Textural content in 3T MR: an image-based marker for Alzheimer's disease

摘要

In this paper, we propose a study, which investigates the first-order and second-order distributions of T_2 images from a magnetic resonance (MR) scan for an age-matched data set of 24 Alzheimer's disease and 17 normal patients. The study is motivated by the desire to analyze the brain iron uptake in the hippocampus of Alzheimer's patients, which is captured by low T_2 values. Since, excess iron deposition occurs locally in certain regions of the brain, we are motivated to investigate the spatial distribution of T2, which is captured by higher-order statistics. Based on the first-order and second-order distributions (involving gray level co-occurrence matrix) of T_2, we show that the second-order statistics provide features with sensitivity > 90% (at 80% specificity), which in turn capture the textural content in T_2 data. Hence, we argue that different texture characteristics of T_2 in the hippocampus for Alzheimer's and normal patients could be used as an early indicator of Alzheimer's disease.