Imaging breakthroughs in dementia: Pioneering 3D T1-weighted MPRAGE vs. routine spin echo with a focus on Alzheimer's disease
Authors:   Department of Radiology, Saveetha Medical College and Hospital, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, Tamil Nadu, India, Pandian Vinoth , Sharmeela S. ,   Department of Radiology, Saveetha Medical College and Hospital, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, Tamil Nadu, India, Nivashini G.R. ,   Department of Radiology, Saveetha Medical College and Hospital, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, Tamil Nadu, India, Ramakrishnan Karthik Krishna ,   Department of Radiology, Saveetha Medical College and Hospital, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, Tamil Nadu, India, Thangarajah Arunthathy ,   Department of Radiology, Saveetha Medical College and Hospital, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, Tamil Nadu, India
Published: December 2024

Background. Dementia, a spectrum of neurocognitive disorders, leads to progressive cognitive and functional decline, primarily affecting memory and executive functions. Among the most common causes is Alzheimer's disease (AD), which accounts for 60-80% of dementia cases. Neuroimaging, particularly Magnetic Resonance Imaging (MRI), plays a critical role in diagnosing dementia, helping differentiate between various subtypes such as Alzheimer's disease, vascular dementia (VaD), frontotemporal dementia (FTD), and Lewy body dementia (LBD). This study explores the utility of 3D T1-weighted Magnetization Prepared Rapid Gradient Echo (MPRAGE) and conventional spin echo sequences in distinguishing dementia subtypes, with a focus on Alzheimer's disease. Methods. This cross-sectional study included 40 elderly subjects diagnosed with cognitive impairment or dementia. Participants were assessed using 3D T1 MPRAGE sequences to calculate Medial Temporal Lobe Atrophy (MTA) indices and Entorhinal Cortex and Related Areas (ERICA) scores, alongside conventional spin echo sequences. MRI served as the primary imaging modality to differentiate between Alzheimer's disease, vascular dementia, and other dementia subtypes. Statistical analyses included descriptive statistics, inferential tests, and Receiver Operating Characteristic (ROC) curves to evaluate diagnostic accuracy. Results. The average MTA score for Alzheimer's disease was 3.33, significantly higher than that for vascular dementia (2.73), frontotemporal dementia (2.33), and Lewy body dementia (0.6). The mean ERICA score for Alzheimer's disease was 3.0, higher than FTD (0.83), VaD (0.55), and LBD (0.0). Lewy body dementia exhibited significantly larger hippocampal volumes than other dementia subtypes. The ROC curve for MTA in predicting Alzheimer's disease yielded an area under the curve (AUC) of 0.833, with a sensitivity of 98.7% and an overall diagnostic accuracy of 80%. The ERICA score achieved an AUC of 1.0, demonstrating perfect diagnostic accuracy for Alzheimer's disease. Conclusion. The study underscores the superior diagnostic accuracy of 3D T1 MPRAGE in calculating MTA and ERICA scores, enhancing early detection and differentiation of Alzheimer's disease from other dementia subtypes. The integration of these advanced imaging techniques provides a powerful diagnostic tool, ensuring more reliable and early diagnosis in clinical practice. This research highlights the potential of 3D T1 MPRAGE in revolutionizing dementia diagnostics, paving the way for improved patient outcomes.