在中风中使用双对比CESTMRI进行pH加权成像
Julius Chung1, Dandan Sun2, T Kevin Hitchens3
1Department of Radiology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
Magnetic resonance in medicine
|October 6, 2023
概括
我们优化了pH增强 (pHenh) 的MRI用于中风成像,开发了pHdual. 这种新方法提高了pH的灵敏度,降低了背景噪声,从而更好地评估中风患者的大脑组织活力.
科学领域:
- 磁共振成像技术 磁共振成像技术
- 生物医学工程 生物医学工程
- 神经成像是一种神经成像.
背景情况:
- 化学交换和转移 (CEST) MRI对pH值的变化很敏感.
- 现有的pH增强 (pHenh) CEST成像结合了胺和瓜尼迪诺质子信号,但缺乏优化的和参数.
- 精确的pH成像对于评估中风中缺血性脑损伤至关重要.
研究的目的:
- 为了优化pH的和参数. CEST成像.
- 开发一种变体,pHdual,以提高pH灵敏度和减少背景信号变化.
- 为了评估pHdual在中风中成像急性缺血性脑损伤的潜力.
主要方法:
- 进行模拟和体内动物中风实验,使用pHenhMRI.
- 对胺和瓜尼迪诺质子的多种射频 (RF) 和功率,以优化对比度并最大限度地减少信号变化.
- 在急性中风中比较pH双成像,使用胺-CEST, perfusion 和扩散MRI技术.
主要成果:
- 模拟显示了对胺和瓜尼迪诺CEST信号的独特pH敏感性.
- 优化的射频和功率对 (在2.0ppm时0.5μT,在3.6ppm时1.0μT) 最大化了损伤/正常组织对比度.
- 最佳对比度 (CVR) 达到0.7μT在2.0ppm和0.8μT在3.6ppm时.
- pHdual在急性中风中表现出比三点胺-CEST方法更高的灵敏度,与扩散和 perfusion MRI 相比,显示出明显的损伤模式.
结论:
- pH双重MRI增强了pH加权成像的灵敏度.
- 优化的方法为评估中风中的组织活力提供了有价值的工具.
- pH双成像可以更好地描述缺血性脑损伤的特征.
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