Simplified alignment and increased efficiency of X-ray imaging apparatus setup

A scanned-slot x-ray imaging system comprising:

• a first collimator and a second collimator,
• wherein each collimator further comprises a carrier arranged with plurality of substantially parallel slots, each arranged in a first distance and a second distance, respectively, from a radiation source and each provided with slots and a detector located after the second collimator slots,
• said slots of said second collimator being wider than the said slots of said first collimator and said detector under the second slots is wider than the first collimator slots and the second collimator slots,
• wherein said slots of said second collimator has a width not less than a safety margin and the product of the width of corresponding slots of said first collimator and said second distance divided by said first distance, said width being arranged to allow a misalignment with respect to a central symmetry line of said slots and prevents introduction of a dead area on the detector.