Mapping Caudolenticular Gray Matter Bridges in the Human Brain Striatum Through Diffusion Magnetic Resonance Imaging and Tractography

IF 3.3 2区 医学 Q1 NEUROIMAGING
Graham Little, Charles Poirier, Arnaud Bore, Martin Parent, Laurent Petit, Maxime Descoteaux
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引用次数: 0

Abstract

In primates, the putamen and the caudate nucleus are connected by ~1 mm-thick caudolenticular gray matter bridges (CLGBs) interspersed between the white matter bundles of the internal capsule. Little is understood about the functional or microstructural properties of the CLGBs. In studies proposing high resolution diffusion magnetic resonance imaging (dMRI) techniques, CLGBs have been qualitatively identified as an example of superior imaging quality; however, the microstructural properties of these structures have yet to be examined. In this study, it is demonstrated for the first time that dMRI is sensitive to an organized anisotropic signal oriented in the direction parallel to the CLGBs, suggesting that dMRI could be a useful imaging method for probing the microstructure of the CLGBs. To demonstrate the anisotropic diffusion signal is coherently organized along the extent of the CLGBs and to enable a subsequent CLGB microstructural measurement, a customized tractography seeding and filtering method is proposed that utilizes the shape of the human striatum (putamen + caudate nucleus) to reconstruct the CLGBs in 3D. The proposed seeding strategy seeds tractography streamlines outward and normal to the surface of a 3D model of the striatum such that reconstructed streamlines are more likely to follow the diffusion signal peaks aligned parallel to the CLGBs. The method is applied to three different diffusion datasets, namely a high resolution 760 μm isotropic diffusion dataset acquired on a single subject, the test–retest cohort included as part of the human connectome project (N = 44) with diffusion data acquired at 1.25 mm isotropic, and a locally acquired “clinical” test–retest dataset acquired at 2.0 mm isotropic (N = 24). Reconstructed CLGBs directly overlap expected gray matter regions in the human brain for all three datasets. In addition, the method is shown to accurately reconstruct CLGBs repeatedly across multiple test–retest cohorts. The tractography CLGB reconstructions are then used to extract a quantitative measurement of microstructure from a local model of the diffusion signal along the CLGBs themselves. This is the first work to comprehensively study the CLGBs in vivo using dMRI and presents techniques suitable for future human neuroscience studies targeting these structures.

Abstract Image

通过扩散磁共振成像和束状图绘制人脑纹状体的尾状核灰质桥
在灵长类动物中,壳核和尾状核通过约1毫米厚的尾状灰质桥(caudolenticular grey matter bridge, clgb)连接,这些灰质桥散布在内囊的白质束之间。对clgb的功能和微观结构特性了解甚少。在提出高分辨率扩散磁共振成像(dMRI)技术的研究中,clgb已定性地确定为优越成像质量的一个例子;然而,这些结构的微观结构特性还有待研究。在这项研究中,首次证明了dMRI对平行于clgb方向的有组织的各向异性信号敏感,这表明dMRI可以成为探测clgb微观结构的有用成像方法。为了证明各向异性扩散信号沿着CLGB的范围是一致组织的,并使后续的CLGB微结构测量成为可能,提出了一种定制的束状图播种和滤波方法,该方法利用人类纹状体(壳核+尾状核)的形状在3D中重建CLGB。所提出的播散策略将束线成像的流线向外并垂直于纹状体的三维模型表面,这样重建的流线更有可能遵循平行于clgb的扩散信号峰。该方法应用于三个不同的扩散数据集,即单个受试者的高分辨率760 μm各向同性扩散数据集,作为人类连接组项目一部分的测试重测队列(N = 44),扩散数据采集于1.25 mm各向同性,以及本地获取的“临床”测试重测数据采集于2.0 mm各向同性(N = 24)。对于所有三个数据集,重建的clgb直接重叠了人脑中预期的灰质区域。此外,该方法被证明可以准确地在多个测试-重测试队列中重复重建clgb。然后利用束线成像CLGB重建,从CLGB本身扩散信号的局部模型中提取微观结构的定量测量。这是第一次使用dMRI全面研究体内clgb,并提出了适用于未来针对这些结构的人类神经科学研究的技术。
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来源期刊
Human Brain Mapping
Human Brain Mapping 医学-核医学
CiteScore
8.30
自引率
6.20%
发文量
401
审稿时长
3-6 weeks
期刊介绍: Human Brain Mapping publishes peer-reviewed basic, clinical, technical, and theoretical research in the interdisciplinary and rapidly expanding field of human brain mapping. The journal features research derived from non-invasive brain imaging modalities used to explore the spatial and temporal organization of the neural systems supporting human behavior. Imaging modalities of interest include positron emission tomography, event-related potentials, electro-and magnetoencephalography, magnetic resonance imaging, and single-photon emission tomography. Brain mapping research in both normal and clinical populations is encouraged. Article formats include Research Articles, Review Articles, Clinical Case Studies, and Technique, as well as Technological Developments, Theoretical Articles, and Synthetic Reviews. Technical advances, such as novel brain imaging methods, analyses for detecting or localizing neural activity, synergistic uses of multiple imaging modalities, and strategies for the design of behavioral paradigms and neural-systems modeling are of particular interest. The journal endorses the propagation of methodological standards and encourages database development in the field of human brain mapping.
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