Before revision:  We use ground-truth longitudinal data from ADNI to evaluate the quality  of synthesised images . A pre-trained age predictor , which estimates the apparent age of a brain image, is used to assess age accuracy.
After revision:  We use ground-truth longitudinal data from ADNI to evaluate the quality of synthesised images using ground-truth longitudinal data and a pre-trained age predictor , which estimates the apparent age of a brain image, is used to assess age accuracy.