T1 relaxometry of crossing fibres in the human brain.

T1 relaxometry of crossing fibres in the human brain.
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DOI:
10.1016/j.neuroimage.2016.07.037
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发表时间:
2016-11-01
期刊:
影响因子:
5.7
通讯作者:
Roebroeck A
Roebroeck A
中科院分区:
医学1区
文献类型:
--
作者:
De Santis S;Assaf Y;Jeurissen B;Jones DK;Roebroeck A

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全面的基于束的表征白色物质应包括量化髓鞘和轴突属性的能力,而不管体素内纤维组织的复杂性如何。最近,一种新的实验框架,结合反转恢复和扩散MRI,称为反转恢复扩散张量成像(IR-DTI),被引入并应用于动物研究。IR-DTI能够为体素内的每个独特纤维群分配纵向弛豫时间T1的特定值,T1是髓鞘含量的代表。在这里,我们首次将IR-DTI方法应用于7名健康受试者的体内人脑。我们证明,该方法是能够测量跨纤维区域的差异道属性,反映了不同的髓鞘化的道。我们还表明,道特定的T1具有较少的受试者间的变异性相比,传统的T1在交叉纤维的领域,这表明不同的纤维种群的特异性增加。最后,我们在模拟中表明,髓鞘形成的变化选择性地影响一个纤维束在交叉纤维区可以潜在地检测到早期使用IR-DTI。我们首次将反转恢复弥散张量成像方法应用于活体人脑。我们证明,IR-DTI可以测量跨纤维的特定T1。在交叉纤维中,与传统T1相比,IR-DTI T1具有较少的受试者间变异性。影响交叉纤维中的一个纤维的髓鞘形成的变化可以使用IR-DTI更早地检测到。
A comprehensive tract-based characterisation of white matter should include the ability to quantify myelin and axonal attributes irrespective of the complexity of fibre organisation within the voxel. Recently, a new experimental framework that combines inversion recovery and diffusion MRI, called inversion recovery diffusion tensor imaging (IR-DTI), was introduced and applied in an animal study. IR-DTI provides the ability to assign to each unique fibre population within a voxel a specific value of the longitudinal relaxation time, T1, which is a proxy for myelin content. Here, we apply the IR-DTI approach to the human brain in vivo on 7 healthy subjects for the first time. We demonstrate that the approach is able to measure differential tract properties in crossing fibre areas, reflecting the different myelination of tracts. We also show that tract-specific T1 has less inter-subject variability compared to conventional T1 in areas of crossing fibres, suggesting increased specificity to distinct fibre populations. Finally we show in simulations that changes in myelination selectively affecting one fibre bundle in crossing fibre areas can potentially be detected earlier using IR-DTI. We apply the inversion recovery DTI approach to the human brain in vivo for the first time. We demonstrate that IR-DTI can measure tract-specific T1 in crossing fibres. IR-DTI T1 has less inter-subject variability compared to conventional T1 in crossing fibres. Changes in myelination affecting one fibre in crossing fibres can be detected earlier using IR-DTI.
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