Simulation of realistic linac motion improves the accuracy of a Monte Carlo based VMAT plan QA system
Abstract Purpose To investigate the use of a software-based pre-treatment QA system for VMAT, which incorporates realistic linac motion during delivery. Methods A beam model was produced using the GATE platform for GEANT4 Monte Carlo dose calculations. Initially validated against static measurements...
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Published in | Radiotherapy and oncology Vol. 109; no. 3; pp. 377 - 383 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
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Elsevier Ireland Ltd
01.12.2013
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Abstract | Abstract Purpose To investigate the use of a software-based pre-treatment QA system for VMAT, which incorporates realistic linac motion during delivery. Methods A beam model was produced using the GATE platform for GEANT4 Monte Carlo dose calculations. Initially validated against static measurements, the model was then integrated with a VMAT delivery emulator, which reads plan files and generates a set of dynamic delivery instructions analogous to the linac control system. Monte Carlo simulations were compared to measurements on dosimetric phantoms for prostate and head and neck VMAT plans. Comparisons were made between calculations using fixed control points, and simulations of continuous motion utilising the emulator. For routine use, the model was incorporated into an automated pre-treatment QA system. Results The model showed better agreement with measurements when incorporating linac motion: mean gamma pass ( Γ < 1) over 5 prostate plans was 100.0% at 3%/3 mm and 97.4% at 2%/2 mm when compared to measurement. For the head and neck plans, delivered to the anatomical phantom, gamma passes were 99.4% at 4%/4 mm and 94.94% at 3%/3 mm. For example simulations within patient CT data, gamma passes were observed which are within our centre’s tolerance for pre-treatment QA. Conclusions Through comparison to phantom measurements, it was found that the incorporation of a realistic linac motion improves the accuracy of the model compared to the simulation of fixed control points. The ability to accurately calculate dose as a second check of the planning system, and determine realistic delivery characteristics, may allow for the reduction of machine-based pre-treatment plan QA for VMAT. |
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AbstractList | To investigate the use of a software-based pre-treatment QA system for VMAT, which incorporates realistic linac motion during delivery.
A beam model was produced using the GATE platform for GEANT4 Monte Carlo dose calculations. Initially validated against static measurements, the model was then integrated with a VMAT delivery emulator, which reads plan files and generates a set of dynamic delivery instructions analogous to the linac control system. Monte Carlo simulations were compared to measurements on dosimetric phantoms for prostate and head and neck VMAT plans. Comparisons were made between calculations using fixed control points, and simulations of continuous motion utilising the emulator. For routine use, the model was incorporated into an automated pre-treatment QA system.
The model showed better agreement with measurements when incorporating linac motion: mean gamma pass (Γ<1) over 5 prostate plans was 100.0% at 3%/3mm and 97.4% at 2%/2mm when compared to measurement. For the head and neck plans, delivered to the anatomical phantom, gamma passes were 99.4% at 4%/4mm and 94.94% at 3%/3mm. For example simulations within patient CT data, gamma passes were observed which are within our centre's tolerance for pre-treatment QA.
