Diffusion tensor imaging of the brain: effects of distortion correction with correspondence to numbers of encoding directions

doi:10.1007/S11604-008-0262-7

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Diffusion tensor imaging of the brain: effects of distortion correction with correspondence to numbers of encoding directions

Journal Article•DOI•

Diffusion tensor imaging of the brain: effects of distortion correction with correspondence to numbers of encoding directions

Takeharu Yoshikawa¹, Shigeki Aoki¹, Osamu Abe¹, Naoto Hayashi¹, Yoshitaka Masutani¹, Tomohiko Masumoto¹, Harushi Mori¹, Yoshiroh Satake¹, Kuni Ohtomo¹ - Show less +5 more•Institutions (1)

University of Tokyo¹

31 Oct 2008-Radiation Medicine (Springer Japan)-Vol. 26, Iss: 8, pp 481-487

TL;DR: Distortion correction is effective in providing DTI of enhanced quality, notwithstanding the number of encoding directions, and visual image quality was improved after distortion correction.

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Abstract: Purpose The aim of the study was to estimate the effect of distortion correction with correspondence to numbers of encoding directions to acquire diffusion tensor imaging (DTI) of improved quality.

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Journal Article•DOI•

Diffusion tensor imaging predicts functional impairment in mild-to-moderate cervical spondylotic myelopathy

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Benjamin M. Ellingson¹, Noriko Salamon¹, John Grinstead², Langston T. Holly¹•Institutions (2)

University of California, Los Angeles¹, Siemens²

01 Nov 2014-The Spine Journal

TL;DR: The results of this study support the potential use of DTI as a biomarker for predicting functional impairment in patients with cervical spondylosis and suggest FA and ψ could identify stenosis patients with mild-to-moderate symptoms with a relatively high sensitivity and specificity.

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67 citations

Journal Article•DOI•

Visual pathway study using in vivo diffusion tensor imaging tractography to complement classic anatomy.

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Wentao Wu¹, Laura Rigolo¹, Lauren J. O'Donnell¹, Isaiah Norton¹, Sargent Shriver¹, Alexandra J. Golby¹ - Show less +2 more•Institutions (1)

Brigham and Women's Hospital¹

01 Mar 2012-Neurosurgery

TL;DR: Diffusion tensor imaging tractography provides a practical complementary method to study the OR and the Meyer loop anatomy in vivo with reference to individual 3-dimensional brain anatomy.

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Abstract: Background Knowledge of the individual course of the optic radiations (OR) is important to avoid post-operative visual deficits. Cadaveric studies of the visual pathways are limited because it has not been possible to accurately separate the OR from neighboring tracts and results may not apply to individual patients. Diffusion tensor imaging (DTI) studies may be able to demonstrate the relationships between the OR and neighboring fibers in vivo in individual subjects.

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46 citations

Cites background or methods from "Diffusion tensor imaging of the bra..."

...Distortion of the FA map is related to unfavorable effects of eddy currents.(22) Diffusion tensor images were obtained with echo planar imaging, which was highly sensitive to eddy currents....
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...Then, nonlinear transformations such as interslice space resizing of FA maps were manually modified in Slicer to compensate for nonlinear deformations inherent in diffusion MRI data.(22) Anatomic precision of the registration was then reviewed by visual analysis of merged images and iterative test-re-test with the use of several landmarks....
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...The calculation of the diffusion tensors could be impractical if different volumes of the series were distorted relative to each other and finally resulted in distortion of the FA maps.(22) The distortion of the FA maps leads to misregistration of the FA maps relative to the T1weighted images....
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Journal Article•DOI•

Prediction of Neurological Impairment in Cervical Spondylotic Myelopathy using a Combination of Diffusion MRI and Proton MR Spectroscopy

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Benjamin M. Ellingson¹, Noriko Salamon¹, Anthony J. Hardy¹, Langston T. Holly¹•Institutions (1)

University of California, Los Angeles¹

02 Oct 2015-PLOS ONE

TL;DR: A linear combination of DTI and MRS measurements within the cervical spinal cord may be useful for accurately predicting neurological deficits in patients with cervical spondylosis.

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Abstract: Purpose In the present study we investigated a combination of diffusion tensor imaging (DTI) and magnetic resonance spectroscopic (MRS) biomarkers in order to predict neurological impairment in patients with cervical spondylosis.

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43 citations

Cites background from "Diffusion tensor imaging of the bra..."

...Although previous spinal cord DTI studies have suggested that white matter integrity assessment in the spinal cord may not require a full tensor [44], DTI studies in the brain have shown increased accuracy of the tensor with increasing diffusion directions [45, 46]....
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Journal Article•DOI•

Optimization of the parameters for diffusion tensor magnetic resonance imaging data acquisition for breast fiber tractography at 1.5 T.

