Diffusion tensor distribution imaging of an in vivo mouse brain at ultrahigh magnetic field by spatiotemporal encoding
(2020) In NMR in Biomedicine 33(11).- Abstract
Diffusion tensor distribution (DTD) imaging builds on principles from diffusion, solid-state and low-field NMR spectroscopies, to quantify the contents of heterogeneous voxels as nonparametric distributions, with tensor “size”, “shape” and orientation having direct relations to corresponding microstructural properties of biological tissues. The approach requires the acquisition of multiple images as a function of the magnitude, shape and direction of the diffusion-encoding gradients, leading to long acquisition times unless fast image read-out techniques like EPI are employed. While in previous in vivo human brain studies performed at 3 T this proved a viable option, porting these measurements to very high magnetic fields and/or to... (More)
Diffusion tensor distribution (DTD) imaging builds on principles from diffusion, solid-state and low-field NMR spectroscopies, to quantify the contents of heterogeneous voxels as nonparametric distributions, with tensor “size”, “shape” and orientation having direct relations to corresponding microstructural properties of biological tissues. The approach requires the acquisition of multiple images as a function of the magnitude, shape and direction of the diffusion-encoding gradients, leading to long acquisition times unless fast image read-out techniques like EPI are employed. While in previous in vivo human brain studies performed at 3 T this proved a viable option, porting these measurements to very high magnetic fields and/or to heterogeneous organs induces B0- and B1-inhomogeneity artifacts that challenge the limits of EPI. To overcome such challenges, we demonstrate here that high spatial resolution DTD of mouse brain can be carried out at 15.2 T with a surface-cryoprobe, by relying on SPatiotemporal ENcoding (SPEN) imaging sequences. These new acquisition and data-processing protocols are demonstrated with measurements on in vivo mouse brain, and validated with synthetic phantoms designed to mimic the diffusion properties of white matter, gray matter and cerebrospinal fluid. While still in need of full extensions to 3D mappings and of scanning additional animals to extract more general physiological conclusions, this work represents another step towards the model-free, noninvasive in vivo characterization of tissue microstructure and heterogeneity in animal models, at ≈0.1 mm resolutions.
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- author
- Yon, Maxime ; de Almeida Martins, João P. LU ; Bao, Qingjia ; Budde, Matthew D. ; Frydman, Lucio and Topgaard, Daniel LU
- organization
- publishing date
- 2020-11
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- acquisition, diffusion, diffusion MR sequences, high-order diffusion MR
- in
- NMR in Biomedicine
- volume
- 33
- issue
- 11
- article number
- e4355
- publisher
- John Wiley & Sons Inc.
- external identifiers
-
- pmid:32812669
- scopus:85089471271
- ISSN
- 0952-3480
- DOI
- 10.1002/nbm.4355
- language
- English
- LU publication?
- yes
- id
- 2d8fd4be-c2a4-4608-81db-f3b3c7909187
- date added to LUP
- 2020-08-28 11:58:47
- date last changed
- 2024-05-30 21:49:26
@article{2d8fd4be-c2a4-4608-81db-f3b3c7909187,
abstract = {{<p>Diffusion tensor distribution (DTD) imaging builds on principles from diffusion, solid-state and low-field NMR spectroscopies, to quantify the contents of heterogeneous voxels as nonparametric distributions, with tensor “size”, “shape” and orientation having direct relations to corresponding microstructural properties of biological tissues. The approach requires the acquisition of multiple images as a function of the magnitude, shape and direction of the diffusion-encoding gradients, leading to long acquisition times unless fast image read-out techniques like EPI are employed. While in previous in vivo human brain studies performed at 3 T this proved a viable option, porting these measurements to very high magnetic fields and/or to heterogeneous organs induces B<sub>0</sub>- and B<sub>1</sub>-inhomogeneity artifacts that challenge the limits of EPI. To overcome such challenges, we demonstrate here that high spatial resolution DTD of mouse brain can be carried out at 15.2 T with a surface-cryoprobe, by relying on SPatiotemporal ENcoding (SPEN) imaging sequences. These new acquisition and data-processing protocols are demonstrated with measurements on in vivo mouse brain, and validated with synthetic phantoms designed to mimic the diffusion properties of white matter, gray matter and cerebrospinal fluid. While still in need of full extensions to 3D mappings and of scanning additional animals to extract more general physiological conclusions, this work represents another step towards the model-free, noninvasive in vivo characterization of tissue microstructure and heterogeneity in animal models, at ≈0.1 mm resolutions.</p>}},
author = {{Yon, Maxime and de Almeida Martins, João P. and Bao, Qingjia and Budde, Matthew D. and Frydman, Lucio and Topgaard, Daniel}},
issn = {{0952-3480}},
keywords = {{acquisition; diffusion; diffusion MR sequences; high-order diffusion MR}},
language = {{eng}},
number = {{11}},
publisher = {{John Wiley & Sons Inc.}},
series = {{NMR in Biomedicine}},
title = {{Diffusion tensor distribution imaging of an in vivo mouse brain at ultrahigh magnetic field by spatiotemporal encoding}},
url = {{http://dx.doi.org/10.1002/nbm.4355}},
doi = {{10.1002/nbm.4355}},
volume = {{33}},
year = {{2020}},
}