Evaluating hippocampal internal architecture on MRI: inter-rater reliability of a proposed scoring system.

•We propose a 4-point scoring system for rating clarity of hippocampal internal architecture (HIA).•The HIA scoring system has substantial inter-rater reliability among experienced reviewers.•The scoring system has moderate inter-rater reliability among non-expert reviewers.•Inter-rater reliability improved for both groups after a minimal amount of training.