In vivo assessment of anisotropy of apparent magnetic susceptibility in white matter from a single orientation acquisition

In vivo assessment of anisotropy of apparent magnetic susceptibility in white matter from a single orientation acquisition
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通过单方向采集对白质表观磁化率各向异性进行体内评估

DOI:
10.1016/j.neuroimage.2021.118442
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发表时间:
2021
期刊:
影响因子:
5.7
通讯作者:
Reichenbach JR
Reichenbach JR
中科院分区:
医学1区
文献类型:
--
作者:
Sibgatulin R;Güllmar D;Deistung A;Ropele S;Reichenbach JR

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多项研究已经报道了有效横向弛豫速率常数(R 2*)和基于梯度回波(GRE)信号的相位对人脑中白色物质纤维的取向的显著依赖性。也有人假设,磁化率,通过单向定量磁化率映射(QSM),表现出这种依赖性。在这项研究中,我们在一组健康志愿者中调查了这种假设的关系。我们发现,R 2* 遵循一致的预测方向依赖性在整个白色物质区域,而明显的磁化率是不同的纤维方向在整个大脑,往往在一个复杂的非单调的方式。此外,我们探讨了通过扩散加权MRI测量的分数各向异性对取向依赖性强度的影响,并在许多区域仅观察到有限的影响。然而,仔细考虑这样的影响和偶极子反转过程的不适定性所施加的限制,有可能在特定的大脑区域研究磁化率各向异性与一个单一的方向采集。
Multiple studies have reported a significant dependence of the effective transverse relaxation rate constant (R 2*) and the phase of gradient-echo based (GRE) signal on the orientation of white matter fibres in the human brain. It has also been hypothesized that magnetic susceptibility, as obtained by single-orientation quantitative susceptibility mapping (QSM), exhibits such a dependence. In this study, we investigated this hypothesized relationship in a cohort of healthy volunteers. We show that R 2* follows the predicted orientation dependence consistently across white matter regions, whereas the apparent magnetic susceptibility is related differently to fibre orientation across the brain and often in a complex non-monotonic manner. In addition, we explored the effect of fractional anisotropy measured by diffusion-weighted MRI on the strength of the orientation dependence and observed only a limited influence in many regions. However, with careful consideration of such an impact and the limitations imposed by the ill-posed nature of the dipole inversion process, it is possible to study magnetic susceptibility anisotropy in specific brain regions with a single orientation acquisition.
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