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目的^99Tc^m-双半胱乙酯(^99Tc^m-ECD)单光子发射型计算机断层扫描(single photon emission computed tomography,SPECT)脑血流灌注显像测定Alzheimer型痴呆(dementia of Alzheimer type,DAT)患者脑血流量(CBF)的价值。方法用NINCDS—ADRDA(national institute of neurological and communicative disorders and strokeand the