PMID: 9167170May 1, 1997Paper

Validation of reconstructed bremsstrahlung spectra between 6 MV and 25 MV from measured transmission data

Medical Physics
P FrancoisO Caselles

Abstract

We have previously investigated a method of high-energy x-ray spectral reconstruction from transmission data by direct resolution of a matrix system. This technique uses the spectral vectorial algebra formalism. The resolution has previously been tested on a 12 MV photon beam. To extend and to test the validity of the results to the entire radiotherapy energy range, we have performed the method on photon beams with nominal energies of 6, 12, 15, and 25 MV. The influence on the 6 MV spectrum of a 60 degrees built-in wedge has also been investigated to test the sensitivity of the method and the results are reported. To validate our reconstructed spectra, dosimetric quantities such as tissue phantom ratios (TPR), water-to-air stopping power ratios (S/p) air water, and quality indexes TPR 10 (20) have been calculated. The results show good agreement between the measured and calculated data. Mean mass energy absorption coefficient ratios for different materials have also been computed and compared to data published recently and the results are very close (within +/- 0.5%). Primary depth dose functions in water have also been computed to deduce primary dose attenuation coefficients.

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Citations

Dec 10, 2009·Medical Physics·Timothy C ZhuUNKNOWN AAPM Therapy Physics Committee Task Group 74
Apr 5, 2002·Medical Physics·Daryoush Sheikh-Bagheri, D W O Rogers
Jun 3, 1998·Medical Physics·P Bloch, J McDonough
Apr 25, 2001·Medical Physics·M StampanoniP Rüegsegger
Sep 24, 2005·Physics in Medicine and Biology·L D Paniak, P M Charland
Dec 10, 1999·Physics in Medicine and Biology·A Ahnesjö, M M Aspradakis
Aug 6, 1999·Medical Physics·R G WaggenerW D McDavid
Feb 8, 2000·Physics in Medicine and Biology·P BlochJ McDonough

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