Patent Number: 
Section: claims

1. An apparatus for detection of radiation comprising: at least a first collimator arranged to transmit radiation, emitted from a radiation source, through at least a first slit in a Z-direction and prevent radiation in said Z-direction apart from through said at least first slit,  at least a first array of at least two radiation detecting elements,  each of said radiation detecting elements having a width xcex1 in an X-direction, where said X-direction is the direction of said array of radiation detecting elements,  each of said radiation detecting elements having a length xcex2 in a Y-direction,  said at least first slit, for letting through radiation in the Z-direction, having a length in said second X-direction which is at least as long as said array of radiation detecting elements,  said at least first slit having a length in said Y-direction which is substantially shorter than said length xcex2 of said radiation detecting elements, and  displacement means arranged to move said collimator and/or said array of radiation detecting elements. 2. The apparatus according to  claim 1 , wherein claim 1 at least a second array of radiation detecting elements, having said width xcex1 in said X-direction and said length xcex2 in said Y-direction,  said at least first array of radiation detecting elements and said at least second array of radiation detecting elements being displaced in relation to each other substantially only in the Y-direction with a distance substantially equal to xcex2,  said collimator comprise at least a second slit having a length in said second X-direction which is at least as long as said at least second array of radiation detecting elements, and a length in said Y-direction which is substantially shorter than said length xcex2,  said at least first and at least second slits being displaced in relation to each other substantially only in the Y-direction with a distance substantially equal to xcex2, and  said first and second slits are fixed in relation to each other, and said first and second arrays of radiation detecting elements are fixed in relation to each other. 3. The apparatus according to  claim 1 , wherein claim 1 said displacement means is arranged to move said collimator in relation to said radiation detecting elements in said Y-direction over substantially the complete length xcex2 of said radiation detecting elements. 4. The apparatus according to  claim 1 , wherein claim 1 said displacement means is arranged to move said collimator in relation to said radiation detecting elements in said Y-direction over a length substantially longer than the length xcex2, e.g. 2*xcex2, 3*xcex2 or any multiple of xcex2. 5. The apparatus according to  claim 1 , wherein claim 1 each of said radiation detecting elements is arranged to repeatedly detect values during the relative movement of said collimator and radiation detecting elements so as to obtain multiple values for the radiation admitted through said slit to said corresponding radiation detecting elements. 6. The apparatus according to  claim 1 , wherein claim 1 said movement is a translation of said collimator in the Y-direction over said at least first array of radiation detecting elements. 7. The apparatus according to  claim 1 , wherein claim 1 said movement is a pivoting movement of the collimator and radiation source in relation to the radiation detecting elements. 8. The apparatus according to  claim 1 , wherein said collimator is arranged to substantially completely cover each of said radiation detecting elements, during said movement, from radiation, apart from radiation admitted through said slit to said radiation detecting elements. claim 1 9. The apparatus according to  claim 8 , wherein claim 8 a second collimator, having at least two elongated openings separated by a distance xcex2, is arranged at a distance xcex3 in the Z-direction from said first collimator, wherein said distance xcex3 is selected to allow an object to be positioned between said first and second collimator, and  said first and second collimator is fixed in relation to each other so that X-rays emitted from the X-ray source and transmitted through said slits in the second collimator are transmitted through the corresponding slits in the first collimator. 10. The apparatus according to  claim 1 , wherein said width xcex1 is substantially shorter than said length xcex2, and said length of said array is substantially longer than said length xcex2. claim 1 11. The apparatus according to  claim 1 , wherein said radiation detection means is a CCD. claim 1 12. The apparatus according to  claim 1 , wherein said radiation detecting elements is a TFT array. claim 1 13. The apparatus according to  claim 1 , wherein said radiation detecting elements is a C-mos detector. claim 1 14. The apparatus according to  claim 1 , wherein said radiation detecting elements is PIN-diodes. claim 1 15. The apparatus according to  claim 1 , wherein said apparatus comprises a gas detector having an ionisable gas arranged between an anode and an cathode and being arranged to detect electrons emitted by said gas due to said radiation and accelerated by a voltage across said anode and cathode. claim 1 16. The apparatus according to  claim 15 , wherein said gas detector comprises means for electron avalanche amplification. claim 15 17. The apparatus according to  claim 1 , wherein said detector elements comprise a radiation detection area which is substantially as wide in the X-direction as said distance xcex1. claim 1 18. The apparatus according to  claim 1 , wherein said detector elements comprise a radiation detection area, which has a width xcex5 in X-direction that is substantially shorter than said distance xcex1. claim 1 19. The apparatus according to  claim 18 , wherein claim 18 said displacement means is arranged to repeatedly move said collimator in relation to said radiation detecting elements back and fourth in said Y-direction over substantially the complete length xcex2 of said radiation detecting elements, and  said displacement means is arranged to move said radiation detecting elements and said collimator substantially a distance xcex5 in the X-direction for each repetition of movement in said Y-direction. 