Towards higher sensitivity and stability of axon diameter estimation with diffusion-weighted MRI | |
Sepehrband, Farshid1,2; Alexander, Daniel C.3; Kurniawan, Nyoman D.1; Reutens, David C.1,4; Yang, Zhengyi1,5,6,7 | |
发表期刊 | NMR IN BIOMEDICINE |
2016-03-01 | |
卷号 | 29期号:3页码:293-308 |
文章类型 | Article |
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. |
关键词 | Diffusion-weighted Mri Activeax Ultra-high Gradient Strength Axon Diameter Index Histological Validation Electron Microscopy Mouse Corpus Callosum |
WOS标题词 | Science & Technology ; Life Sciences & Biomedicine ; Technology |
DOI | 10.1002/nbm.3462 |
关键词[WOS] | COMPARTMENT MODELS ; CORPUS-CALLOSUM ; WHITE-MATTER ; SPIN-ECHO ; RESTRICTED DIFFUSION ; SELF-DIFFUSION ; MOUSE-BRAIN ; 300 MT/M ; MICROSTRUCTURE ; NMR |
收录类别 | SCI |
语种 | 英语 |
项目资助者 | University of Queensland Centennial (UQCent) ; International Postgraduate Research Scholarship (IPRS) ; National Health and Medical Research Council of Australia(628952) ; EPSRC(G007748 I027084 L022680 ; M020533) |
WOS研究方向 | Biophysics ; Radiology, Nuclear Medicine & Medical Imaging ; Spectroscopy |
WOS类目 | Biophysics ; Radiology, Nuclear Medicine & Medical Imaging ; Spectroscopy |
WOS记录号 | WOS:000371426000010 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.ia.ac.cn/handle/173211/11362 |
专题 | 脑图谱与类脑智能实验室_脑网络组研究 |
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. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论