Methods Inf Med - Influence of parameter settings in voxel-based morphometry 8. Using DARTEL and region-of-interest on reproducibility in gray matter volumetry.

Tópicos

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Resumo

JECTIVES: To investigate whether reproducibility of gray matter volumetry is influenced by parameter settings for VBM 8 using Diffeomorphic Anatomical Registration Through Exponentiated Lie Algebra (DARTEL) with region-of-interest (ROI) analyses.METHODS: We prepared three-dimensional T1-weighted magnetic resonance images (3D-T1WIs) of 21 healthy subjects. All subjects were imaged with each of five MRI systems. Voxel-based morphometry 8 (VBM 8) and WFU PickAtlas software were used for gray matter volumetry. The bilateral ROI labels used were those provided as default settings with the software: Frontal Lobe, Hippocampus, Occipital Lobe, Orbital Gyrus, Parietal Lobe, Putamen, and Temporal Lobe. All 3D-T1WIs were segmented to gray matter with six parameters of VBM 8, with each parameter having between three and eight selectable levels. Reproducibility was evaluated as the standard deviation (mm?) of measured values for the five MRI systems.RESULTS: Reproducibility was influenced by 'Bias regularization (BiasR)', 'Bias FWHM', and 'De-noising filter' settings, but not by 'MRF weighting', 'Sampling distance', or 'Warping regularization' settings. Reproducibility in BiasR was influenced by ROI. Superior reproducibility was observed in Frontal Lobe with the BiasR1 setting, and in Hippocampus, Parietal Lobe, and Putamen with the BiasR3*, BiasR1, and BiasR5 settings, respectively.CONCLUSION: Reproducibility of gray matter volumetry was influenced by parameter settings in VBM 8 using DARTEL and ROI. In multi-center studies, the use of appropriate settings in VBM 8 with DARTEL results in reduced scanner effect.

Resumo Limpo

jectiv investig whether reproduc gray matter volumetri influenc paramet set vbm use diffeomorph anatom registr exponenti lie algebra dartel regionofinterest roi analysesmethod prepar threedimension tweight magnet reson imag dtwis healthi subject subject imag five mri system voxelbas morphometri vbm wfu pickatla softwar use gray matter volumetri bilater roi label use provid default set softwar frontal lobe hippocampus occipit lobe orbit gyrus pariet lobe putamen tempor lobe dtwis segment gray matter six paramet vbm paramet three eight select level reproduc evalu standard deviat mm measur valu five mri systemsresult reproduc influenc bias regular biasr bias fwhm denois filter set mrf weight sampl distanc warp regular set reproduc biasr influenc roi superior reproduc observ frontal lobe biasr set hippocampus pariet lobe putamen biasr biasr biasr set respectivelyconclus reproduc gray matter volumetri influenc paramet set vbm use dartel roi multicent studi use appropri set vbm dartel result reduc scanner effect

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