Abstract
To observe microstructures on the X-ray cinematography by 0.6mm focal spot, usefulness of enlarged shooting was studied. As a result, even at a focus of 0.6mm, the enlarged shooting (ca. 1.7-fold) revealed the superior total M.T.F. than that of contact photography. Furthermore, Groedel effect upon magnification was as good as the grid system. In the cardiac catheterization by 0.6mm focal spot being employed most frequently at present, the enlarged shooting without using grid is a useful method. Thus, it is considered to take up this method as much as possible.
