SUET121: Analyzing the Broadening Effect On the Bragg Peak Due to Heterogeneous Geometries and Implementing UserRoutines in the MonteCarlo Code FLUKA in Order to Reduce Computation Time
Abstract
Purpose: Aim of this study was to analyze the modulating, broadening effect on the Bragg Peak due to heterogeneous geometries like multiwire chambers in the beam path of a particle therapy beam line. The effect was described by a mathematical model which was implemented in the MonteCarlo code FLUKA via userroutines, in order to reduce the computation time for the simulations. Methods: The depth dose curve of 80 MeV/u C12ions in a water phantom was calculated using the MonteCarlo code FLUKA (reference curve). The modulating effect on this dose distribution behind eleven meshlike foils (periodicity ∼80 microns) occurring in a typical set of multiwire and dose chambers was mathematically described by optimizing a normal distribution so that the reverence curve convoluted with this distribution equals the modulated dose curve. This distribution describes a displacement in water and was transferred in a probability distribution of the thickness of the eleven foils using the water equivalent thickness of the foil’s material. From this distribution the distribution of the thickness of one foil was determined inversely. In FLUKA the heterogeneous foils were replaced by homogeneous foils and a userroutine was programmed that varies the thickness of the homogeneous foils for each simulated particlemore »
 Authors:

 Institute of Medical Physics and Radiation Protection (IMPS), Giessen, DE (Germany)
 Publication Date:
 OSTI Identifier:
 22545247
 Resource Type:
 Journal Article
 Journal Name:
 Medical Physics
 Additional Journal Information:
 Journal Volume: 42; Journal Issue: 6; Other Information: (c) 2015 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 00942405
 Country of Publication:
 United States
 Language:
 English
 Subject:
 60 APPLIED LIFE SCIENCES; ANIMAL TISSUES; BRAGG CURVE; CARBON 12; DEPTH DOSE DISTRIBUTIONS; LUNGS; MONTE CARLO METHOD; ORGANIC MATTER; PARTICLE BEAMS; PHANTOMS; RADIATION DOSES; RADIOTHERAPY; SIMULATION; THICKNESS
Citation Formats
Baumann, K, Weber, U, Simeonov, Y, Zink, K, and Department of Radiotherapy and Radiooncology, University Medical Center GiessenMarburg, Marburg, DE. SUET121: Analyzing the Broadening Effect On the Bragg Peak Due to Heterogeneous Geometries and Implementing UserRoutines in the MonteCarlo Code FLUKA in Order to Reduce Computation Time. United States: N. p., 2015.
Web. doi:10.1118/1.4924482.
Baumann, K, Weber, U, Simeonov, Y, Zink, K, & Department of Radiotherapy and Radiooncology, University Medical Center GiessenMarburg, Marburg, DE. SUET121: Analyzing the Broadening Effect On the Bragg Peak Due to Heterogeneous Geometries and Implementing UserRoutines in the MonteCarlo Code FLUKA in Order to Reduce Computation Time. United States. doi:10.1118/1.4924482.
Baumann, K, Weber, U, Simeonov, Y, Zink, K, and Department of Radiotherapy and Radiooncology, University Medical Center GiessenMarburg, Marburg, DE. Mon .
"SUET121: Analyzing the Broadening Effect On the Bragg Peak Due to Heterogeneous Geometries and Implementing UserRoutines in the MonteCarlo Code FLUKA in Order to Reduce Computation Time". United States. doi:10.1118/1.4924482.
@article{osti_22545247,
title = {SUET121: Analyzing the Broadening Effect On the Bragg Peak Due to Heterogeneous Geometries and Implementing UserRoutines in the MonteCarlo Code FLUKA in Order to Reduce Computation Time},
author = {Baumann, K and Weber, U and Simeonov, Y and Zink, K and Department of Radiotherapy and Radiooncology, University Medical Center GiessenMarburg, Marburg, DE},
abstractNote = {Purpose: Aim of this study was to analyze the modulating, broadening effect on the Bragg Peak due to heterogeneous geometries like multiwire chambers in the beam path of a particle therapy beam line. The effect was described by a mathematical model which was implemented in the MonteCarlo code FLUKA via userroutines, in order to reduce the computation time for the simulations. Methods: The depth dose curve of 80 MeV/u C12ions in a water phantom was calculated using the MonteCarlo code FLUKA (reference curve). The modulating effect on this dose distribution behind eleven meshlike foils (periodicity ∼80 microns) occurring in a typical set of multiwire and dose chambers was mathematically described by optimizing a normal distribution so that the reverence curve convoluted with this distribution equals the modulated dose curve. This distribution describes a displacement in water and was transferred in a probability distribution of the thickness of the eleven foils using the water equivalent thickness of the foil’s material. From this distribution the distribution of the thickness of one foil was determined inversely. In FLUKA the heterogeneous foils were replaced by homogeneous foils and a userroutine was programmed that varies the thickness of the homogeneous foils for each simulated particle using this distribution. Results: Using the mathematical model and userroutine in FLUKA the broadening effect could be reproduced exactly when replacing the heterogeneous foils by homogeneous ones. The computation time was reduced by 90 percent. Conclusion: In this study the broadening effect on the Bragg Peak due to heterogeneous structures was analyzed, described by a mathematical model and implemented in FLUKA via userroutines. Applying these routines the computing time was reduced by 90 percent. The developed tool can be used for any heterogeneous structure in the dimensions of microns to millimeters, in principle even for organic materials like lung tissue.},
doi = {10.1118/1.4924482},
journal = {Medical Physics},
issn = {00942405},
number = 6,
volume = 42,
place = {United States},
year = {2015},
month = {6}
}