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Companding technique for high dynamic range measurements using Gafchromic films.

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

Medical Physics

|December 14, 2011

Summary

This study introduces a novel Gafchromic film dosimetry method for precise dose measurements across a wide range of levels. The technique offers superior resolution for characterizing radiation beams and aids in commissioning measurements.

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Area of Science:

Medical Physics
Radiation Oncology
Dosimetry

Background:

Accurate dose measurement is critical in radiation therapy for treatment efficacy and patient safety.
Existing dosimetry methods may have limitations in dynamic range or spatial resolution.

Purpose of the Study:

To present a new methodology for dose measurements using Gafchromic films capable of covering several orders of magnitude of dose levels.
To validate the technique and demonstrate its application in characterizing radiation beams.

Main Methods:

A rescaling approach using multiple Gafchromic films irradiated at different doses.
A registration protocol to correct for positioning and scaling factors.
Validation using Thermoluminescent Dosimeters (TLDs) for out-of-field doses and comparison with pinpoint chamber measurements for radiosurgery cones.

Main Results:

Excellent agreement was observed between the Gafchromic film method, TLDs, and planning systems.
The Gafchromic film technique demonstrated superior spatial resolution compared to conventional methods.
The method successfully characterized small radiosurgery cones.

Conclusions:

A novel film-based dosimetry technique has been developed for quantifying a broad range of radiation doses, including very low levels.
This method is valuable for commissioning measurements and provides high-resolution 2D information on beam characteristics.
The technique enhances the precision and detail in radiation dosimetry applications.