大脑间歇性液体对扩散敏感化方向的依赖:在记忆诊所样本中进行的多b值扩散MRI研究
Merel M van der Thiel1, Noa van der Knaap2, Whitney M Freeze3
1Department of Radiology & Nuclear Medicine, Maastricht University Medical Center, Maastricht, the Netherlands; School for Mental Health & Neuroscience, Maastricht University, Maastricht, the Netherlands; Department of Psychiatry & Neuropsychology, Maastricht University, Maastricht, the Netherlands.
Magnetic resonance imaging
|October 11, 2023
概括
在三组分内素不连贯运动 (3C-IVIM) 成像中,上下 (S-I) 扩散方向对检测间歇性液体 (ISF) 和认知障碍最为敏感. 与标准方法相比,这种S-I方法可能会减少扫描时间.
科学领域:
- 神经成像是一种神经成像.
- 生物物理学的生物物理.
背景情况:
- 三组分的intravoxel不连贯运动 (3C-IVIM) 成像为间歇性液体 (ISF) 提供了一个代理,这对于理解大脑清除至关重要.
- 标准的3C-IVIM分析往往平均扩散方向,可能会在周周血管空间 (PVS) 丰富的大脑区域 (如基底腺 (BG) 和半圆中心 (CSO) 中失去重要的信息.
研究的目的:
- 评估3C-IVIM成像中的个别扩散敏感化方向如何影响PVS丰富地区的间歇性流体 (ISF) 分数测量.
- 探索特定方向的ISF信息在区分认知障碍 (CI) 患者与健康对照 (CON) 的有用性.
主要方法:
- 多个b值扩散加权图像以3特斯拉的速度在三个直角方向 (左-右,前-后,上-下) 中获得.
- 使用非负最小正方形的基于voxel的光谱分析被应用于分析扩散方向特定图像和标准的Trace图像.
- 通过使用统计分析,对3C-IVIM措施进行了跨方向的比较,并在BG和CSO的CI和CON组之间进行了比较.
主要成果:
- 间位液 (ISF) 分数在扩散敏感化方向和基底 (BG) 中的Trace图像之间有显著的变化,上下 (S-I) 方向产生最高的ISF分数.
- 与对照组 (CON) 相比,在认知障碍 (CI) 患者中,在使用仅S-I方向的BG和半圆中心 (CSO) 中,发现了更高的ISF分数.
结论:
- 测量的ISF分数取决于3C-IVIM成像中使用的特定扩散敏感化方向.
- S-I扩散方向对检测ISF和认知障碍和对照组之间的差异最为敏感.
- 仅依赖SI方向可能会为ISF评估提供更敏感的方法,并可能减少MRI扫描时间.
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