Patent ID: 8212203

Claim:
A radiation dosimetry method comprising: scanning a radiation dosimetry calibration film, said calibration film comprising a plurality of imaged areas corresponding to a plurality of known radiation dose levels to generate a digital image, I C , with at least two component channels I C1 and I C2 ; determining a first calibration curve for response values in a first component channel as a function of dose; determining a second calibration curve for response values in a second component channel as a function of dose; determining a conversion function between response values in the first component channel and response values in the second component channel; scanning a radiation dosimetry measurement film which has been exposed to a dose of radiation to generate a digital image, I M ; with at least two component channels I M1 and I M2 ; wherein said radiation dosimetry calibration film and said radiation dosimetry measurement film each comprises a substrate and a layer of radiation-sensitive material disposed on said substrate wherein said radiation-sensitive material comprises a radiation-sensitive active component and a radiation-impervious dye; using said conversion function between response values in the first and second components channels of a calibration image to determine, for a measurement image I M1 in the first component channel, the calculated response values in an image, I M,C2 , in the second component channel; using the difference in the measured response values of the image I M2 in the second component channel and said calculated response values of image I M,C2 to calculate a correction image; and using said correction image to adjust the image I M,1 to provide a corrected image I M,1,Corrected wherein said corrected image accounts for variations in thickness of the radiation-sensitive layer.