1
|
Laakkonen L, Lehtomäki J, Cahill A, Constantin M, Kulmala A, Harju A. Monte Carlo modeling of Halcyon and Ethos radiotherapy beam using CAD geometry: validation and IAEA-compliant phase space. Phys Med Biol 2023; 68. [PMID: 36657172 DOI: 10.1088/1361-6560/acb4d9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Accepted: 01/19/2023] [Indexed: 01/20/2023]
Abstract
Objective.A Monte Carlo (MC) model of a Halcyon and Ethos (Varian Medical Systems, a Siemens Healthineers Company) radiotherapy beam was validated and field-independent phase space (PHSP) files were recorded above the dual-layer multileaf collimators (MLC).Approach.The treatment head geometry was modeled according to engineering drawings and the dual-layer MLC was imported from CAD (computer-aided design) files. The information for the incident electron beam was achieved from an iterative electromagnetic solver. The validation of the model was performed by comparing the dose delivered by the square MLC fields as well as complex field measurements.Main results.An electron phase space was generated from linac simulations and achieved improved MC results. The output factors for square fields were within 1% and the largest differences of 5% were found in the build-up region of PDDs and the penumbra region of profiles. With the more complicated MLC-shaped field (Fishbone), the largest differences of up to 8% were found in the MLC leaf tip region due to the uncertainty of the MLC positioning and the mechanical leaf gap value. The impact of the collimator rotation on the PHSP solution has been assessed with both small and large fields, confirming negligible effects on in-field and out-of-field dose distributions.Significance.A computational model of the Halcyon and Ethos radiotherapy beam with a high accuracy implementation of the MLC was shown to be able to reproduce the radiation beam characteristics with square fields and more complex MLC-shaped fields. The field-independent PHSP files that were produced can be used as an accurate treatment head model above the MLC, and reduce the time to simulate particle transport through treatment head components.
Collapse
Affiliation(s)
- Linda Laakkonen
- Varian Medical Systems, a Siemens Healthineers Company, Helsinki, Finland.,Department of Physics, University of Helsinki, Finland
| | - Jouko Lehtomäki
- Varian Medical Systems, a Siemens Healthineers Company, Helsinki, Finland
| | - Alexander Cahill
- Varian Medical Systems, a Siemens Healthineers Company, Helsinki, Finland
| | | | - Antti Kulmala
- Clinical Research Institute HUCH Ltd., Helsinki, Finland
| | - Ari Harju
- Varian Medical Systems, a Siemens Healthineers Company, Helsinki, Finland
| |
Collapse
|
2
|
Kandlakunta P, Momin S, Sloop A, Zhang T, Khan R. Characterizing a Geant4 Monte Carlo model of a multileaf collimator for a TrueBeam™ linear accelerator. Phys Med 2019; 59:1-12. [PMID: 30928056 DOI: 10.1016/j.ejmp.2019.02.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 02/11/2019] [Accepted: 02/12/2019] [Indexed: 11/26/2022] Open
Abstract
PURPOSE The purpose of this work was to develop and validate a multileaf collimator (MLC) model for a TrueBeam™ linac using Geant4 Monte Carlo (MC) simulation kit. METHODS A Geant4 application was developed to accurately represent TrueBeam™ linac. Pre-computed phase-space file in a plane just above the jaws was used for radiation transport. A Varian 120 leaf Millennium™ MLC was modeled using geometry and material specifications provided by the manufacturer using Geant4 constructs. Leaf characteristics e.g. tongue-groove design, variable thickness, interleaf gap were simulated. The linac model was validated by comparing simulated dose profiles and depth-doses with experimental data using an ionization chamber in water. Dosimetric characteristics of the MLC such as inter- and intra-leaf leakage, penumbra effect, MLC leaf positioning, and dynamic characteristics were also investigated. RESULTS For the depth dose curves, 99% of the calculated data points agree within 1% of the experimental values for the 4 × 4 cm2 and 10 × 10 cm2 and within 2% of the experimental values for 20 × 20, 30 × 30 and 40 × 40 cm2 jaw defined fields. The cross-plane dose profiles show agreement <2% for depths up to 10 cm and to within 4% beyond 10 cm. MLC dosimetric characterization with MC agree well with film measurements. The rounded leaf penumbra remained constant throughout the range of leaf motion. CONCLUSIONS The TrueBeam™ linac equipped with 120-leaf MLC was successfully modeled using Geant4. The accuracy of the model was verified by comparing the simulations with experiments. The model may be utilized for independent dose verification and QA of IMRT.
