Effects of aging on 5‐HT2AR binding : a HRRT PET study with and without partial volume corrections

Abstract

Objective

We explored whether prior findings of reduction in serotonin 2A receptor (5-HT2AR) binding with age could be replicated and whether high resolution research tomography (HRRT) for positron emission tomography could compensate for partial volume effects in the presence of age-related brain atrophy, which has been a traditional concern for radioligand PET studies in the elderly. Methods

We derived 5-HT2AR nondisplaceable binding potentials (BPND) in frontal, temporal, anterior-cingulate, insula, caudate and putamen volumes of interest (VOIs) for 28 healthy subjects (mean ± SD age = 43.9 ± 17.0 years, range: 19–78 years) using HRRT. Partial volume correction (PVC) was performed in the VOI analysis. Results

The 5-HT2AR BPNDs decreased with age, a relationship best described by an exponential-decay regression. The BPNDs were found to be consistent before and after PVC, with an intra-class correlation coefficient of 0.84 and 95% confidence interval = 0.78–0.88. Conclusions

These new findings update current knowledge, in that the aging process is not always uniform across the life span and suggest that PVC may not be necessary with HRRT in healthy subjects.