Title :
Uncertainty analysis in the simulation of X-ray spectra in the diagnostic range using the MCNP5 code
Author :
Gallardo, S. ; Querol, A. ; Ródenas, J. ; Verdù, G.
Author_Institution :
Chemical and Nuclear Engineering Department, Universidad Politécnica de Valencia, Valencia 46022 Spain
fDate :
Aug. 30 2011-Sept. 3 2011
Abstract :
An accurate knowledge of the photonic spectra emitted by X-ray tubes in radiodiagnostics is essential to better estimate the imparted dose to patients and to improve the image quality obtained with these devices. In this work, several X-ray spectra have been simulated using the MCNP5 code to simulate X-ray production in a commercial device. To validate the Monte Carlo results, simulated spectra have been compared to those extracted from the IPEM 78 database. The uncertainty associated to some geometrical features of the tube and its effect on the simulated spectra has been analyzed using the Noether-Wilks formula. This analysis has been focused on the thickness of collimators, filters, shielding and barrel shutter. Furthermore, results show that the uncertainty due to geometrical parameters (0.98% in terms of Root Mean Squared) is higher than the statistical uncertainty associated to the MCNP5 calculations.
Keywords :
Analytical models; Collimators; Electron tubes; Lead; Mathematical model; Photonics; Uncertainty; Computer Simulation; Models, Statistical; Monte Carlo Method; Radiation Dosage; Radiometry; Scattering, Radiation; Software; Tomography, X-Ray Computed; X-Rays;
Conference_Titel :
Engineering in Medicine and Biology Society, EMBC, 2011 Annual International Conference of the IEEE
Conference_Location :
Boston, MA
Print_ISBN :
978-1-4244-4121-1
Electronic_ISBN :
1557-170X
DOI :
10.1109/IEMBS.2011.6090125