Patent Number: 
Section: abstract

In an X-ray image detector including an X-ray grid unit for transmitting primary X-rays and removing scattered X-rays, a fluorescent substance for emitting fluorescence through excitation by X-rays, and photoelectric conversion elements for photoelectrically converting the fluorescence, these X-ray grid unit, fluorescent substance and photoelectric conversion elements are constituted together as a single unit. The plurality of photoelectric conversion elements are arranged two-dimensionally between each adjacent two of which there is a predetermined insensitive region. The X-ray grid is composed of a plurality of X-ray absorption members for removing the scattered X-rays, and the X-ray absorption members are disposed substantially only on the predetermined insensitive regions when viewed from a direction from which X-rays are incident. Further, the fluorescent substance is disposed substantially only in the regions between the X-ray absorption members that are adjacent to each other when viewed from a direction from which X-rays are incident.