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诱导和转移恢复稳定状态 (iSTRESS) 用CEST MRI进行质子交换率映射,这是一个初步研究

Mehran Shaghaghi¹, Frederick C Damen¹, Weiguo Li²

¹Department of Radiology, University of Illinois at Chicago, Chicago, IL 60612, USA.

Magnetic resonance imaging

|March 24, 2024

概括

一种新的MRI技术,诱导和转移恢复稳定状态 (iSTRESS),显著减少了绘制质子交换率 (kex) 的扫描时间. 这种方法降低了特定吸收率 (SAR),提高了脑成像应用的临床可行性.

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.
医学物理医学物理

背景情况:

质子交换对于各种MRI对比度至关重要.
欧米茄图表为神经学应用绘制了质子交换率 (kex),但需要长时间的和时间,并导致高的特定吸收率 (SAR).

研究的目的:

引入和验证诱导和转移恢复稳定状态 (iSTRESS),一种新的kex映射技术.
为了减少和时间,并减轻与现有的kex映射方法相关的SAR问题.

主要方法:

在化学交换和转移 (CEST) 和之前,通过整合激发翻转角度脉冲来开发iSTRESS.
从理论上获得了iSTRESS kex量化公式,并通过Bloch-McConnell模拟进行了验证.
在9.4T临床前MRI上实施了iSTRESS MRI序列,从具有不同pH的蛋白质幻影中获取数据.

主要成果:

布洛赫-麦康奈尔模拟显示iSTRESS和输入kex值之间有很好的一致性 (R2>0.99).
幻影研究表明,iSTRESS和Omega图谱衍生的kex地图之间存在线性相关性 (R2>0.99).
iSTRESS实现了低于1秒的和时间的kex映射,显著降低了SAR.

结论:

通过iSTRESS,可以准确量化kex,并大大缩短和时间.
iSTRESS方法为绘制质子交换率提供了临床可行的替代方案,解决了当前技术的SAR限制.

关键词:

在CEST中,CEST是CEST.质子汇率映射质子汇率映射

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