Companding technique for high dynamic range measurements using Gafchromic films
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Published on: June 16, 2020
Frank Van den Heuvel1, Wouter Crijns, Gilles Defraene
1Department of Experimental Radiotherapy, Catholic University of Leuven, Leuven, Belgium B-3000. frank.vandenheuvel@uz.kuleuven.ac.be
Purpose:
To introduce a methodology to perform dose measurements using Gafchromic films which can span several decades of dose levels.
Methods:
The technique is based on a rescaling approach using different films irradiated at different dose levels. This is combined with a registration protocol correcting positioning and scaling factors for each film. The methodology is validated using TLD's for out-of-field doses. Furthermore, two examples are provided using the technique to characterize small sized radiosurgery cones and compared with measurements made with a pinpoint chamber.
Results:
Excellent agreement with TLD, planning systems and measurement was found. The superior resolution of the film technique was apparent.
Conclusions:
The authors have introduced a new technique allowing users to quantify very low doses in conjunction with commissioning measurements. The use of film also provides 2D information on beam characteristics in high resolution measurements.
