Correction of eddy-current distortions in diffusion tensor images using the known directions and strengths of diffusion gradients.

Correction of eddy-current distortions in diffusion tensor images using the known directions and strengths of diffusion gradients. Research Abstract Details 

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Correction of eddy-current distortions in diffusion tensor images using the known directions and strengths of diffusion gradients. Abstract Text:

Jiancheng Zhuang,Jan Hrabe,Alayar Kangarlu,Dongrong Xu,Ravi Bansal,Craig A Branch,Bradley S Peterson,Jiancheng Zhuang,Jan Hrabe,Alayar Kangarlu,Dongrong Xu,Ravi Bansal,Craig A Branch,Bradley S Peterson,

PURPOSE: To correct eddy-current artifacts in diffusion tensor (DT) images without the need to obtain auxiliary scans for the sole purpose of correction. MATERIALS AND METHODS: DT images are susceptible to distortions caused by eddy currents induced by large diffusion gradients. We propose a new postacquisition correction algorithm that does not require any auxiliary reference scans. It also avoids the problematic procedure of cross-correlating images with significantly different contrasts. A linear model is used to describe the dependence of distortion parameters (translation, scaling, and shear) on the diffusion gradients. The model is solved numerically to provide an individual correction for every diffusion-weighted (DW) image. RESULTS: The assumptions of the linear model were successfully verified in a series of experiments on a silicon oil phantom. The correction obtained for this phantom was compared with correction obtained by a previously published method. The algorithm was then shown to markedly reduce eddy-current distortions in DT images from human subjects. CONCLUSION: The proposed algorithm can accurately correct eddy-current artifacts in DT images. Its principal advantages are that only images with comparable signals and contrasts are cross-correlated, and no additional scans are required.

Correction of eddy-current distortions in diffusion tensor images using the known directions and strengths of diffusion gradients. Publishing Authors By Initials

J Zhuang,J Hrabe,A Kangarlu,D Xu,R Bansal,CA Branch,BS Peterson,J Zhuang,J Hrabe,A Kangarlu,D Xu,R Bansal,CA Branch,BS Peterson,

For similar investigative techniques: epidemiologic methods: statistics as topic: sensitivity and specificity research abstracts see: investigative techniques: epidemiologic methods: statistics as topic: sensitivity and specificity research

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Correction of eddy-current distortions in diffusion tensor images using the known directions and strengths of diffusion gradients. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of magnetic resonance imaging : JMRI

VOLUME: 24

Page Numbers: 1188-93

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ISSN: 1053-1807

DAY: 3

MONTH: Nov

YEAR: 2006

Correction of eddy-current distortions in diffusion tensor images using the known directions and strengths of diffusion gradients. Information

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LANGUAGE: eng

NlmUniqueID: 9105850

Correction of eddy-current distortions in diffusion tensor images using the known directions and strengths of diffusion gradients. Keywords Mesh Terms:

KEYWORDS: Sensitivity and Specificity

MESH TERMS: methods

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Grant and Affiliation Information for Correction of eddy-current distortions in diffusion tensor images using the known directions and strengths of diffusion gradients.

AFFILIATION: Magnetic Resonance Imaging Unit, Department of Psychiatry, Columbia College of Physicians and Surgeons, New York, New York, USA. jc.zhuang@gmail.com

Country: United States

AGENCY: United States NIMH

GRANT: MH74677

ACRONYM: MH

MEDLINETA: J Magn Reson Imaging

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