Journal of Computer Assisted Tomography. 25(3):452-457, MAY 2001
Effects of Image Orientation on the Comparability of Pediatric Brain Volumes Using Three-Dimensional MR Data
Anil Patwardhan;Stephan Eliez;Ilana Warsofsky;Gary Glover;Chris White;Jay Giedd;Bradley Peterson;Donald Rojas;Allan Reiss;
From the Stanford Psychiatry Neuroimaging Laboratory, Department of Psychiatry and Behavioral Sciences (A. J. Patwardhan, S. Eliez, I. S. Warsofsky, C. D. White, and A. L. Reiss), and Department of Radiology (G. H. Glover), Stanford University School of Medicine, Stanford, CA, Child Psychiatry Branch, National Institute of Mental Health, Bethesda, MD (J. N. Giedd), Yale Child Study Center, Yale University School of Medicine, New Haven, CT (B. S. Peterson), and Department of Psychiatry, University of Colorado Health Sciences Center, Denver, CO (D. C. Rojas), U.S.A.
PurposeThe purpose of this study was to examine the comparability of morphometric measurements made on pediatric data sets collected at five scanner locations, each using variations on a 3D spoiled gradient-recalled echo (SPGR) pulse sequence.MethodArchived MR data from 60 typically developing children were collected and separated into seven groups based on the pulse sequence used. A highly automated image-processing procedure was used to segment the brain data into white tissue, gray tissue, and CSF compartments and into various neuroanatomic regions of interest.ResultsVolumetric comparisons between groups revealed differences in areas of the temporal and occipital lobes. These differences were observed when comparing data sets with different image orientations and appeared to be due to partial volume averaging (PVA) and susceptibility-induced geometric distortions.ConclusionOur results indicate that slice selection and image resolution should be controlled in volumetric studies using aggregated data from multiple centers to minimize the effects of PVA and susceptibility-induced geometric distortions.