Effect of transverse magnetic fields on a simulated in-line 6 MV linac
Identifieur interne : 000E31 ( Main/Exploration ); précédent : 000E30; suivant : 000E32Effect of transverse magnetic fields on a simulated in-line 6 MV linac
Auteurs : J. St Aubin [Canada] ; S. Steciw [Canada] ; B G Fallone [Canada]Source :
- Physics in Medicine and Biology [ 0031-9155 ] ; 2010.
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 linacMR 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.
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The results are directly applicable to a linacMR 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><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><name sortKey="Fallone, B G" sort="Fallone, B G" uniqKey="Fallone B" first="B G" last="Fallone">B G Fallone</name><name sortKey="Fallone, B G" sort="Fallone, B G" uniqKey="Fallone B" first="B G" last="Fallone">B G Fallone</name><name sortKey="Fallone, B G" sort="Fallone, B G" uniqKey="Fallone B" first="B G" last="Fallone">B G Fallone</name><name sortKey="St Aubin, J" sort="St Aubin, J" uniqKey="St Aubin J" first="J" last="St Aubin">J. St Aubin</name><name sortKey="Steciw, S" sort="Steciw, S" uniqKey="Steciw S" first="S" last="Steciw">S. Steciw</name><name sortKey="Steciw, S" sort="Steciw, S" uniqKey="Steciw S" first="S" last="Steciw">S. Steciw</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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