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The main objective of this study was to propose an ensemble method based on deep learning for the early diagnosis of AD using MRI images. The methodology of this study consisted of collecting the dataset, preprocessing, creating the individual and ensemble models, evaluating the models based on ADNI data, and validating the trained model based on the local dataset. The proposed method was an ensemble approach selected through a comparative analysis of various ensemble scenarios. Finally, the six best individual CNN-based classifiers were selected to combine and constitute the ensemble model. The evaluation showed an accuracy rate of 98.57, 96.37, 94.22, 99.83, 93.88, and 93.92 for NC\/AD, NC\/EMCI, EMCI\/LMCI, LMCI\/AD, four-way and three-way classification groups, respectively. The validation results on the local dataset revealed an accuracy of 88.46 for three-way classification. Our performance results were higher than most reviewed studies and comparable with others. Although comparative analysis showed superior results of ensemble methods against individual architectures, there were no significant differences among various ensemble approaches. The validation results revealed the low performance of individual models in practice. In contrast, the ensemble method showed promising results. However, further studies on various and larger datasets are required to validate the generalizability of the model.<\/jats:p>","DOI":"10.1007\/s12021-023-09646-2","type":"journal-article","created":{"date-parts":[[2023,12,2]],"date-time":"2023-12-02T12:01:56Z","timestamp":1701518516000},"page":"89-105","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":83,"title":["A Deep Learning-Based Ensemble Method for Early Diagnosis of Alzheimer\u2019s Disease using MRI Images"],"prefix":"10.1007","volume":"22","author":[{"given":"Sina","family":"Fathi","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ali","family":"Ahmadi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Afsaneh","family":"Dehnad","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mostafa","family":"Almasi-Dooghaee","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Melika","family":"Sadegh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"name":"for the Alzheimer\u2019s Disease Neuroimaging Initiative","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2023,12,2]]},"reference":[{"key":"9646_CR1","doi-asserted-by":"publisher","first-page":"108701","DOI":"10.1016\/j.jneumeth.2020.108701","volume":"339","author":"A Abrol","year":"2020","unstructured":"Abrol, A., Bhattarai, M., Fedorov, A., Du, Y., Plis, S., & Calhoun, V. 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