Adult Humans 23 Male adult 23 diagnostic imaging human 23 male 23 reproducibility Female 22 female 22 Reproducibility of Results 20 Young Adult 15 young adult 15 controlled study 14 Magnetic Resonance Imaging 12 Middle Aged 12 middle aged 12 nuclear magnetic resonance imaging 12 procedures 11 article 10 major clinical study 10 Article 8 anatomy and histology 8 human experiment 8 aged 6 pathology 6 physiology 6 Aged 5 functional magnetic resonance imaging 5 neuroimaging 5