A study of quality of bremsstrahlung spectra reconstructed from transmission measurements

Journal Article · Thu Mar 01 04:00:00 EST 1990 · Medical Physics; (USA)

DOI:https://doi.org/10.1118/1.596567· OSTI ID:6765791

Piermattei, A; Arcovito, G; Azario, L; Bacci, C; Bianciardi, L; De Sapio, E; Giacco, C ^[1]

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1. Universita, Cattolica S. C., Rome (Italy)

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, SS.A. w,air, reported as a function of the ratios TPR20 10, 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.

• OSTI ID: 6765791
• Journal Information: Medical Physics; (USA), Journal Name: Medical Physics; (USA) Vol. 17:2; ISSN 0094-2405; ISSN MPHYA
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
655003* -- Medical Physics-- Dosimetry
ACCELERATORS
BREMSSTRAHLUNG
DATA PROCESSING
ELECTROMAGNETIC RADIATION
LINEAR ACCELERATORS
PROCESSING
RADIATIONS
SIMULATION
SPECTRA
SPECTRA UNFOLDING
X-RAY SPECTRA