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Ian C. Smith 1 A portal-based system for quality assurance of radiotherapy treatment plans using Grid-enabled High Performance Computing clusters CR Baker 2, V Panettieri 3, C Addison 1, AE Nahum 3 1 Computing Services Dept, University of Liverpool; 2 Directorate of Medical Imaging and Radiotherapy, University of Liverpool; 3 Physics Department, Clatterbridge Centre for Oncology
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Rationale MC codes can provide accurate absorbed dose calculations but are computationally demanding Desktop machines not powerful enough, need parallel hardware e.g. High Performance Computing (HPC) clusters Aim to exploit local and centrally funded HPC systems in a user- friendly manner Two MC codes have been investigated to date: MCNPX (beta v2.7a) Parallel (MPI-based) code General purpose transport code, tracks nearly all particles at nearly all energies (https://mcnpx.lanl.gov/).https://mcnpx.lanl.gov/ PENELOPE serial implementation general purpose MC code implemented as a set of FORTRAN routines coupled electron-photon transport from 50 eV to 1 GeV in arbitrary materials and complex geometries [1]. [1] Salvat F, Fernández-Varea JM, Sempau J. PENELOPE, a code system for Monte Carlo simulation of electron and photon transport. France: OECD Nuclear Energy Agency, Issy-les-Moulineaux; 2008. ISBN 9264023011. Available in pdf format at: http://www.nea.fr.http://www.nea.fr
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Grid Computing Server / UL-GRID Portal
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Grid Computing Server / UL-GRID software stack
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MCNPX Job Submission
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PENELOPE Job Submission
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PENELOPE (serial code) workflows Rereasdasdas create random seeds for N input files using clonEasy[1] combine N individual phase-space files compute individual phase-space file create random seeds for N input files using clonEasy[1] stage-in phase-space file (only if necessary) compute partial treatment simulation results combine partial treatment simulation results using clonEasy[1] repeat for other patients phase-space file calculation patient treatment simulation Portal HPC cluster [1] Badal A and Sempau J 2006 A package of Linux scripts for the parallelization of Monte Carlo simulations Comput.Phys. Commun. 175 440–50
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External beam photon treatment modelled using PENELOPE Three 6 MV beams Resolution: 256 x 256 ( x 51 CT slices) Final average dose uncertainty 2% (2σ)
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MCNPX: Proton beam modelling 29 May 2009 Clatterbridge proton facility Baker, Quine, Brunt and Kacperek (2009) Applied Radiation and Isotopes 67; 3:402 Protons transported through the beam-line (scattering system, range-shifters, modulators and collimators). ~2m Incident spectrum fitted to measured Bragg peak Generic phase-space file generated at the position of the modulator and subsequently transported through patient-specific range-shifter and modulator
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29 May 2009 2.5cm diameter beam, full energy (~60 MeV at patient, ~3.2 cm range in water) 500 million histories 0.5x0.5x5 mm voxels 50keV proton cut-off <1% statistical uncertainty in absorbed dose in high dose region (1 ) Bragg peak Half-modulation Proton absorbed dose in water
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Timing Results PENELOPE (Serial) Phase-space file calculation 4 days per beam on 7 cores 700 x 10 6 particles per file Patient calculation 1 simulation required 4 days on 1 core 1 simulation on 32 cores should only require 3 hours MCNPX (Parallel under MPI) 500 million histories over 32 cores, < 4 hours, without variance reduction applied.
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Future Directions Expand portal interface to include submission of job workflows Provide support for BEAM [1] and DOSxyz [3] (based on the EGSnrc MC code [2] ) Possible use of Windows Condor Pool to create PSFs for PENELOPE References: [1] 23D. W. Rogers, B. Faddegon, G. X. Ding, C. M. Ma, J. Wei, and T. Mackie, “BEAM: A Monte Carlo code to simulate radiotherapy treatment units,” Med. Phys. 22, 503–524 _1995_. [2] Kawrakow and D. W. O. Rogers. The EGSnrc Code System: Monte Carlo simulation of electron and photon transport. Technical Report PIRS-701 (4th printing), National Research Council of Canada, Ottawa, Canada, 2003. [3] Walters B, Kawrakow I and Rogers D W O 2007 DOSXYZnrc Users Manual Report PIRS 794 (Ottawa: National Research Council of Canada)
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