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目的探讨彩色多普勒成像(color doppler flow imaging,CDFI)和经颅多普勒(transcranial doppler sonog-raphy, TCD)、 CT血管造影(computer tomographic angiography,CTA)及数字减影脑血管造影(digital subtraction angiography,DSA)在缺血性脑血管病经皮血管内支架成型术(pecutaneous transtuminal angioplasty and stenfing,PTAS