Patent ID: 8406373

Claim:
An imaging system, the system comprising: an electromagnetic radiation source for directing a beam at an object to be imaged; a modulator placed between the radiation source and the object to be imaged; and a computer for performing calculations based on a desired distribution of image quality to determine a pattern of fluence to be applied by the modulator, wherein the modulator comprises a plurality of individual elements, each being substantially impervious to radiation and being movable between an open position and a closed position, wherein open positions of the individual elements define an aperture permitting passage of the beam from the radiation source, wherein the modulator is configured as a louvre compensator comprising a first set of substantially parallel louvres extending in one direction and a second set of substantially parallel louvres extending in another direction and overlapping the first set, and wherein, by selected positioning of at least one louvre of the first set in the open position and at least one louvre of the second set in the open position, an aperture is defined for passage of the beam from the radiation source to the object.