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Characteristic features of a high‐energy x‐ray spectra estimation method based on the Waggener iterative perturbation principle
Author(s) -
Iwasaki Akira,
Kubota Mamoru,
Hirota Junichi,
Fujimori Akira,
Suzaki Katsumasa,
Aoki Masahiko,
Abe Yoshinao
Publication year - 2006
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 - 10.1118/1.2359227
Subject(s) - spectral line , perturbation (astronomy) , physics , energy spectrum , iterative method , bin , x ray , energy (signal processing) , computational physics , mathematics , algorithm , optics , nuclear physics , quantum mechanics
We have redeveloped a high‐energy x‐ray spectra estimation method reported by Iwasaki et al. [A. Iwasaki, H. Matsutani, M. Kubota, A. Fujimori, K. Suzaki, and Y. Abe, Radiat. Phys. Chem. 67, 81–91 (2003)]. The method is based on the iterative perturbation principle to minimize differences between measured and calculated transmission curves, originally proposed by Waggener et al. [R. G. Waggener, M. M. Blough, J. A. Terry, D. Chen, N. E. Lee, S. Zhang, and W. D. McDavid, Med. Phys. 26, 1269–1278 (1999)]. The method can estimate spectra applicable for media at least from water to lead using only about ten energy bins. Estimating spectra of 4 – 15 MV x‐ray beams from a linear accelerator, we describe characteristic features of the method with regard to parameters including the prespectrum, number of transmission measurements, number of energy bins, energy bin widths, and artifactual bipeaked spectrum production.