Collapse
Affiliation(s)
- Praneeth Kandlakunta
- Department of Radiation Oncology, Washington University in St. Louis School of Medicine, St Louis, MO, USA
| | - Shadab Momin
- Department of Radiation Oncology, Washington University in St. Louis School of Medicine, St Louis, MO, USA
| | - Austin Sloop
- Department of Radiation Oncology, Washington University in St. Louis School of Medicine, St Louis, MO, USA
| | - Tiezhi Zhang
- Department of Radiation Oncology, Washington University in St. Louis School of Medicine, St Louis, MO, USA
| | - Rao Khan
- Department of Radiation Oncology, Washington University in St. Louis School of Medicine, St Louis, MO, USA.
| |
Collapse
|
3
|
Milluzzo G, Pipek J, Amico AG, Cirrone GAP, Cuttone G, Korn G, Larosa G, Leanza R, Margarone D, Petringa G, Russo A, Schillaci F, Scuderi V, Romano F. Transversal dose distribution optimization for laser-accelerated proton beam medical applications by means of Geant4. Phys Med 2018; 54:166-172. [PMID: 30076107 DOI: 10.1016/j.ejmp.2018.07.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 07/03/2018] [Accepted: 07/21/2018] [Indexed: 11/25/2022] Open
Abstract
The main purpose of this paper is to quantitatively study the possibility of delivering dose distributions of clinical relevance with laser-driven proton beams. A Monte Carlo application has been developed with the Geant4 toolkit, simulating the ELIMED (MEDical and multidisciplinary application at ELI-Beamlines) transport and dosimetry beam line which is being currently installed at the ELI-Beamlines in Prague (CZ). The beam line will be used to perform irradiations for multidisciplinary studies, with the purpose of demonstrating the possible use of optically accelerated ion beams for therapeutic purposes. The ELIMED Geant4-based application, already validated against reference transport codes, accurately simulates each single element of the beam line, necessary to collect the accelerated beams and to select them in energy. Transversal dose distributions at the irradiation point have been studied and optimized to try to quantitatively answer the question if such kind of beam lines, and specifically the systems developed for ELIMED in Prague, will be actually able to transport ion beams not only for multidisciplinary applications, such as pitcher-catcher nuclear reactions (e.g. neutrons), PIXE analysis for cultural heritage and space radiation, but also for delivering dose patterns of clinical relevance in a future perspective of possible medical applications.
Collapse
Affiliation(s)
- G Milluzzo
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud, Via Santa Sofia 62, Catania, Italy; School of Mathematics and Physics, Queens University Belfast, United Kingdom; Physics and Astronomy Department, University of Catania, Via S. Sofia 64, Catania, Italy
| | - J Pipek
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud, Via Santa Sofia 62, Catania, Italy
| | - A G Amico
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud, Via Santa Sofia 62, Catania, Italy
| | - G A P Cirrone
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud, Via Santa Sofia 62, Catania, Italy
| | - G Cuttone
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud, Via Santa Sofia 62, Catania, Italy
| | - G Korn
- Institute of Physics ASCR, v.v.i (FZU), ELI-Beamlines Project, 182 21 Prague, Czech Republic
| | - G Larosa
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud, Via Santa Sofia 62, Catania, Italy
| | - R Leanza
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud, Via Santa Sofia 62, Catania, Italy; Physics and Astronomy Department, University of Catania, Via S. Sofia 64, Catania, Italy
| | - D Margarone
- Institute of Physics ASCR, v.v.i (FZU), ELI-Beamlines Project, 182 21 Prague, Czech Republic
| | - G Petringa
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud, Via Santa Sofia 62, Catania, Italy; Physics and Astronomy Department, University of Catania, Via S. Sofia 64, Catania, Italy
| | - A Russo
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud, Via Santa Sofia 62, Catania, Italy
| | - F Schillaci
- Physics and Astronomy Department, University of Catania, Via S. Sofia 64, Catania, Italy; Institute of Physics ASCR, v.v.i (FZU), ELI-Beamlines Project, 182 21 Prague, Czech Republic
| | - V Scuderi
- Institute of Physics ASCR, v.v.i (FZU), ELI-Beamlines Project, 182 21 Prague, Czech Republic; Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud, Via Santa Sofia 62, Catania, Italy
| | - F Romano
- National Physical Laboratory, CMES - Medical Radiation Science Hampton Road, Teddington, Middlesex, TW11 0LW UK; Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud, Via Santa Sofia 62, Catania, Italy.
