An automated voxel-based method for calculating the reference value for a brain tumour metabolic index using 18F-FDG-PET and 11C-methionine PET

摘要

ObjectiveThe tumour-to-normal ratio (T/N) is a representative index reflecting brain tumour activity by ¹⁸F-fluorodeoxyglucose (FDG) and ¹¹C-methionine (MET) PET. We proposed a new automated method of calculating the normal reference value (N-value) for use as the denomination of T/N. This method uses voxel-based analysis of FDG- and MET-PET images. We compared the results of this method with those of the standard region-of-interest (ROI) method.