Magnetic Susceptibility Source Separation Solely from Gradient Echo Data: Histological Validation.

Magnetic Susceptibility Source Separation Solely from Gradient Echo Data: Histological Validation.
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磁化率源源仅从梯度回声数据中分离:组织学验证。

DOI:
10.3390/tomography8030127
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发表时间:
2022-06-14
期刊:
Tomography (Ann Arbor, Mich.)
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其他
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定量磁化率成像(QSM)有助于从复杂梯度回波(GRE) MRI数据的相位绘制组织的整体磁化率。QSM相位处理与多回波梯度回波数据的幅度模型相结合(),允许分离对价值有建设性贡献但对体素的QSM值有破坏性贡献的中磁性和准磁性成分(例如髓磷脂和铁)。对10例离体多发性硬化症病变边缘和核心的髓鞘碱性蛋白的定量组织学光密度和Perls '铁组织学染色,以及邻近正常出现的白质进行了验证。我们发现源图与组织学有很好的定性一致,例如,显示边缘+病变边缘铁浓度增加,病变核心髓磷脂丢失。此外,我们的研究结果表明,在Perls和MPB染色的光密度和估计的顺磁性和抗磁性组织成分之间存在统计学上显著的相关性。这些发现为仅基于GRE复合体数据的磁源分离表征MS病变组成提供了直接支持。
Quantitative susceptibility mapping (QSM) facilitates mapping of the bulk magnetic susceptibility of tissue from the phase of complex gradient echo (GRE) MRI data. QSM phase processing combined with an model of magnitude of multiecho gradient echo data () allows separation of dia- and para-magnetic components (e.g., myelin and iron) that contribute constructively to value but destructively to the QSM value of a voxel. This technique is validated against quantitative histology—optical density of myelin basic protein and Perls’ iron histological stains of rim and core of 10 ex vivo multiple sclerosis lesions, as well as neighboring normal appearing white matter. We found that source maps are in good qualitative agreement with histology, e.g., showing increased iron concentration at the edge of the rim+ lesions and myelin loss in the lesions’ core. Furthermore, our results indicate statistically significant correlation between paramagnetic and diamagnetic tissue components estimated with and optical densities of Perls’ and MPB stains. These findings provide direct support for the use of magnetic source separation based solely on GRE complex data to characterize MS lesion composition.
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