Patent ID: 7103141

Claim:
A scan type digital X-ray imaging apparatus comprising an X-ray generator for emitting X-ray slit beams, an X-ray detector for detecting X-ray transmitted through an abject to be examined, and an object fixing means disposed between the X-ray generator and the X-ray detector, for holding the object in an appropriate position for X-ray photography, in which X-ray beam scanning is performed in a manner that the X-ray slit beam is emitted from said X-ray generator for said object and is received on said X-ray detector, with said X-ray generator still relative to said object, while said X-ray slit beam and said X-ray detector are synchronously moved in the same direction with said object interposed therebetween, thereby producing an X-ray image of the object, and wherein a scanning speed of said X-ray slit beam is feedback controlled such that an X-ray transmitted amount of said X-ray slit beams through said object detected by said X-ray detector provides an appropriate photographic density for both a soft tissue and a hard tissue region in said object, depending on the X-ray transmitted amount, whereby said scanning speed of the X-ray slit beam becomes faster for a soft tissue region in said object than for a hard tissue region in said object.