Hardstedt C, Welander U
Acta Radiol Diagn (Stockh). 1975 Nov;16(6):559-64. doi: 10.1177/028418517501600602.
The purpose of subtraction of angiographic images is to demonstrate the vessels free of superimposed, disturbing image noise. With the aid of physical film parameters the theoretic basis for an optimum subtraction technique is presented.
血管造影图像减法的目的是显示没有叠加的、干扰性图像噪声的血管。借助物理胶片参数，给出了最佳减法技术的理论基础。
