. "To prevent this, a grid comprising an array of blades made of a material such as lead that does not transmit X-rays is placed in front of the solid-state imaging device 4 within the X-ray sensor 3, whereby only X-rays that are to properly impinge upon this position are made to impinge upon the solid-state imaging device 4, with the scattered X-rays being shielded from the solid-state imaging devic" . . .