Patent Number: 
Section: abstract

The present invention relates to an apparatus and a method for detection of radiation comprising at least a first collimator arranged to transmitted radiation 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. The invention further comprises at least a first array of at least two radiation detecting elements, that each of said radiation detecting elements having xcex1 length a in an 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 displacement means arranged to move said collimator and/or said array of radiation detecting elements.