Through comparison to phantom measurements, it was found that the incorporation of a realistic linac motion improves the accuracy of the model compared to the simulation of fixed control points. The ability to accurately calculate dose as a second check of the planning system, and determine realistic delivery characteristics, may allow for the reduction of machine-based pre-treatment plan QA for VMAT. PURPOSETo investigate the use of a software-based pre-treatment QA system for VMAT, which incorporates realistic linac motion during delivery.METHODSA beam model was produced using the GATE platform for GEANT4 Monte Carlo dose calculations. Initially validated against static measurements, the model was then integrated with a VMAT delivery emulator, which reads plan files and generates a set of dynamic delivery instructions analogous to the linac control system. Monte Carlo simulations were compared to measurements on dosimetric phantoms for prostate and head and neck VMAT plans. Comparisons were made between calculations using fixed control points, and simulations of continuous motion utilising the emulator. For routine use, the model was incorporated into an automated pre-treatment QA system.RESULTSThe model showed better agreement with measurements when incorporating linac motion: mean gamma pass (Γ<1) over 5 prostate plans was 100.0% at 3%/3mm and 97.4% at 2%/2mm when compared to measurement. For the head and neck plans, delivered to the anatomical phantom, gamma passes were 99.4% at 4%/4mm and 94.94% at 3%/3mm. For example simulations within patient CT data, gamma passes were observed which are within our centre's tolerance for pre-treatment QA.CONCLUSIONSThrough comparison to phantom measurements, it was found that the incorporation of a realistic linac motion improves the accuracy of the model compared to the simulation of fixed control points. The ability to accurately calculate dose as a second check of the planning system, and determine realistic delivery characteristics, may allow for the reduction of machine-based pre-treatment plan QA for VMAT. Abstract Purpose To investigate the use of a software-based pre-treatment QA system for VMAT, which incorporates realistic linac motion during delivery. Methods A beam model was produced using the GATE platform for GEANT4 Monte Carlo dose calculations. Initially validated against static measurements, the model was then integrated with a VMAT delivery emulator, which reads plan files and generates a set of dynamic delivery instructions analogous to the linac control system. Monte Carlo simulations were compared to measurements on dosimetric phantoms for prostate and head and neck VMAT plans. Comparisons were made between calculations using fixed control points, and simulations of continuous motion utilising the emulator. For routine use, the model was incorporated into an automated pre-treatment QA system. Results The model showed better agreement with measurements when incorporating linac motion: mean gamma pass ( Γ < 1) over 5 prostate plans was 100.0% at 3%/3 mm and 97.4% at 2%/2 mm when compared to measurement. For the head and neck plans, delivered to the anatomical phantom, gamma passes were 99.4% at 4%/4 mm and 94.94% at 3%/3 mm. For example simulations within patient CT data, gamma passes were observed which are within our centre’s tolerance for pre-treatment QA. Conclusions Through comparison to phantom measurements, it was found that the incorporation of a realistic linac motion improves the accuracy of the model compared to the simulation of fixed control points. The ability to accurately calculate dose as a second check of the planning system, and determine realistic delivery characteristics, may allow for the reduction of machine-based pre-treatment plan QA for VMAT. |
Author | Aitkenhead, Adam H Rowbottom, Carl G Boylan, Christopher J Mackay, Ranald I |
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BackLink | https://www.ncbi.nlm.nih.gov/pubmed/24094628$$D View this record in MEDLINE/PubMed |
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CitedBy_id | crossref_primary_10_1038_s41598_022_10895_5 crossref_primary_10_1016_j_radonc_2015_11_008 crossref_primary_10_1088_1361_6560_ab0a8e crossref_primary_10_1371_journal_pone_0166767 crossref_primary_10_1016_j_phro_2018_03_002 crossref_primary_10_1016_j_radonc_2015_11_005 crossref_primary_10_1016_j_radonc_2013_11_007 crossref_primary_10_1016_j_ejmp_2017_03_001 |
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Snippet | Abstract Purpose To investigate the use of a software-based pre-treatment QA system for VMAT, which incorporates realistic linac motion during delivery.... To investigate the use of a software-based pre-treatment QA system for VMAT, which incorporates realistic linac motion during delivery. A beam model was... PURPOSETo investigate the use of a software-based pre-treatment QA system for VMAT, which incorporates realistic linac motion during delivery.METHODSA beam... |
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SubjectTerms | Computer Simulation Head and Neck Neoplasms - radiotherapy Hematology, Oncology and Palliative Medicine Humans Male Monte Carlo Monte Carlo Method Particle Accelerators Phantoms, Imaging Prostatic Neoplasms - radiotherapy Quality assurance Quality Assurance, Health Care Radiometry - methods Radiotherapy Dosage Radiotherapy Planning, Computer-Assisted - methods Reproducibility of Results Software Treatment verification VMAT |
Title | Simulation of realistic linac motion improves the accuracy of a Monte Carlo based VMAT plan QA system |
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