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Author:
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Year:
Volume:
Issue:
shu zi jian ying xue guan zao ying shu
Author(s):
JIN Baorong
Pages:
6
-
8
Year:
1990
Issue:
1
Journal:
Chinese Journal of Medical Physics
Keyword:
血管造影术
;
影像增强
;
电视技术
;
计算技术
;
射线能量
;
微细血管
;
造影剂
;
静脉畸形
;
线性减弱系数
;
肾动脉造影
;
Abstract:
<正> 数字减影血管造影术(Digital Subtraction,Anroggraphy简称DSA)是七十年代后期开始迅速发展的一种新的成象技术。它是计算技术、电视技术和影像增强技术相结合的产物。由于它的出现,克服了血管造影术的困难,使血管造影术大大前进了一步。 DSA可粗分为两类:时间型减影和能量型减影。时间型减影以时间作为参量,能有效地消除造影血管或器官上下复盖组织(包括软组织和骨骼)的影响,但对病人的运动很敏感。能量型减影以射线能量作为参数,可以抑制由于
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