Patent ID: 6528803
Filing Date: 2003-03-04
Classification: A61N,G01T

Abstract:
A method of reducing effects of film processing variations on radiation film dosimetry comprising:irradiating unique areas of one or more calibration films with different radiation dose levels to obtain a first calibration relating optical density to radiation dose, the first calibration comprising data pairs of optical density, OD1(d1), and radiation dose, d1; exposing a non-irradiated portion of at least one of the calibration films to light from an array of standardized light sources to obtain a first optical density step gradient, (OD1(s), s), wherein s refers to a particular standardized light source, exposing a non-irradiated portion of a test film to light from the array of standardized light sources to obtain a second optical density step gradient, (OD2(s), s); and modifying the first calibration based on differences between (OD1(s), s) and (OD2(s), s).