Patent ID: 9268029
Filing Date: 2016-02-23
CPC Classification: A61N,G01T

Claim Text:
1. A method for measuring a two-dimensional distribution of ionizing radiation doses with high spatial resolution comprising exposing a radiation sensitive film to a pattern of ionizing radiation that is to be measured to produce a measurement film and exposing one or more radiation sensitive films to known calibrated doses of said ionizing radiation to produce one or more scaling films, simultaneously scanning said measurement film and said scaling film(s) together with an unexposed radiation sensitive film in a multiplicity of measurement channels to produce a digital image, measuring those areas of the digital image corresponding to said unexposed film and said scaling film(s) in said measurement channels, converting said digital image to a map of dose values based on a previously determined mathematical relationship between measured scanner response values for the film in said measurement channels and radiation dose and subsequently adjusting all the dose values corresponding to said digital image using a mathematical function so that the dose values in the areas of said digital image representative of said unexposed film and said scaling films are equal to the calibrated dose values to which they were exposed, wherein all of the radiation sensitive films are the same type of film wherein at least one scaling film is exposed to a radiation dose greater than the highest dose in the measurement film.