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Towards higher sensitivity and stability of axon diameter estimation with diffusion-weighted MRI

文献类型：期刊论文

作者Sepehrband, Farshid1,2; Alexander, Daniel C.3; Kurniawan, Nyoman D.1; Reutens, David C.1,4; Yang, Zhengyi1,5,6,7
刊名NMR IN BIOMEDICINE
出版日期2016-03-01
卷号29期号:3页码:293-308
关键词Diffusion-weighted Mri Activeax Ultra-high Gradient Strength Axon Diameter Index Histological Validation Electron Microscopy Mouse Corpus Callosum
DOI10.1002/nbm.3462
文献子类Article
英文摘要Diffusion-weighted MRI is an important tool for in vivo and non-invasive axon morphometry. The ActiveAx technique utilises an optimised acquisition protocol to infer orientationally invariant indices of axon diameter and density by fitting a model of white matter to the acquired data. In this study, we investigated the factors that influence the sensitivity to small-diameter axons, namely the gradient strength of the acquisition protocol and the model fitting routine. Diffusion-weighted ex. vivo images of the mouse brain were acquired using 16.4-T MRI with high (G(max) of 300 mT/m) and ultra-high (G(max) of 1350 mT/m) gradient strength acquisitions. The estimated axon diameter indices of the mid-sagittal corpus callosum were validated using electron microscopy. In addition, a dictionary-based fitting routine was employed and evaluated. Axon diameter indices were closer to electron microscopy measures when higher gradient strengths were employed. Despite the improvement, estimated axon diameter indices (a lower bound of similar to 1.8m) remained higher than the measurements obtained using electron microscopy (similar to 1.2m). We further observed that limitations of pulsed gradient spin echo (PGSE) acquisition sequences and axonal dispersion could also influence the sensitivity with which axon diameter indices could be estimated. Our results highlight the influence of acquisition protocol, tissue model and model fitting, in addition to gradient strength, on advanced microstructural diffusion-weighted imaging techniques. (c) 2016 The Authors. NMR in Biomedicine published by John Wiley & Sons Ltd.
WOS关键词COMPARTMENT MODELS ; CORPUS-CALLOSUM ; WHITE-MATTER ; SPIN-ECHO ; RESTRICTED DIFFUSION ; SELF-DIFFUSION ; MOUSE-BRAIN ; 300 MT/M ; MICROSTRUCTURE ; NMR
WOS研究方向Biophysics ; Radiology, Nuclear Medicine & Medical Imaging ; Spectroscopy
语种英语
WOS记录号WOS:000371426000010
资助机构University of Queensland Centennial (UQCent) ; International Postgraduate Research Scholarship (IPRS) ; National Health and Medical Research Council of Australia(628952) ; EPSRC(G007748 I027084 L022680 ; M020533)
源URL[http://ir.ia.ac.cn/handle/173211/11362]  
专题自动化研究所_脑网络组研究中心
作者单位1.Univ Queensland, Ctr Adv Imaging, Brisbane, Qld 4072, Australia
2.Univ Queensland, Queensland Brain Inst, Brisbane, Qld, Australia
3.UCL, Dept Comp Sci, London, England
4.UCL, Ctr Med Image Comp, London, England
5.Univ Queensland, Sch Informat Technol & Elect Engn, Brisbane, Qld, Australia
6.Chinese Acad Sci, Brainnetome Ctr, Inst Automat, Beijing, Peoples R China
7.Southwest Univ Sci & Technol, Fac Informat Engn, Mianyang, Peoples R China
推荐引用方式
GB/T 7714		 Sepehrband, Farshid,Alexander, Daniel C.,Kurniawan, Nyoman D.,et al. Towards higher sensitivity and stability of axon diameter estimation with diffusion-weighted MRI[J]. NMR IN BIOMEDICINE,2016,29(3):293-308.
APA Sepehrband, Farshid,Alexander, Daniel C.,Kurniawan, Nyoman D.,Reutens, David C.,&Yang, Zhengyi.(2016).Towards higher sensitivity and stability of axon diameter estimation with diffusion-weighted MRI.NMR IN BIOMEDICINE,29(3),293-308.
MLA Sepehrband, Farshid,et al."Towards higher sensitivity and stability of axon diameter estimation with diffusion-weighted MRI".NMR IN BIOMEDICINE 29.3(2016):293-308.

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