X-Ray imaging device for directly displaying X-ray images
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorLyuji Ozawa
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Abstract
A device for directly displaying X-ray images on a phosphor screen of a cathode ray tube by means of a steady cathodoluminescence is arranged such that the excitation of the phosphor screen is controlled by the persistent polarization and depolarization of the phosphor crystals in the phosphor screen by exposure to X-rays. The X-ray images formed on the phosphor screen in the cathode ray tube may be read out by synchronously detecting changes in the electric current of the collecting electrodes of the tube during the scanning of a reading electron beam on the phosphor screen displaying the X-ray images.
Claims20
An X-ray imaging device for directly displaying X-ray images on a screen, comprising:
- a layer of phosphor crystals arranged on said screen;
- at least one cathode for emitting electrons which impinge on said phosphor screen, said crystals being excited by said electrons so as to display said X-ray image by a steady cathodoluminescence;
- wherein said phosphor crystal excitation is controlled by the persistent polarization and depolarization thereof, said crystals emitting said steady cathodoluminescence only when depolarized and said crystals comprising a material which is depolarized when X-rays irradiate said persistently polarized crystals.
Dependencies are inferred from the claim text.