Projects:StructuralAndDWIPipeline

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A Framework for Joint Analysis of Structural and Diffusion MRIs

Joint structural and diffusion image analysis pipeline.

Description

This framework addresses the simultaneous alignment and filtering of DWI images to correct eddy current artifacts and the subsequent alignment of those images to structural, T1 MRI to correct for susceptibility artifacts, and this paper demonstrates the importance of performing these corrections. It also shows how a T1-based, group specific atlas can be used to generate grey-matter regions of interest that can drive subsequent connectivity analyses. The result is a system that can be combined with a variety of tools for MRI analysis for tissue classification, morphometry, and cortical parcellation.

• Eddy Current Correction

We implemented the diffusion weighted image (DWI) registration model from the paper of G.K.Rohde et al. Patient head motion and eddy currents distortion cause artifacts in maps of diffusion parameters computer from DWI. This model corrects these two distortions at the same time including brightness correction.

Coronal slice from a unregisted DTI (left). The same slice after applying the registration model (right).

• "Structural Image Preprocessing"

Preprocess structural images to remove skull, correct bias field, normalize 

intensities, and segment tissue classes (to provide a white matter mask).

• "Group Atlas"

Build a structural atlas from all sub jects’ T1 images. Seed regions for tract endpoints are manually delineated in the structural atlas and then mapped from the atlas to each individual. Automatically segment white matter tracts and quantify diffusion properties using volumetric pathway analysis.

CoThe structural atlas built from the five T1 images with manually outlined frontal forceps seeds (left). The seeds mapped to each of the individual cases (right).

[1] G.K.Rohde, A.S.Barnett, P.J.Basser, S.Marenco, and C.Pierpaoli, et al., "Comprehensive Approach for Correction of Motion and Distortion in Diffusion-Weighted MRI," Magnetic Resonance in Medicine 51:103-114(2004)

Key Investigators

• Utah: Ran Tao, Tom Fletcher, Ross Whitaker