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01-10-2014 | Original Article

Evaluation of Two Automated Methods for PET Region of Interest Analysis

Authors: Martin Schain, Katarina Varnäs, Zsolt Cselényi, Christer Halldin, Lars Farde, Andrea Varrone

Published in: Neuroinformatics | Issue 4/2014

Abstract

Manual definition of regions of interest (ROIs) has been considered the reference standard method in PET data evaluation. The method is labor-intensive, prone to rater bias and may show low reproducibility. Automated template-based methods for ROI definition may overcome these limitations. The aim of this study was to validate the two automated methods FreeSurfer and the AAL template for definition of ROIs for the PET data analysis. PET data obtained using the radioligands [¹¹C]AZD2184 (amyloid-β radioligand) and [¹¹C]AZ10419369 (5-HT_1B receptor radioligand) were evaluated. PET measurements acquired on one high and one lower resolution PET system were included. Outcome measures obtained using automated methods were compared to those obtained using manual ROIs, using linear regression analysis, intraclass correlation coefficients, and repeated measures ANOVA. ROIs provided by the automatic methods were larger than the manually delineated regions, which in some cases introduced biased estimates of the outcome measures. However, with the exception of the caudate, both AAL and FreeSurfer generally provided outcome measures that were in good agreement to those obtained from manually delineated ROIs, as long as the manually defined cerebellum was used as a reference region. Both AAL and FreeSurfer can be used for quantification of PET data, with similar accuracy in the estimates of outcome measures. Thus, the choice of method could be based upon necessity of fast analysis as provided by AAL, or more detailed ROIs and measures of cortical thickness as provided by FreeSurfer.

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Title: Evaluation of Two Automated Methods for PET Region of Interest Analysis
Authors: Martin Schain
Katarina Varnäs
Zsolt Cselényi
Christer Halldin
Lars Farde
Andrea Varrone
Publication date: 01-10-2014
Publisher: Springer US
Published in: Neuroinformatics / Issue 4/2014
Print ISSN: 1539-2791
Electronic ISSN: 1559-0089
DOI: https://doi.org/10.1007/s12021-014-9233-6

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Evaluation of Two Automated Methods for PET Region of Interest Analysis

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