Takahashi M, Ozawa Y, Takemoto H
Radiology. 1981 Jul;140(1):227-9. doi: 10.1148/radiology.140.1.7244229.
Mathematical formulas relating focal-spot separation to various geometric factors in magnification radiography are presented. Focal-spot separation is closely related to the magnification factor, focal-spot/film distance, viewing distance, and object size. When the viewing distance is equal to the focal-spot/film distance, separation is inversely proportional to magnification.
本文给出了在放大X线摄影中，焦斑间距与各种几何因素相关的数学公式。焦斑间距与放大系数、焦-片距、观察距离和物体大小密切相关。当观察距离等于焦-片距时，间距与放大率成反比。
