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DSA(digital subtraction angiography)
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解析：DSA(digital subtraction angiography)：数字减影血管造影，是应用计算机处理数字化影像信息技术，以消除骨骼和软组织影像，突出显示血管影像。分为动脉法和静脉法DSA两种，前者血管显影较清晰，对比剂用量减少，但需行动脉内导管术，患者有一定的痛苦。
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