PURPOSE: To fully understand the effects of an image processing methodology on the comparisons of regional patterns of brain perfusion over time and between subject groups. MATERIALS AND METHODS: Two brain normalization methods were compared using images of elderly controls and subjects with MCI and AD: the normalization package of statistical parametric mapping (SPM2), and a fully deformable model (FDM). The performance of these two normalization methods was quantitatively evaluated based on two criteria: (a) the alignment accuracy of five brain structures to the colin27 reference volume, and (b) impact of spatial normalization methods on the sensitivity of perfusion magnetic resonance imaging (pMRI). RESULTS: The delineations of all five brain structures had significantly higher overlap with expert manual tracings using FDM compared to SPM (two-tailed, P < 0.025). When applied to the biostatistical analysis of CBF maps, a larger number of statistically significant voxels was identified from FDM compared with SPM2 regardless of the effects of the threshold and smoothing kernel. CONCLUSION: The greater degree of deformation freedom associated with FDM may yield more accurate region matching and higher statistical sensitivity in identifying regions of CBF differences between elderly groups with prevalent late-life neurodegenerative conditions. (c) 2008 Wiley-Liss, Inc.
PURPOSE: To fully understand the effects of an image processing methodology on the comparisons of regional patterns of brain perfusion over time and between subject groups. MATERIALS AND METHODS: Two brain normalization methods were compared using images of elderly controls and subjects with MCI and AD: the normalization package of statistical parametric mapping (SPM2), and a fully deformable model (FDM). The performance of these two normalization methods was quantitatively evaluated based on two criteria: (a) the alignment accuracy of five brain structures to the colin27 reference volume, and (b) impact of spatial normalization methods on the sensitivity of perfusion magnetic resonance imaging (pMRI). RESULTS: The delineations of all five brain structures had significantly higher overlap with expert manual tracings using FDM compared to SPM (two-tailed, P < 0.025). When applied to the biostatistical analysis of CBF maps, a larger number of statistically significant voxels was identified from FDM compared with SPM2 regardless of the effects of the threshold and smoothing kernel. CONCLUSION: The greater degree of deformation freedom associated with FDM may yield more accurate region matching and higher statistical sensitivity in identifying regions of CBF differences between elderly groups with prevalent late-life neurodegenerative conditions. (c) 2008 Wiley-Liss, Inc.
Authors: Fabrice Crivello; Thorsten Schormann; Nathalie Tzourio-Mazoyer; Per E Roland; Karl Zilles; Bernard M Mazoyer Journal: Hum Brain Mapp Date: 2002-08 Impact factor: 5.038
Authors: Oscar L Lopez; William J Jagust; Steven T DeKosky; James T Becker; Annette Fitzpatrick; Corinne Dulberg; John Breitner; Constantine Lyketsos; Beverly Jones; Claudia Kawas; Michelle Carlson; Lewis H Kuller Journal: Arch Neurol Date: 2003-10
Authors: Weiying Dai; Oscar L Lopez; Owen T Carmichael; James T Becker; Lewis H Kuller; H Michael Gach Journal: Radiology Date: 2009-01-21 Impact factor: 11.105