Quantitative examination of a novel clustering method using magnetic resonance diffusion tensor tractography.

Abstract:

:MR diffusion tensor imaging (DTI) can measure and visualize organization of white matter fibre tracts in vivo. DTI is a relatively new imaging technique, and new tools developed for quantifying fibre tracts require evaluation. The purpose of this study was to compare the reliability of a novel clustering approach with a multiple region of interest (MROI) approach in both healthy and disease (schizophrenia) populations. DTI images were acquired in 20 participants (n=10 patients with schizophrenia: 56+/-15 years; n=10 controls: 51+/-20 years) (1.5 T GE system) with diffusion gradients applied in 23 non-collinear directions, repeated three times. Whole brain seeding and creation of fibre tracts were then performed. Interrater reliability of the clustering approach, and the MROI approach, were each evaluated and the methods compared. There was high spatial (voxel-based) agreement within and between the clustering and MROI methods. Fractional anisotropy, trace, and radial and axial diffusivity values showed high intraclass correlation (p<0.001 for all tracts) for each approach. Differences in scalar indices of diffusion between the clustering and MROI approach were minimal. The excellent interrater reliability of the clustering method and high agreement with the MROI method, quantitatively and spatially, indicates that the clustering method can be used with confidence. The clustering method avoids biases of ROI drawing and placement, and, not limited by a priori predictions, may be a more robust and efficient way to identify and measure white matter tracts of interest.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Voineskos AN,O'Donnell LJ,Lobaugh NJ,Markant D,Ameis SH,Niethammer M,Mulsant BH,Pollock BG,Kennedy JL,Westin CF,Shenton ME

doi

10.1016/j.neuroimage.2008.12.028

subject

Has Abstract

pub_date

2009-04-01 00:00:00

pages

370-6

issue

2

eissn

1053-8119

issn

1095-9572

pii

S1053-8119(08)01281-0

journal_volume

45

pub_type

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