Embodiments relate to a slit collimator assembly including a first set of panels spaced at least partially around a longitudinal axis of the collimator assembly and extending generally parallel to the longitudinal axis. The slit collimator assembly further includes a second set of panels spaced at least...http://www.google.co.uk/patents/US7723690?utm_source=gb-gplus-sharePatent US7723690 - Adjustable slit collimators method and system
