供了优越的场均性.
- 这个平台可以对皮质组织进行详细的检查,这对于研究神经和精神疾病至关重要.
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