Patent Number: 
Section: claims

1. A system for registering a radiation image, comprising: a radiation pick-up device comprising a charge layer wherein electrical charges are generated dependent on radiation incident on said charge layer, an electrode layer allocated to said charge layer that is chargeable with high-voltage for triggering an electron-multiplying avalanche effect in said charge layer by producing a potential across said charge layer resulting from said high voltage, and a read-out device for reading out charges generated in said charge layer using an electron beam;  a reset light source positioned for exposing said charge layer to reset said charge layer to a selected charge level; and  a control device connected to said radiation pick-up device, said high voltage being supplied to said electrode layer by said control unit and said control unit varying said high voltage to vary a gain of said charge layer caused by said avalanche effect. 2. A system as claimed in  claim 1  wherein said control unit varies said high voltage while radiation is incident on said charge layer. claim 1 3. A system as claimed in  claim 2  wherein said control unit varies an amplitude of said high voltage dependent on a dose of said radiation incident on said charge layer. claim 2 4. A system as claimed in  claim 1  wherein said electrode layer comprises a film disposed on a carrier. claim 1 5. A system as claimed in  claim 4  wherein said carrier is comprised of glass. claim 4 6. A system as claimed in  claim 4  wherein said electrode layer is printed on said carrier. claim 4 7. A system as claimed in  claim 4  wherein said electrode layer comprises a plurality of substantially parallel layer strips spaced from each other. claim 4 8. A system as claimed in  claim 1  wherein said read-out device is a flat emitter device. claim 1 9. A system as claimed in  claim 8  wherein said flat emitter device comprises a plurality of electron emitter cathodes having deflection electrodes respectively allocated thereto. claim 8 10. A system as claimed in  claim 8  wherein said flat emitter device comprises micro-structured electron emitter cathodes. claim 8 11. A system as claimed in  claim 10  wherein said micro-structured electron emitter cathodes are arranged in a matrix. claim 10 12. A system as claimed in  claim 10  wherein said micro-structured electron emitter cathodes are arranged in an array. claim 10 13. A system as claimed in  claim 8  comprising a vacuum housing with fiat housing walls in which said radiation pick-up device is disposed, said housing walls having stabilization elements thereon. claim 8 14. A system as claimed in  claim 13  wherein said stabilization elements comprise structural webs. claim 13 15. A system as claimed in  claim 1  wherein said reset light source is connected to and is controlled by said control device. claim 1 16. A system as claimed in  claim 15  wherein said control device operates said reset light source in a pulsed manner. claim 15