Rectangular edge synchronization for intensity modulated radiation therapy with dynamic multileaf collimation.

2.50
Hdl Handle:
http://hdl.handle.net/10541/91972
Title:
Rectangular edge synchronization for intensity modulated radiation therapy with dynamic multileaf collimation.
Authors:
Budgell, Geoff J; Sykes, Jonathan R; Wilkinson, John M
Abstract:
The 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.
Affiliation:
North Western Medical Physics, Christie Hospital NHS Trust, Manchester, UK. prsgjb@dalpha2.cr.man.ac.uk
Citation:
Rectangular edge synchronization for intensity modulated radiation therapy with dynamic multileaf collimation. 1998, 43 (10):2769-84 Phys Med Biol
Journal:
Physics in Medicine and Biology
Issue Date:
Oct-1998
URI:
http://hdl.handle.net/10541/91972
DOI:
10.1088/0031-9155/43/10/007
PubMed ID:
9814516
Type:
Article
Language:
en
ISSN:
0031-9155
Appears in Collections:
All Christie Publications

Full metadata record

DC FieldValue Language
dc.contributor.authorBudgell, Geoff Jen
dc.contributor.authorSykes, Jonathan Ren
dc.contributor.authorWilkinson, John Men
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.en
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

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