Patent ID: 7402806

Claim:
A system comprising: a light source configured to generate a light beam; a controller operably connected to the light source and configured to scan the light beam across a computed radiography imaging plate in at least a first direction (x) to stimulate emission of a plurality of photons from the computed radiography imaging plate; a mask comprising a positionable aperture configured to transmit the light beam to the computed radiography imaging plate at a beam position x 0 , wherein a position of the aperture is synchronized with a position of the light beam, wherein the mask comprises a one dimensional array of cells that extends along the first direction (x) such that the light beam scans across the one dimensional array of cells, and wherein each of the cells is selectively addressable and configured to be opened and closed, wherein the controller is further configured to control the mask; a collecting means configured to collect the photons emitted from the computed radiography imaging plate; an optical filter configured to filter residual stimulating light from the collected photons; a detector for collecting the photons from the optical filter; and a correction module configured to: perform a first measurement comprising: opening a cell at the beam position x 0 and closing a set of cells at preceding beam positions x 1 -xN, wherein the detector collects the photons to generate an uncorrected photon count signal measurement; perform at least N−1 additional measurements to generate a respective plurality of N−1 corrective photon count signal measurements, each of the corrective measurements comprising: opening at least one member of the set of cells at preceding beam positions x 1 -xN, and collecting the photons using the detector to generate the respective corrective photon count signal measurement; and generate a corrected active emission signal using the corrective photon count signal measurements.