Sensitivity of film measured off-axis ratios to film calibration curve using radiochromic film
DOI:
https://doi.org/10.29384/rbfm.2011.v5.n1.p21-24Abstract
Off-axis ratios of conical beams generated with a stereotactic radiosurgery-dedicated LINAC were measured with EBT2 film and stereotactic diode. The sensitivity of both full width at half maximum (FWHM) and penumbras (80-20% and 90-10%, respectively), with respect to the characteristics of the film calibration curve fit, was investigated. In all cases, penumbras resulted to be more sensitive than FWHM. However, these differences were, in general, smaller than the ones found between EBT2 reference values and the stereotactic diode measurements. The larger variation in OAR parameters was found to depend on whether the fit intersected or not the origin. A 1D gamma-index analysis showed this difference can be important in all measured conical beams.Downloads
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How to Cite
García-Hernández, D., & Lárraga-Gutiérrez, J. M. (2015). Sensitivity of film measured off-axis ratios to film calibration curve using radiochromic film. Brazilian Journal of Medical Physics, 5(1), 21–24. https://doi.org/10.29384/rbfm.2011.v5.n1.p21-24
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