Three-dimensional stereotactic surface projection in the statistical analysis of single photon emission computed tomography data for distinguishing between Alzheimer’s disease and depression

Figure 4 Schematic representation of the classification system. Types (2 × 2 = 4 types) were determined based on the AD rating (positive/negative) and on the MMSE findings (positive/negative). Data from individual patients are plotted by type (A, B, C, and D) on the graph. The X-axis indicates the AD-associated region Z-scores and the Y-axis indicates the MMSE scores. A: True AD; B: Pseud dementia; C: Occult AD; D: True depression. MMSE: Minimal Mental State Examination; AD: Alzheimer’s disease.