20. An X-ray imaging device comprising the detector apparatus according to  claim 1 , comprising claim 1 an X-ray source arranged displaced in the Z-direction in relation to said collimator and arranged to emit X-rays in at least said Z-direction towards said radiation detection means and said radiation is arranged to pass through an object to be imaged,  said collimator being arranged to scan over substantially the complete object, and  said radiation detection device being arranged to repeatedly detect the radiation reaching said radiation detection device so as to construe a scanned image of the X-rayed object. 21. A method for detection of radiation comprising: at least a first collimator arranged to transmit radiation through at least a first slit in a Z-direction and prevent radiation in said Z-direction at other positions,  at least a first array of radiation detecting elements comprising at least two radiation detecting elements,  that each of said radiation detecting elements having a width xcex1 in a X-direction, where said X-direction is the direction of said array of radiation detecting elements,  that each of said radiation detecting elements having a length xcex2 in a Y-direction,  that said at least first slit, for letting through radiation in the Z-direction, has a length in said second X-direction which is at least as long as said array of radiation detecting elements,  that said at least first slit has a length in said Y-direction which is substantially shorter than said length xcex2 of said radiation detecting elements, and comprising the step of:  moving said collimator in relation to said radiation detecting elements in the Y-direction over substantially the complete length xcex2 of said radiation detecting elements. 22. The method according to  claim 21 , comprising claim 21 at least a second array of radiation detecting elements, having same characteristics as said at least first radiation detecting elements,  said collimator comprise at least a second slit having same characteristics as said at least first slit, and comprising the further steps of:  displacing said at least first and at least second slit in relation to each other substantially only in the Y-direction with a distance substantially equal to xcex2,  displacing said at least first array of radiation detecting elements and said at least second array of radiation detecting elements in relation to each other substantially only in the Y-direction with a distance substantially equal to xcex2, and  fixing said first and second slit, and said first and second array of radiation detecting elements in relation to each other. 23. The method according to  claim 21 , comprising the further step of: claim 21 continuously detecting a value corresponding to the detected radiation during the relative movement of said collimator and radiation detecting elements, so as to obtain multiple values for the radiation admitted through said slit to said corresponding radiation detecting elements. 24. The method according to  claim 21 , wherein claim 21 said movement is a translation of said collimator in the Y-direction over said at least first array of radiation detecting elements. 25. The method according to  claim 21 , wherein claim 21 said movement is a pivoting movement of the collimator and radiation source in relation to the radiation detecting elements. 26. The method according to  claim 21 , wherein said width xcex1 is substantially shorter than said length xcex2, and said length of said array is substantially longer than said length xcex2. claim 21 27. The method according to  claim 21 , wherein said radiation detection means is a CCD. claim 21 28. The method according to  claim 21 , wherein said radiation detecting elements is a TFT. claim 21 29. The method according to  claim 21 , wherein said radiation detecting elements is a C-mos detector. claim 21 30. The method according to  claim 21 , wherein said radiation detecting elements is PIN-diodes. claim 21 31. The method according to  claim 21 , wherein said radiation detection means comprises a gas detector having an ionisable gas arranged between an anode and an cathode and being arranged to detect electrons emitted by said gas due to said radiation and accelerated by a voltage across said anode and cathode. claim 21 32. The method according to  claim 31 , wherein said gas detector is arranged to perform electron avalanche amplification. claim 31 33. The method according to  claim 21 , wherein claim 21 a second collimator, having at least two elongated openings separated by a distance xcex2, is arranged at a distance xcex3 in the Z-direction from said first collimator, wherein said distance xcex3 is selected to allow an object to be positioned between said first and second collimators, and  said first and second collimator is fixed in relation to each other so that X-rays emitted from the X-ray source and transmitted through said slits in the second collimator are transmitted through the corresponding slits in the first collimator. 34. The method according to  claim 21 , wherein said detector elements comprise a radiation detection area which is substantially as wide in the X-direction as said distance xcex1. claim 21 35. The method according to  claim 21 , wherein said detector elements comprise a radiation detection area, which has a width xcex5 in X-direction that is substantially shorter than said distance xcex1. claim 21 36. The method according to  claim 35 , wherein claim 35 said displacement means is arranged to repeatedly move said collimator in relation to said radiation detecting elements back and fourth in said Y-direction over substantially the complete length xcex2 of said radiation detecting elements, and  said displacement means is arranged to move said radiation detecting elements and said collimator substantially a distance xcex5 in the X-direction for each repetition of movement in said Y-direction.