Patent ID: 7310407
Filing Date: 2007-12-18
Classification: A61B,G01T

Abstract:
1. An apparatus for characterizing an emission from a field of view and an x-ray transmissivity of the field of view, the apparatus comprising: an x-ray source located adjacent to the field of view, the x-ray source providing x-rays; a source mask located between the x-ray source and the field of view, the source mask having a source aperture through which the x-rays pass, the x-rays having a path direction through the field of view; an emission detector located adjacent to the field of view, the emission detector detecting the emission from the field of view; and an x-ray detector located between the emission detector and the field of view so as to receive the x-ray beam after the x-ray beam passes through the field of view, wherein the emission detector is shielded from the x-rays, the emission detector providing an emission signal correlated with the emissions from the field of view, the x-ray detector providing an x-ray detector signal correlated with the x-ray transmissivity of the field of view for the path direction, the apparatus further comprising an x-ray shield having a plurality of shield apertures therethrough, the shield apertures being positioned so as to allow emission from the field of view to reach the emission detector, the x-ray shield preventing x-rays from reaching the emission detector.