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Yuan Wang¹, Xiao-Peng Zhang¹, Yan-Ling Li¹, Xiao-Ting Li¹, Yan Hu¹, Yong Cui¹, Ying-Shi Sun¹, Xiao-Yan Zhang¹ - Show less +4 more•Institutions (1)

Peking University¹

01 Feb 2014-Clinical Breast Cancer

TL;DR: The optimization of data acquisition parameters could improve the quality of breast DT-MRI images and assist fiber tractography at 1.5 T.

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16 citations

Cites background from "Diffusion tensor imaging of the bra..."

...It is known that more directions help obtain detailed and precise information for fiber tracking.(21,22) However, more directions have the disadvantages of requiring longer time, which might increase the danger of motion artifacts ruining the DTI image quality....
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Journal Article•DOI•

Diffusion tensor tractography of the uncinate fasciculus: Pitfalls in quantitative analysis due to traumatic volume changes

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Timo Kurki, Jussi P. Laalo¹, Olli M. Oksaranta•Institutions (1)

University of Turku¹

01 Jul 2013-Journal of Magnetic Resonance Imaging

TL;DR: To demonstrate the sensitivity of quantitative diffusion tensor tractography to traumatic injury of the uncinate fasciculus, and to evaluate the effect of volume changes on the accuracy of quantitative analysis.

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Abstract: Purpose To demonstrate the sensitivity of quantitative diffusion tensor tractography to traumatic injury of the uncinate fasciculus (UF), and to evaluate the effect of volume changes on the accuracy of quantitative analysis Materials and Methods Diffusion tensor imaging (DTI) was performed at 3 T for 110 patients with traumatic brain injury (TBI) and 60 control subjects Volume, mean diffusivity (MD), and mean fractional anisotropy (FA) of the UF were measured by means of tractography The influence of FA threshold on mean FA values was determined and the values were further related to the tract volume Results In patients with TBI, 16% of the volumes and 29% of the FA values were decreased and 25% of the MD values were increased (>2 SD from the mean of controls) Small tracts (6% of trajectories) often had normal mean FA, but low volume-related FA values Large UFs often had decreased mean FA values, but normal volume-related central values (3% of trajectories) Conclusion Posttraumatic FA and MD changes and volume reductions are common in the tractography of UF Trauma-induced volume changes can cause misleading whole-tract mean FA values Therefore, additional volume-based analysis of the central part is beneficial for clinical assessment J Magn Reson Imaging 2013;38:46–53 © 2012 Wiley Periodicals, Inc

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15 citations

Cites methods from "Diffusion tensor imaging of the bra..."

...The introduction of 3 T MRI and parallel imaging (28–30) with an improved signal-to-noise ratio, allowing the reduction of voxel size and diffusion registration methods for the correction of susceptibility-induced shear and eddy current distortions as well as patient motion (30,31), has markedly improved the technique and advanced the clinical prospects....
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References

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Journal Article•DOI•

MR diffusion tensor spectroscopy and imaging.

[...]

Peter J. Basser¹, J. Mattiello¹, D. Lebihan¹•Institutions (1)

National Center for Research Resources¹

01 Jan 1994-Biophysical Journal

TL;DR: Once Deff is estimated from a series of NMR pulsed-gradient, spin-echo experiments, a tissue's three orthotropic axes can be determined and the effective diffusivities along these orthotropic directions are the eigenvalues of Deff.

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5,641 citations

"Diffusion tensor imaging of the bra..." refers methods in this paper

...The diffusion tensor has been introduced to describe both the direction and magnitude of diffusion, and a recent magnetic resonance imaging (MRI) technique allows in vivo measurement of the diffusion tensor in cerebral, cardiac, and other tissues.(2,3)...
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Journal Article•DOI•

Estimation of the Effective Self-Diffusion Tensor from the NMR Spin Echo

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Peter J. Basser¹, J. Mattiello, D. Lebihan•Institutions (1)

National Institutes of Health¹

01 Mar 1994-Journal of Magnetic Resonance, Series B

TL;DR: The diagonal and off-diagonal elements of the effective self-diffusion tensor, Deff, are related to the echo intensity in an NMR spin-echo experiment.

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3,645 citations

Diffusion Tensor MR Imaging ofthe Human Brain

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Carlo Pierpaoli, Peter Jezzard, Peter J. Basser, Alan S. Barnett

01 Jan 1996

TL;DR: A quantitative characterization of water diffusion in anisotropic, heterogeneously oriented tissues is clinically feasible and should improve the neuroradiologic assessment of a variety of gray and white matter disorders.

