Patent ID: 7400703
Filing Date: 2008-07-15
Classification: G21K

Abstract:
1. A method for selectively controlling a spatial distribution of radiation intensity of an output radiation beam of an imaging device operable to create an output image of a subject, the method comprising the acts of: (a) passing an initial radiation beam through a control device comprising a first radiation absorbing structure in alignment relative a second radiation absorbing structure to receive the radiation beam, wherein at least one of the first and second radiation absorbing structure is configured to articulate; (b) adjusting a position of the first radiation absorbing structure in relation to a position of the second radiation absorbing structure in accordance to a modulator configuration signal; (c) creating a combined transmittance pattern that includes a moiré pattern having a lower frequency field of transmittance not found in a transmittance field produced from one of the first and second radiation absorbing structures; (d) locating the moiré pattern so as to direct the lower frequency transmittance of the output radiation beam at the subject.