Publication:
Auto-commissioning of a Monte Carlo electron beam model with application to photon MLC shaped electron fields.

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cris.virtual.author-orcid0000-0002-3911-3403
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cris.virtual.author-orcid0000-0002-9835-4362
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cris.virtualsource.author-orcidfb089609-c18a-4ab4-bf39-a2d95248a9a9
cris.virtualsource.author-orcidf062f5d8-d79b-4030-9490-a2e47daa852f
cris.virtualsource.author-orcidd6c194cc-efaa-430d-a786-2b336286a6c5
cris.virtualsource.author-orcid04be9425-5745-4273-a7a2-4a944051185b
cris.virtualsource.author-orciddf328d5c-9683-459d-a247-d6201611f681
cris.virtualsource.author-orcid89463473-3fae-4697-aa8a-c8ff410d30cb
cris.virtualsource.author-orcidc171715f-9c9f-4166-9093-7f89b4d6ffe9
dc.contributor.authorFix, Michael
dc.contributor.authorFrei, Daniel
dc.contributor.authorMüller, Silvan Andreas
dc.contributor.authorGuyer, Gian Mauro Carlo
dc.contributor.authorLöbner, Hannes Anton
dc.contributor.authorVolken, Werner
dc.contributor.authorManser, Peter
dc.date.accessioned2024-10-15T09:39:46Z
dc.date.available2024-10-15T09:39:46Z
dc.date.issued2023-02-17
dc.description.abstractOBJECTIVE Presently electron beam treatments are delivered using dedicated applicators. An alternative is the usage of the already installed photon multileaf collimator (pMLC) enabling efficient electron treatments. Currently, the commissioning of beam models is a manual and time-consuming process. In this work an auto-commissioning procedure for the Monte Carlo (MC) beam model part representing the beam above the pMLC is developed for TrueBeam systems with electron energies from 6 to 22 MeV. APPROACH The analytical part of the electron beam model includes a main source representing the primary beam and a jaw source representing the head scatter contribution each consisting of an electron and a photon component, while MC radiation transport is performed for the pMLC. The auto-commissioning of this analytical part relies on information pre-determined from MC simulations, in-air dose profiles and absolute dose measurements in water for different field sizes and source to surface distances (SSDs). For validation calculated and measured dose distributions in water were compared for different field sizes, SSDs and beam energies for eight TrueBeam systems. Furthermore, a sternum case in an anthropomorphic phantom was considered and calculated and measured dose distributions were compared at different SSDs. MAIN RESULTS Instead of the manual commissioning taking up to several days of calculation time and several hours of user time, the auto-commissioning is carried out in a few minutes. Measured and calculated dose distributions agree generally within 3% of maximum dose or 2 mm. The gamma passing rates for the sternum case ranged from 96% to 99% (3% (global)/2 mm criteria, 10% threshold). SIGNIFICANCE The auto-commissioning procedure was successfully implemented and applied to eight TrueBeam systems. The newly developed user-friendly auto-commissioning procedure allows an efficient commissioning of an MC electron beam model and eases the usage of advanced electron radiotherapy utilizing the pMLC for beam shaping.
dc.description.sponsorshipUniversitätsklinik für Radio-Onkologie - Medizinische Strahlenphysik
dc.description.sponsorshipUniversitätsklinik für Radio-Onkologie
dc.identifier.doi10.48350/178125
dc.identifier.pmid36716491
dc.identifier.publisherDOI10.1088/1361-6560/acb755
dc.identifier.urihttps://boris-portal.unibe.ch/handle/20.500.12422/121092
dc.language.isoen
dc.publisherInstitute of Physics Publishing IOP
dc.relation.ispartofPhysics in medicine and biology
dc.relation.issn0031-9155
dc.relation.organizationDCD5A442BAD6E17DE0405C82790C4DE2
dc.relation.organizationDCD5A442BAE6E17DE0405C82790C4DE2
dc.subjectMonte Carlo beam modelling dose calculation electron radiotherapy
dc.subject.ddc500 - Science::530 - Physics
dc.subject.ddc600 - Technology::610 - Medicine & health
dc.titleAuto-commissioning of a Monte Carlo electron beam model with application to photon MLC shaped electron fields.
dc.typearticle
dspace.entity.typePublication
dspace.file.typetext
oaire.citation.issue4
oaire.citation.volume68
oairecerif.author.affiliationUniversitätsklinik für Radio-Onkologie - Medizinische Strahlenphysik
oairecerif.author.affiliationUniversitätsklinik für Radio-Onkologie - Medizinische Strahlenphysik
oairecerif.author.affiliationUniversitätsklinik für Radio-Onkologie - Medizinische Strahlenphysik
oairecerif.author.affiliationUniversitätsklinik für Radio-Onkologie - Medizinische Strahlenphysik
oairecerif.author.affiliationUniversitätsklinik für Radio-Onkologie
oairecerif.author.affiliationUniversitätsklinik für Radio-Onkologie - Medizinische Strahlenphysik
oairecerif.author.affiliationUniversitätsklinik für Radio-Onkologie - Medizinische Strahlenphysik
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unibe.contributor.rolecreator
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unibe.date.licenseChanged2023-02-01 14:40:04
unibe.description.ispublishedpub
unibe.eprints.legacyId178125
unibe.journal.abbrevTitlePHYS MED BIOL
unibe.refereedTRUE
unibe.subtype.articlejournal

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