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dc.contributor.authorBudgell, Geoff J
dc.contributor.authorSykes, Jonathan R
dc.contributor.authorWilkinson, John M
dc.date.accessioned2010-02-12T12:21:06Z
dc.date.available2010-02-12T12:21:06Z
dc.date.issued1998-10
dc.identifier.citationRectangular edge synchronization for intensity modulated radiation therapy with dynamic multileaf collimation. 1998, 43 (10):2769-84 Phys Med Biolen
dc.identifier.issn0031-9155
dc.identifier.pmid9814516
dc.identifier.doi10.1088/0031-9155/43/10/007
dc.identifier.urihttp://hdl.handle.net/10541/91972
dc.description.abstractThe implementation of intensity modulated radiotherapy by dynamic multileaf collimator control involves the use of interpreter software which creates leaf trajectory plans for each leaf pair. Interpreter software for use with an Elekta SL15 linear accelerator and dedicated multileaf collimator has been written and tested. In practice the ideal trajectory plans often predict contact between leaves from opposing leaf banks, but this is prohibited by control software on the Elekta system as it could lead to mechanical damage. If the modulation within the geometric limits of a shaped field is not to be compromised then strategies to avoid leaf contact result in additional unwanted doses outside the geometric edge. The magnitude of any such additional dose can be reduced to acceptable levels by a technique which we have called rectangular edge synchronization. The performance of interpreter software which incorporates rectangular edge synchronization has been compared with that of potentially more efficient software which does not. The option containing the rectangular edge synchronization algorithm was shown to work consistently well at high monitor unit rates, and without incurring leaf contacts, under a wide range of test conditions. It therefore provides a sound basis for using intensity modulation to replace mechanical wedges, to simulate customized patient shape compensators, or to implement the results of inverse treatment planning processes that require superimposed intensity modulated beams.
dc.language.isoenen
dc.subject.meshAlgorithms
dc.subject.meshComputer Simulation
dc.subject.meshFilm Dosimetry
dc.subject.meshParticle Accelerators
dc.subject.meshRadiometry
dc.subject.meshRadiotherapy
dc.subject.meshSoftware
dc.titleRectangular edge synchronization for intensity modulated radiation therapy with dynamic multileaf collimation.en
dc.typeArticleen
dc.contributor.departmentNorth Western Medical Physics, Christie Hospital NHS Trust, Manchester, UK. prsgjb@dalpha2.cr.man.ac.uken
dc.identifier.journalPhysics in Medicine and Biologyen
html.description.abstractThe implementation of intensity modulated radiotherapy by dynamic multileaf collimator control involves the use of interpreter software which creates leaf trajectory plans for each leaf pair. Interpreter software for use with an Elekta SL15 linear accelerator and dedicated multileaf collimator has been written and tested. In practice the ideal trajectory plans often predict contact between leaves from opposing leaf banks, but this is prohibited by control software on the Elekta system as it could lead to mechanical damage. If the modulation within the geometric limits of a shaped field is not to be compromised then strategies to avoid leaf contact result in additional unwanted doses outside the geometric edge. The magnitude of any such additional dose can be reduced to acceptable levels by a technique which we have called rectangular edge synchronization. The performance of interpreter software which incorporates rectangular edge synchronization has been compared with that of potentially more efficient software which does not. The option containing the rectangular edge synchronization algorithm was shown to work consistently well at high monitor unit rates, and without incurring leaf contacts, under a wide range of test conditions. It therefore provides a sound basis for using intensity modulation to replace mechanical wedges, to simulate customized patient shape compensators, or to implement the results of inverse treatment planning processes that require superimposed intensity modulated beams.


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