PURPOSE: To provide an X-ray radiographic system which is comparatively light in weight and expensive and which can easily make a fluoroscopic image projected on a monitor square.

CONSTITUTION: X-rays transmitted through an examinee M are converted into a visible optical image by a fluorescent plate 7, and the optical image is given to a spatial optical modulation element 20 through a zoom lens 11 as a write light. The light from a light source 12 is polarized by a polarizing beam splitter 13 and given to the element 20 as a readout light. The readout light is modulated to a polarized light state change corresponding to the write light by the element 20 and outputted. The output light is detected when it passes through the splitter 13 and converted into an intensity-modulation light. The intensity- modulation light is converted into a television signal by a television image pickup tube 5, and outputted to a television monitor 6.