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数字减影血管造影术(Digital Subtraction Angi0graphy,DSA)是近几年发展起来的影像诊断技术。此法是将x线影像转换成二进制数构成的数字影像,并由计算机进行各种加工处理。应用这种技术能大大提高对低浓度造影剂的检测能力(可检出2%的碘浓度),并能同时获得形态和功能信息,为心脏的影像诊断提供了一种侵入性小的方法。其在心血管形态学检查方面已有比较成熟的经验,对心功能的检测在近年也备受重视,本文对此方面的近况作一介绍。 1检查方法按造影剂注入途径不同分三种。①外周静脉法:从肘静脉注入,造影剂用量40～50ml,注入速度要求10～15ml/秒以上(可同时行双例肘静脉注射,以加快注入速度),延迟3～5秒取像。②中心静脉法:从肘静脉或
Digital subtraction angiography (Digital Subtraction Angiography, DSA) is the development of image diagnostic techniques in recent years. This method is to convert x-ray images into digital images formed by binary numbers, and the computer for a variety of processing. The application of this technique greatly enhances the ability to detect low concentrations of contrast media (detectable 2% iodine) and provides both morphological and functional information, providing a less intrusive method of imaging the heart. Its cardiovascular morphology examination has more mature experience, the detection of cardiac function in recent years has also received much attention, this article on the status of an introduction. 1 inspection methods according to the different ways of injection of contrast media divided into three kinds. ① peripheral vein method: from the elbow vein injection, the amount of contrast agent 40 ~ 50ml, injection rate of 10 ~ 15ml / s or more (simultaneously double cases of elbow vein injection to speed up the infusion rate), delayed 3 to 5 seconds to take. ② central venous method: from the elbow vein or