Effect of transverse magnetic fields on a simulated in-line 6 MV linac.
Identifieur interne : 000D72 ( Main/Exploration ); précédent : 000D71; suivant : 000D73Effect of transverse magnetic fields on a simulated in-line 6 MV linac.
Auteurs : J. St Aubin [Canada] ; S. Steciw ; B G FalloneSource :
- Physics in medicine and biology ; 2010.
English descriptors
- KwdEn :
- MESH :
- instrumentation : Magnetics, Particle Accelerators.
- methods : Magnetics, Radiotherapy.
- therapy : Neoplasms.
- Computer Simulation, Electrons, Humans, Models, Statistical, Monte Carlo Method, Motion, Reproducibility of Results, Scattering, Radiation.
Abstract
The effects of a transverse magnetic field on an in-line side-coupled 6 MV linear accelerator are given. The results are directly applicable to a linac-MR system used for real-time image guided adaptive radiotherapy. Our previously designed end-to-end linac simulation incorporated the results from the axisymmetric 2D electron gun program EGN2w. However, since the magnetic fields being investigated are non-axisymmetric in nature for the work presented here, the electron gun simulation was performed using OPERA-3d/SCALA. The simulation results from OPERA-3d/SCALA showed excellent agreement with previous results. Upon the addition of external magnetic fields to our fully 3D linac simulation, it was found that a transverse magnetic field of 6 G resulted in a 45 +/- 1% beam loss, and by 14 G, no electrons were incident on the target. Transverse magnetic fields on the linac simulation produced a highly asymmetric focal spot at the target, which translated into a 13% profile asymmetry at 6 G. Upon translating the focal spot with respect to the target coordinates, profile symmetry was regained at the expense of a lateral shift in the dose profiles. It was found that all points in the penumbra failed a 1%/1 mm acceptance criterion for fields between 4 and 6 G. However, it was also found that the lateral profile shifts were corrected by adjusting the jaw positions asymmetrically.
DOI: 10.1088/0031-9155/55/16/015
PubMed: 20679699
Affiliations:
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Le document en format XML
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Steciw</name></author><author><name sortKey="Fallone, B G" sort="Fallone, B G" uniqKey="Fallone B" first="B G" last="Fallone">B G Fallone</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="2010">2010</date><idno type="doi">10.1088/0031-9155/55/16/015</idno><idno type="RBID">pubmed:20679699</idno><idno type="pmid">20679699</idno><idno type="wicri:Area/PubMed/Corpus">000353</idno><idno type="wicri:Area/PubMed/Curation">000353</idno><idno type="wicri:Area/PubMed/Checkpoint">000351</idno><idno type="wicri:Area/Ncbi/Merge">000716</idno><idno type="wicri:Area/Ncbi/Curation">000716</idno><idno type="wicri:Area/Ncbi/Checkpoint">000716</idno><idno type="wicri:Area/Main/Merge">000D80</idno><idno type="wicri:Area/Main/Curation">000D72</idno><idno type="wicri:Area/Main/Exploration">000D72</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Effect of transverse magnetic fields on a simulated in-line 6 MV linac.</title><author><name sortKey="St Aubin, J" sort="St Aubin, J" uniqKey="St Aubin J" first="J" last="St Aubin">J. St Aubin</name><affiliation wicri:level="1"><nlm:affiliation>Department of Physics, University of Alberta, 11322-89th Avenue, Edmonton, Alberta T6G 2G7, Canada.</nlm:affiliation><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Physics, University of Alberta, 11322-89th Avenue, Edmonton, Alberta T6G 2G7</wicri:regionArea><wicri:noRegion>Alberta T6G 2G7</wicri:noRegion></affiliation></author><author><name sortKey="Steciw, S" sort="Steciw, S" uniqKey="Steciw S" first="S" last="Steciw">S. Steciw</name></author><author><name sortKey="Fallone, B G" sort="Fallone, B G" uniqKey="Fallone B" first="B G" last="Fallone">B G Fallone</name></author></analytic><series><title level="j">Physics in medicine and biology</title><idno type="e-ISSN">1361-6560</idno><imprint><date when="2010" type="published">2010</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Computer Simulation</term><term>Electrons</term><term>Humans</term><term>Magnetics (instrumentation)</term><term>Magnetics (methods)</term><term>Models, Statistical</term><term>Monte Carlo Method</term><term>Motion</term><term>Neoplasms (therapy)</term><term>Particle Accelerators (instrumentation)</term><term>Radiotherapy (methods)</term><term>Reproducibility of Results</term><term>Scattering, Radiation</term></keywords><keywords scheme="MESH" qualifier="instrumentation" xml:lang="en"><term>Magnetics</term><term>Particle Accelerators</term></keywords><keywords scheme="MESH" qualifier="methods" xml:lang="en"><term>Magnetics</term><term>Radiotherapy</term></keywords><keywords scheme="MESH" qualifier="therapy" xml:lang="en"><term>Neoplasms</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Computer Simulation</term><term>Electrons</term><term>Humans</term><term>Models, Statistical</term><term>Monte Carlo Method</term><term>Motion</term><term>Reproducibility of Results</term><term>Scattering, Radiation</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The effects of a transverse magnetic field on an in-line side-coupled 6 MV linear accelerator are given. The results are directly applicable to a linac-MR system used for real-time image guided adaptive radiotherapy. Our previously designed end-to-end linac simulation incorporated the results from the axisymmetric 2D electron gun program EGN2w. However, since the magnetic fields being investigated are non-axisymmetric in nature for the work presented here, the electron gun simulation was performed using OPERA-3d/SCALA. The simulation results from OPERA-3d/SCALA showed excellent agreement with previous results. Upon the addition of external magnetic fields to our fully 3D linac simulation, it was found that a transverse magnetic field of 6 G resulted in a 45 +/- 1% beam loss, and by 14 G, no electrons were incident on the target. Transverse magnetic fields on the linac simulation produced a highly asymmetric focal spot at the target, which translated into a 13% profile asymmetry at 6 G. Upon translating the focal spot with respect to the target coordinates, profile symmetry was regained at the expense of a lateral shift in the dose profiles. It was found that all points in the penumbra failed a 1%/1 mm acceptance criterion for fields between 4 and 6 G. However, it was also found that the lateral profile shifts were corrected by adjusting the jaw positions asymmetrically.</div></front></TEI><affiliations><list><country><li>Canada</li></country></list><tree><noCountry><name sortKey="Fallone, B G" sort="Fallone, B G" uniqKey="Fallone B" first="B G" last="Fallone">B G Fallone</name><name sortKey="Steciw, S" sort="Steciw, S" uniqKey="Steciw S" first="S" last="Steciw">S. Steciw</name></noCountry><country name="Canada"><noRegion><name sortKey="St Aubin, J" sort="St Aubin, J" uniqKey="St Aubin J" first="J" last="St Aubin">J. St Aubin</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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