Brant-Zawadzki M, Gould R, Norman D, Newton T H, Lane B
AJR Am J Roentgenol. 1983 Feb;140(2):347-53. doi: 10.2214/ajr.140.2.347.
For 4 months, a prototype digital subtraction system was used to obtain images of the cerebral vasculature after intraarterial contrast injections. In 12 instances, the intraarterial injections were recorded with both a digital subtraction unit and conventional direct magnification film-screen system. The digital subtraction and conventional film subtraction images were compared and graded for quality and information content by three skilled observers. In addition, quantitative measurements of contrast-detail performance and spatial resolution were obtained on both the digital system and the screen-film imaging chain. In a clinical setting, both the digital subtraction and conventional film-screen systems provided similar quality images and angiographic information. Contrast-detail curves demonstrated that digital subtraction angiography outperformed conventional film technique for low-contrast objects. Digital subtraction angiography also reduced the time required to obtain the angiogram, markedly reduced film cost, and lowered the contrast agent burden.
在4个月的时间里，使用了一个原型数字减法系统来获取动脉内注射造影剂后脑血管的图像。在12个病例中，动脉内注射同时用数字减法装置和传统的直接放大胶片-增感屏系统进行记录。由三名技术熟练的观察者对数字减法图像和传统胶片减法图像的质量和信息含量进行比较和分级。此外，还对数字系统和屏-片成像链进行了对比度-细节性能和空间分辨率的定量测量。在临床环境中，数字减法系统和传统胶片-屏系统提供的图像质量和血管造影信息相似。对比度-细节曲线表明，对于低对比度物体，数字减法血管造影优于传统胶片技术。数字减法血管造影还减少了获取血管造影片所需的时间，显著降低了胶片成本，并减轻了造影剂负担。
