NDLI: Differential information content in staggered multiple shell hardi measured by the tensor distribution function

Content Provider	IEEE Xplore Digital Library
Author	Liang Zhan Leow, A.D. Aganj, I. Lenglet, C. Sapiro, G. Yacoub, E. Harel, N. Toga, A.W. Thompson, P.M.
Copyright Year	2011
Description	Author affiliation: Center for Magnetic Resonance Research, Univ. of Minnesota, Minneapolis, USA (Lenglet, C.; Yacoub, E.; Harel, N.) \|\| Laboratory of Neuro Imaging, Dept. Neurology, UCLA School of Medicine, Los Angeles, CA, USA (Liang Zhan; Toga, A.W.; Thompson, P.M.) \|\| Dept. of Electrical and Computer Engineering, Univ. of Minnesota, Minneapolis, USA (Aganj, I.; Sapiro, G.) \|\| Dept. Psychiatry, Univ. of Illinois-Chicago, USA (Leow, A.D.)
Abstract	Diffusion tensor imaging has accelerated the study of brain connectivity, but single-tensor diffusion models are too simplistic to model fiber crossing and mixing. Hybrid diffusion imaging (HYDI) samples the radial and angular structure of local diffusion on multiple spherical shells in q-space, combining the high SNR and CNR achievable at low and high b-values, respectively. We acquired and analyzed human multi-shell HARDI at ultra-high field-strength (7 Tesla; b=1000, 2000, 3000 $s/mm^{2}).$ In experiments with the tensor distribution function (TDF), the b-value affected the intrinsic uncertainty for estimating component fiber orientations and their diffusion eigenvalues. We computed orientation density functions by least-squares fitting in multiple HARDI shells simultaneously. Within the range examined, higher b-values gave improved orientation estimates but poorer eigenvalue estimates; lower b-values showed opposite strengths and weaknesses. Combining these strengths, multiple-shell HARDI, especially with staggered angular sampling, outperformed single-shell scanning protocols, even when overall scanning time was held constant.
Starting Page	305
Ending Page	309
File Size	564755
Page Count	5
File Format	PDF
ISBN	9781424441273
ISSN	19457928
DOI	10.1109/ISBI.2011.5872411
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-03-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Tensile stress Entropy Imaging Eigenvalues and eigenfunctions Image resolution Distribution functions USA Councils HARDI multi-shell ODF TDF
Content Type	Text
Resource Type	Article

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