Patent Number: 
Section: claims

1. A radiation detection apparatus for use in a radiation tomography apparatus, said radiation detection apparatus comprising:a detector element array in which a plurality of detector elements are arranged substantially in a fan-angle direction and in a cone-angle direction of a radiation;a collimator adhesively bonded to a side of said detector element array on which the radiation impinges, and having outer end surfaces on both sides in the cone-angle direction tapered to align with a direction of emission from a radiation source; anda pair of blocks disposed to sandwich said collimator in the cone-angle direction, and having inner end surfaces on both sides in the cone-angle direction tapered to align with said direction of emission. 2. The radiation detection apparatus as recited in claim 1, wherein: said outer end surface in said collimator on either side lies close to said inner end surface in said pair of blocks on either side and separated by a space. 3. The radiation detection apparatus as recited in claim 1, wherein: said outer end surface in said collimator on either side is adjacent to said inner end surface in said pair of blocks on either side with an elastic material interposed therebetween. 4. The radiation detection apparatus as recited in claim 1, wherein:said collimator comprises a plurality of collimator modules arranged in the fan-angle direction, andeach of said plurality of collimator modules has both end surfaces in the cone-angle direction tapered to align with said direction of emission. 5. The radiation detection apparatus as recited in claim 1, wherein:said collimator comprises a plurality of collimator modules arranged in the cone-angle direction, andeach of said plurality of collimator modules has both end surfaces in the cone-angle direction tapered to align with said direction of emission. 6. A radiation detection apparatus for use in a radiation tomography apparatus, said radiation detection apparatus comprising:a detector element array in which a plurality of detector elements are arranged substantially in a fan-angle direction and in a cone-angle direction of a radiation;a collimator adhesively bonded to a side of said detector element array on which the radiation impinges, and having outer end surfaces on both sides in the fan-angle direction tapered to align with a direction of emission from a radiation source; anda pair of blocks disposed to sandwich said collimator in the fan-angle direction, and having inner end surfaces on both sides in the fan-angle direction tapered to align with said direction of emission. 7. The radiation detection apparatus as recited in claim 6, wherein: said outer end surface in said collimator on either side lies close to said inner end surface in said pair of blocks on either side and separated by a space. 8. The radiation detection apparatus as recited in claim 6, wherein: said outer end surface in said collimator on either side is adjacent to said inner end surface in said pair of blocks on either side with an elastic material interposed therebetween. 9. The radiation detection apparatus as recited in any claim 6, wherein:said collimator comprises a plurality of collimator modules arranged in the fan-angle direction, andeach of said plurality of collimator modules has both end surfaces in the fan-angle direction tapered to align with said direction of emission. 10. The radiation detection apparatus as recited in claim 6, wherein: said pair of blocks are included in a support portion for directly or indirectly supporting said detector element array. 11. A radiation tomography apparatus including a radiation detection apparatus, said radiation detection apparatus comprising:a detector element array in which a plurality of detector elements are arranged substantially in a fan-angle direction and in a cone-angle direction of a radiation;a collimator adhesively bonded to a side of said detector element array on which the radiation impinges, and having outer end surfaces on both sides in the cone-angle direction tapered to align with a direction of emission from a radiation source; anda pair of blocks disposed to sandwich said collimator in the cone-angle direction, and having inner end surfaces on both sides in the cone-angle direction tapered to align with said direction of emission. 12. The radiation tomography apparatus as recited in claim 11, wherein:said outer end surface in said collimator on either side lies close to said inner end surface in said pair of blocks on either side and separated by a space. 13. The radiation tomography apparatus as recited in claim 12, wherein:said collimator comprises a plurality of collimator modules arranged in the fan-angle direction, andeach of said plurality of collimator modules has both end surfaces in the cone-angle direction tapered to align with said direction of emission. 14. The radiation tomography apparatus as recited in claim 12, wherein:said collimator comprises a plurality of collimator modules arranged in the cone-angle direction, andeach of said plurality of collimator modules has both end surfaces in the cone-angle direction tapered to align with said direction of emission. 15. The radiation tomography apparatus as recited in claim 11, wherein:said outer end surface in said collimator on either side is adjacent to said inner end surface in said pair of blocks on either side with an elastic material interposed therebetween. 16. The radiation tomography apparatus as recited in claim 15, wherein:said collimator comprises a plurality of collimator modules arranged in the fan-angle direction, andeach of said plurality of collimator modules has both end surfaces in the cone-angle direction tapered to align with said direction of emission. 17. The radiation tomography apparatus as recited in claim 15, wherein:said collimator comprises a plurality of collimator modules arranged in the cone-angle direction, andeach of said plurality of collimator modules has both end surfaces in the cone-angle direction tapered to align with said direction of emission. 18. The radiation tomography apparatus as recited in claim 11, wherein:said collimator comprises a plurality of collimator modules arranged in the fan-angle direction, andeach of said plurality of collimator modules has both end surfaces in the cone-angle direction tapered to align with said direction of emission. 19. The radiation tomography apparatus as recited in claim 18, wherein:said collimator comprises a plurality of collimator modules arranged in the cone-angle direction, andeach of said plurality of collimator modules has both end surfaces in the cone-angle direction tapered to align with said direction of emission. 20. The radiation tomography apparatus as recited in claim 11, wherein:said collimator comprises a plurality of collimator modules arranged in the cone-angle direction, andeach of said plurality of collimator modules has both end surfaces in the cone-angle direction tapered to align with said direction of emission.