scholarly journals Determination of kQmsr,Q0fmsr,fref factors for ion chambers used in the calibration of Leksell Gamma Knife Perfexion model using EGSnrc and PENELOPE Monte Carlo codes

2018 ◽  
Vol 45 (4) ◽  
pp. 1748-1757 ◽  
Author(s):  
Lalageh Mirzakhanian ◽  
Hamza Benmakhlouf ◽  
Frederic Tessier ◽  
Jan Seuntjens
Keyword(s):  
Monte Carlo ◽  
Gamma Knife ◽  
Ion Chambers ◽  
Gamma Knife Perfexion

Monte carlo determination of correction factors for dosimetric measurements in gamma knife perfexion small fields

2016 ◽  
Vol 32 ◽  
pp. 237 ◽  
Author(s):  
E. Zoros ◽  
E.P. Pappas ◽  
A. Moutsatsos ◽  
E. Pantelis ◽  
C. Paraskevopoulou ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Gamma Knife ◽  
Correction Factors ◽  
Small Fields ◽  
Gamma Knife Perfexion

An Effective Method of Simulation for the Leksell Gamma Knife Perfexion by Rotating Particles in the Phase Space File

2020 ◽  
Vol 65 (1) ◽  
pp. 54-58
Author(s):  
T. Medjadj ◽  
A. Ksenofontov ◽  
A. Dalechina
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Phase Space ◽  
Gamma Knife ◽  
Homogeneous Medium ◽  
Planning System ◽  
Monte Carlo Code ◽  
Output Factors ◽  
Gamma Knife Perfexion ◽  
Conical Form

Purpose: To develop an effective method of Monte Carlo simulation of the GammaKnife Perfexion system by rotating particles in the phase space file (PSF). This method does not require simulating of all 192 sources that are distributed in the conical form of the Perfexion collimator. The simulation was performed only for 5 out of 192 sources for each collimator size. Material and methods: Monte Carlo simulation of dose distribution for previous models of GammaKnife system requires phase space file for only one source, since this phase space is identical for all the 201 sources. The Perfexion model is more complex due to the non-coaxial positions of the sources and the complexity of the collimator system itself. In this work, we present an effective method to simulate the Perfexion model using a phase space file. Penelope Monte Carlo code was used to perform this simulation. In this method, the PSF was obtained for one source in each ring, resulting in five files for each collimator size. PSF for other sources were created by azimuthal redistribution of particles, in the obtained PSF, by rotation around the Z-axis. The phase space files of the same ring were then stored together in a single file. Results: The paper presented MC simulation using the azimuthal redistribution of particles in the phase space file by rotation around the Z-axis. The simulation has been validated comparing the dose profiles and output factors with the data of the algorithm TMR10 planning system Leksell Gamma Plan (LGP) in a homogeneous environment. The acceptance criterion between TMR10 and Monte Carlo calculations for the profiles was based on the gamma index (GI). Index values more than one were not detected in all cases, which indicates a good agreement of results. The differences between the output factors obtained in this work and the TMR10 data for collimators 8 mm and 4 mm are 0.74 and 0.73 %, respectively. Conclusion: In this work successfully implemented an effective method of simulating the Leksell Gamma knife Perfexion system. The presented method does not require modeling for all 192 sources distributed in the conical form of the Perfexion collimator. The simulation was performed for only five sources for each collimator and their files PSF were obtained. These files were used to create the PSF files for other sources by azimuthal redistribution of particles, in these files, by rotation around the Z-axis providing correct calculations of dose distributions in a homogeneous medium for 16, 8 and 4 mm collimators.

scholarly journals EP-1438: Experimental determination of correction factors for reference dosimetry in Gamma Knife Perfexion

2017 ◽  
Vol 123 ◽  
pp. S767 ◽  
Author(s):  
E. Zoros ◽  
E.P. Pappas ◽  
K. Zourari ◽  
E. Pantelis ◽  
A. Moutsatsos ◽  
...  
Keyword(s):  
Experimental Determination ◽  
Gamma Knife ◽  
Correction Factors ◽  
Gamma Knife Perfexion

SU-E-T-468: Gamma Knife Perfexion Dosimetry: A Monte Carlo Model of One Sector

2012 ◽  
Vol 39 (6Part17) ◽  
pp. 3812-3813 ◽  
Author(s):  
R Best ◽  
J Gersh ◽  
D Wiant ◽  
J Bourland
Keyword(s):  
Monte Carlo ◽  
Gamma Knife ◽  
Monte Carlo Model ◽  
Gamma Knife Perfexion

scholarly journals Development of a Monte Carlo model for treatment planning dose verification of the Leksell Gamma Knife Perfexion radiosurgery system

2016 ◽  
Vol 17 (4) ◽  
pp. 190-201 ◽  
Author(s):  
Jiankui Yuan ◽  
Simon S. Lo ◽  
Yiran Zheng ◽  
Jason W. Sohn ◽  
Andrew E. Sloan ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Treatment Planning ◽  
Gamma Knife ◽  
Monte Carlo Model ◽  
Dose Verification ◽  
Gamma Knife Perfexion
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