Objective Designed a method that can automaticaly distinguish the X-ray radiological positions based on image information.Methods For any selected input clinical X-ray digital images, we extract the image outline in the edge detection method using optimal threshold selection, then process binarization. After compared with the whole body phantom X-ray images, then process gray level similarity traverse detection.Results By optimizing the decision, the best matching region of the same inputfi lm was obtained, and the imaging part of the patient is determined based on prior knowledge.Conclusion The algorithm is fast and has a high degree of robust.

Behavioral and psychological symptoms of dementia (BPSD) is a common symptom of Alzheimer's disease (AD), with an occurrence of 90%. BPSD can lead to poor prognosis and dysfunction in patients with AD, but few safe and effective treatments are available. This article overviews the occurrence frequencies of different manifestations of BPSD in AD and their changes with clinical courses of the disease, and introduces the current research progress on genetic characteristics, pathophysiological mechanism, biomarkers and therapeutics of BPSD in AD to provide references for early recognition and treatment of BPSD in AD.