  The most frequent kind of dementia of the nervous system, Alzheimer's
disease, weakens several brain processes (such as memory) and eventually
results in death. The clinical study uses magnetic resonance imaging to
diagnose AD. Deep learning algorithms are capable of pattern recognition and
feature extraction from the inputted raw data. As early diagnosis and stage
detection are the most crucial elements in enhancing patient care and treatment
outcomes, deep learning algorithms for MRI images have recently allowed for
diagnosing a medical condition at the beginning stage and identifying
particular symptoms of Alzheimer's disease. As a result, we aimed to analyze
five specific studies focused on AD diagnosis using MRI-based deep learning
algorithms between 2021 and 2023 in this study. To completely illustrate the
differences between these techniques and comprehend how deep learning
algorithms function, we attempted to explore selected approaches in depth.