| |
Collapse
|
4
|
Miras H, Jiménez R, Perales Á, Terrón JA, Bertolet A, Ortiz A, Macías J. Monte Carlo verification of radiotherapy treatments with CloudMC. Radiat Oncol 2018; 13:99. [PMID: 29945681 PMCID: PMC6020449 DOI: 10.1186/s13014-018-1051-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 05/20/2018] [Indexed: 11/30/2022] Open
Abstract
Background A new implementation has been made on CloudMC, a cloud-based platform presented in a previous work, in order to provide services for radiotherapy treatment verification by means of Monte Carlo in a fast, easy and economical way. A description of the architecture of the application and the new developments implemented is presented together with the results of the tests carried out to validate its performance. Methods CloudMC has been developed over Microsoft Azure cloud. It is based on a map/reduce implementation for Monte Carlo calculations distribution over a dynamic cluster of virtual machines in order to reduce calculation time. CloudMC has been updated with new methods to read and process the information related to radiotherapy treatment verification: CT image set, treatment plan, structures and dose distribution files in DICOM format. Some tests have been designed in order to determine, for the different tasks, the most suitable type of virtual machines from those available in Azure. Finally, the performance of Monte Carlo verification in CloudMC is studied through three real cases that involve different treatment techniques, linac models and Monte Carlo codes. Results Considering computational and economic factors, D1_v2 and G1 virtual machines were selected as the default type for the Worker Roles and the Reducer Role respectively. Calculation times up to 33 min and costs of 16 € were achieved for the verification cases presented when a statistical uncertainty below 2% (2σ) was required. The costs were reduced to 3–6 € when uncertainty requirements are relaxed to 4%. Conclusions Advantages like high computational power, scalability, easy access and pay-per-usage model, make Monte Carlo cloud-based solutions, like the one presented in this work, an important step forward to solve the long-lived problem of truly introducing the Monte Carlo algorithms in the daily routine of the radiotherapy planning process.
Collapse
Affiliation(s)
- Hector Miras
- Department of Medical Physics, Hospital Universitario Virgen Macarena, Av. Doctor Fedriani 3, 41009, Seville, Spain. .,Biomedicine Institute of Seville (IBiS), Antonio Maura Montaner, 41013, Seville, Spain.
| | - Rubén Jiménez
- R&D Division, Icinetic TIC SL, Av. Eduardo Dato 69, 41005, Seville, Spain
| | - Álvaro Perales
- Atomic, Molecular and Nuclear Physics Department, Universidad de Sevilla, Av. Reina Mercedes s/n, 41012, Seville, Spain
| | - José Antonio Terrón
- Department of Medical Physics, Hospital Universitario Virgen Macarena, Av. Doctor Fedriani 3, 41009, Seville, Spain.,Biomedicine Institute of Seville (IBiS), Antonio Maura Montaner, 41013, Seville, Spain
| | - Alejandro Bertolet
- Department of Medical Physics, Hospital Universitario Virgen Macarena, Av. Doctor Fedriani 3, 41009, Seville, Spain
| | - Antonio Ortiz
- Department of Medical Physics, Hospital Universitario Virgen Macarena, Av. Doctor Fedriani 3, 41009, Seville, Spain
| | - José Macías
- Department of Medical Physics, Hospital Universitario Virgen Macarena, Av. Doctor Fedriani 3, 41009, Seville, Spain
| |
Collapse
|
5
|
1st European Congress of Medical Physics September 1-4, 2016; Medical Physics innovation and vision within Europe and beyond. Phys Med 2017; 41:1-4. [PMID: 28709862 DOI: 10.1016/j.ejmp.2017.07.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Accepted: 07/04/2017] [Indexed: 11/20/2022] Open
Abstract
Medical Physics is the scientific healthcare profession concerned with the application of the concepts and methods of physics in medicine. The European Federation of Organisations for Medical Physics (EFOMP) acts as the umbrella organization for European Medical Physics societies. Due to the rapid advancements in related scientific fields, medical physicists must have continuous education through workshops, training courses, conferences, and congresses during their professional life. The latest developments related to this increasingly significant medical speciality were presented during the 1st European Congress of Medical Physics 2016, held in Athens, September 1-4, 2016, organized by EFOMP, hosted by the Hellenic Association of Medical Physicists (HAMP), and summarized in the current volume.
Collapse
|