MAPT and early-onset autosomal dominant Alzheimer disease: Hence, the first objective of this study is to propose and validate Tau-based radiomics features model for diagnosing AD/MCI patients by different cohorts (Alzheimer Disease Neuroimaging Initiative (ADNI)-Huashan hospital) and different Tau PET tracers (18F-AV1451-18F-Florzolotau).