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Abstract: PURPOSE To assess intrinsic properties of water diffusion in normal human brain by using quantitative parameters derived from the diffusion tensor, D, which are insensitive to patient orientation. MATERIALS AND METHODS Maps of the principal diffusivities of D, of Trace(D), and of diffusion anisotropy indices were calculated in eight healthy adults from 31 multisection, interleaved echo-planar diffusion-weighted images acquired in about 25 minutes. RESULTS No statistically significant differences in Trace(D) (approximately 2,100 x 10(-6) mm2/sec) were found within normal brain parenchyma, except in the cortex, where Trace(D) was higher. Diffusion anisotropy varied widely among different white matter regions, reflecting differences in fiber-tract architecture. In the corpus callosum and pyramidal tracts, the ratio of parallel to perpendicular diffusivities was approximately threefold higher than previously reported, and diffusion appeared cylindrically symmetric. However, in other white matter regions, particularly in the centrum semiovale, diffusion anisotropy was low, and cylindrical symmetry was not observed. Maps of parameters derived from D were also used to segment tissues based on their diffusion properties. CONCLUSION A quantitative characterization of water diffusion in anisotropic, heterogeneously oriented tissues is clinically feasible. This should improve the neuroradiologic assessment of a variety of gray and white matter disorders.

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2,377 citations

"Diffusion tensor imaging of the bra..." refers methods in this paper

...We employed the “dual gradient” scheme because it is not only a conventional scheme but is one of the most frequently used methods to perform DTI for research and in the clinical setting.(4,5) Our results support the fi nding that the “dual gradient” scheme is suboptimal for DTI but indicate that an attempt to correct distortion is better than nothing in the clinical settings where only the “dual gradient” scheme is available for DTI....
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Journal Article•DOI•

Diffusion tensor MR imaging of the human brain.

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Carlo Pierpaoli¹, Peter Jezzard, Peter J. Basser, Alan S. Barnett, G. Di Chiro - Show less +1 more•Institutions (1)

National Institutes of Health¹

01 Dec 1996-Radiology

TL;DR: In this paper, the intrinsic properties of water diffusion in normal human brain were assessed by using quantitative parameters derived from the diffusion tensor, D, which are insensitive to patient orientation and showed that diffusion appeared cylindrically symmetric.

...read moreread less

Abstract: PURPOSE: To assess intrinsic properties of water diffusion in normal human brain by using quantitative parameters derived from the diffusion tensor, D, which are insensitive to patient orientation. MATERIALS AND METHODS: Maps of the principal diffusivities of D, of Trace(D), and of diffusion anisotropy indices were calculated in eight healthy adults from 31 multisection, interleaved echo-planar diffusion-weighted images acquired in about 25 minutes. RESULTS: No statistically significant differences in Trace(D) (approximately 2,100 x 10(-6) mm2/sec) were found within normal brain parenchyma, except in the cortex, where Trace(D) was higher. Diffusion anisotropy varied widely among different white matter regions, reflecting differences in fiber-tract architecture. In the corpus callosum and pyramidal tracts, the ratio of parallel to perpendicular diffusivities was approximately threefold higher than previously reported, and diffusion appeared cylindrically symmetric. However, in other white matter regions, p...

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2,374 citations

Journal Article•DOI•

Optimal strategies for measuring diffusion in anisotropic systems by magnetic resonance imaging.

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Derek K. Jones¹, Mark A. Horsfield¹, Andrew Simmons²•Institutions (2)

Leicester Royal Infirmary¹, King's College²

01 Sep 1999

TL;DR: An algorithm is presented that minimizes the bias inherent in making measurements with a fixed set of gradient vector directions by spreading out measurements in 3‐dimensional gradient vector space and this results in reduced scan times, increased precision, or improved resolution in diffusion tensor images.

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Abstract: The optimization of acquisition parameters for precise measurement of diffusion in anisotropic systems is described. First, an algorithm is presented that minimizes the bias inherent in making measurements with a fixed set of gradient vector directions by spreading out measurements in 3-dimensional gradient vector space. Next, it is shown how the set of b—matrices and echo time can be optimized for estimating the diffusion tensor and its scalar invariants. The standard deviation in the estimate of the tensor trace in a water phantom was reduced by more than 40% and the artefactual anisotropy was reduced by more than 60% when using the optimized scheme compared with a more conventional scheme for the same scan time, and marked improvements are demonstrated in the human brain with the optimized sequences. Use of these optimal schemes results in reduced scan times, increased precision, or improved resolution in diffusion tensor images. Magn Reson Med 42:515‐ 525, 1999. r 1999 Wiley-Liss, Inc.

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1,564 citations