Patent Number: 
Section: claims

1. A fastening device for an x-ray radiation diaphragm, comprising:a base plate adapted for mounting relative to an x-ray source that emits x-ray radiation, said base plate having an opening therein allowing passage of said x-ray radiation therethrough, said base plate being comprised of load-bearing material;a covering device fitted onto said base plate and defining an enclosure, in combination with said base plate, communicating with said opening and adapted to contain an x-ray radiation diaphragm therein;said base plate having a base plate surface and a first side wall projecting from a first side of said base plate surface and a second side wall projecting from a second side of said base plate surface;said covering device comprising a first cover attached to said first side wall at said first side of said base plate surface, and a second cover attached to said second side wall at said second side of said base plate surface; andsaid enclosure comprising a first enclosure portion defined by said first covering and said base plate, and adapted to contain a radiation filter therein, and a second enclosure portion, defined by said base plate and said second cover, and adapted to contain said radiation diaphragm therein. 2. A fastening device as claimed in claim 1 wherein said base plate has a base plate surface and a side wall projecting from said base plate surface, said covering device being attached to said side wall. 3. A fastening device as claimed in claim 1 wherein said covering device has an opening therein, substantially aligned with said opening in said base plate allowing passage of said x-ray radiation therethrough. 4. A fastening device as claimed in claim 1 wherein said covering device consists of a plurality of dimensionally stable but non-load bearing walls. 5. A fastening device as claimed in claim 4 wherein said covering device is comprised of an x-ray permeable material covered by a coating of an x-ray shielding material. 6. A fastening device as claimed in claim 5 wherein said covering device is covered at least at one side thereof with a layer of lead, forming said x-ray shielding material. 7. A fastening device as claimed in claim 1 wherein said base plate consists of aluminum. 8. A fastening device as claimed in claim 1 wherein said base plate comprises a base plate surface with a side wall projecting therefrom, to which said covering device is attached, said side wall consisting of aluminum. 9. A fastening device as claimed in claim 8 comprising a layer of x-ray shielding material on said side wall. 10. A fastening device as claimed in claim 9 wherein said x-ray shielding material comprises lead. 11. A fastening device for an x-ray radiation diaphragm, comprising:a base plate adapted for mounting relative to an x-ray source that emits x-ray radiation, said base plate having an opening therein allowing passage of said x-ray radiation therethrough, said base plate being comprised of load-bearing material;a covering device fitted onto said base plate and defining an enclosure, in combination with said base plate, communicating with said opening and adapted to contain an x-ray radiation diaphragm therein: andsaid base plate having a base plate surface and two first side walls projecting from a first side of said base plate surface at opposite sides of said opening, forming a first U-shaped profile at said first side of said base plate, and two second sidewalls projecting from a second side of said base plate at opposite sides of said opening forming a second U-shaped profile at said second side of said base plate, and said covering device comprising a first cover attached to said two first side walls and a second cover attached to said two second side walls. 12. A fastening device as claimed in claim 11 wherein said first cover has a U-shaped cross-section substantially adapted to match said first U-shaped profile, and wherein said second cover has a U-shaped cross-section substantially adapted to match said second U-shaped profile. 13. A fastening device as claimed in claim 11 wherein said covering device has an opening therein, substantially aligned with said opening in said base plate allowing passage of said x-ray radiation therethrough. 14. A fastening device as claimed in claim 11 wherein said covering device consists of a plurality of dimensionally stable but non-load bearing walls. 15. A fastening device as claimed in claim 14 wherein said covering device is comprised of an x-ray permeable material covered by a coating of an x-ray shielding material. 16. A fastening device as claimed in claim 15 wherein said covering device is covered at least at one side thereof with a layer of lead, forming said x-ray shielding material. 17. A fastening device as claimed in claim 11 wherein said base plate consists of aluminum. 18. A computed tomography apparatus comprising: a rotary frame;an x-ray source and an x-ray detector mounted on said rotary frame opposite each other, said x-ray source emitting x-ray radiation;a radiator filter;a diaphragm for gating said x-ray radiation;a fastening device for said diaphragm having a base plate mounted relative to said x-ray source, said base plate having an opening therein allowing passage of said x-ray radiation therethrough, said base plate being comprised of load-bearing material, and a covering device attached to said base plate and defining, in combination with said base plate an enclosure in which said diaphragm is contained; andsaid covering device of said fastening device comprising a first cover attached to a first side of said base plate and defining a first portion of said enclosure, in which said radiation filter is contained, and a second cover, attached to a second side of said base plate, opposite said first side, defining a second portion of said enclosure in which said diaphragm is contained.