Bias between MNI and Talairach coordinates analyzed using the ICBM‐152 brain template

Human Brain Mapping - Tập 28 Số 11 - Trang 1194-1205 - 2007
Jack L. Lancaster1, Diana Tordesillas‐Gutiérrez2, Michael J. Martinez2, Felipe S. Salinas2, Alan C. Evans3,4, Karl Zilles5, John C. Mazziotta4, Peter T. Fox5,6
1Research Imaging Center, University of Texas Health Science Center, San Antonio, Texas, USA
2University of Texas Health Science Center at San Antonio
3McGill University
4University of California at, Los Angeles
5International Consortium for Brain Mapping, UCLA, Los Angeles, California
6Research Imaging Center, University of Texas Health Science Center, San Antonio, Texas

Tóm tắt

AbstractMNI coordinates determined using SPM2 and FSL/FLIRT with the ICBM‐152 template were compared to Talairach coordinates determined using a landmark‐based Talairach registration method (TAL). Analysis revealed a clear‐cut bias in reference frames (origin, orientation) and scaling (brain size). Accordingly, ICBM‐152 fitted brains were consistently larger, oriented more nose down, and translated slightly down relative to TAL fitted brains. Whole brain analysis of MNI/Talairach coordinate disparity revealed an ellipsoidal pattern with disparity ranging from zero at a point deep within the left hemisphere to greater than 1‐cm for some anterior brain areas. MNI/Talairach coordinate disparity was generally less for brains fitted using FSL. The mni2tal transform generally reduced MNI/Talairach coordinate disparity for inferior brain areas but increased disparity for anterior, posterior, and superior areas. Coordinate disparity patterns differed for brain templates (MNI‐305, ICBM‐152) using the same fitting method (FSL/FLIRT) and for different fitting methods (SPM2, FSL/FLIRT) using the same template (ICBM‐152). An MNI‐to‐Talairach (MTT) transform to correct for bias between MNI and Talairach coordinates was formulated using a best‐fit analysis in one hundred high‐resolution 3‐D MR brain images. MTT transforms optimized for SPM2 and FSL were shown to reduced group mean MNI/Talairach coordinate disparity from a 5‐13 mm to 1‐2 mm for both deep and superficial brain sites. MTT transforms provide a validated means to convert MNI coordinates to Talairach compatible coordinates for studies using either SPM2 or FSL/FLIRT with the ICBM‐152 template. Hum Brain Mapp 2007. © 2007 Wiley‐Liss, Inc.

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