[Improvement of the accuracy of the Laplace transform method for the determination of radiotherapy spectra of clinical linear accelerators].
The present study focused on the reconstruction of the bremsstrahlung spectrum of a clinical linear accelerator from the measured transmission curve, with the aim of improving the accuracy of this method. The essence of the method was the analytic inverse Laplace transform of a parameter function fitted to the measured transmission curve. We tested known fitting functions, however they resulted in considerable fitting inaccuracy, leading to inaccuracies of the bremsstrahlung spectrum. In order to minimise the fitting errors, we employed a linear combination of n equations with 2n-1 parameters. The fitting errors are now considerably smaller. The measurement of the transmission function requires that the energy-dependent detector response is taken into account. We analysed the underlying physical context and developed a function that corrects for the energy-dependent detector response. The factors of this function were experimentally determined or calculated from tabulated values.
Klinik für Radiologie, Abt. Strahlentherapie, Universitätsklinikum Jena. marcel.scheithauer@med.uni-jena.de
Marcel
M
Scheithauer
Michael
M
Schwedas
Tilo
T
Wiezorek
Andreas
A
Keller
Thomas G
TG
Wendt
Dietrich
D
Harder
D008962:Models, Theoretical; D010315:Particle Accelerators; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods / Q000592:standards; D011882:Radiotherapy, High-Energy / Q000379:methods / Q000592:standards; D015203:Reproducibility of Results