[Evaluation of optimal threshold of Z score map for statistical brain image analysis].

Purpose: Aim of this study was to investigate optimal threshold of Z score when evaluating statistics image of Alzheimer's disease visually.

Method: We classified 53 clinical patients in control and target group, and evaluated the distribution of Z score calculated with statistical brain image analysis for magnetic resonance and perfusion single photon emission computed tomography (SPECT). The optimal Z score threshold was determined from statistical significance that compared previously mentioned groups.