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A study of quality of bremsstrahlung spectra reconstructed from transmission measurements
Author(s) -
Piermattei A.,
Arcovito G.,
Azario L.,
Bacci C.,
Bianciardi L.,
De Sapio E.,
Giacco C.
Publication year - 1990
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.596567
Subject(s) - bremsstrahlung , dosimetry , fluence , stopping power , spectral line , computational physics , physics , optics , radiation , beam (structure) , materials science , nuclear medicine , photon , medicine , laser , astronomy , detector
A numerical method for the reconstruction of bremsstrahlung spectra has been applied to the analysis of simulated data. The method is found to be reliable in reconstructing x‐ray spectra of maximum energy up to 10 MeV. Measurements of aluminum transmission data carried out for five linear accelerators have also been analyzed by this method to determine the fractional energy fluence. The values of the Spencer–Attix water/air stopping power ratio,S w , air S . A . , reported as a function of the ratios TPR 10 20 , are in good agreement with computed results. Quality index values were correlated to mean incident energies of x‐ray beams used in radiotherapy. The experimental setup has also provided information regarding the softening effect on the off‐axis beam, which can be used in clinical computer dosimetry to correct conventional zero field size tissue maximum ratio.