Improved delivery efficiency for step and shoot intensity modulated radiotherapy using a fast-tuning magnetron.

2.50
Hdl Handle:
http://hdl.handle.net/10541/83337
Title:
Improved delivery efficiency for step and shoot intensity modulated radiotherapy using a fast-tuning magnetron.
Authors:
Budgell, Geoff J; Martens, C; Claus, F
Abstract:
The delivery efficiency of step and shoot intensity modulated radiotherapy (IMRT) has been improved by the installation of fast-tuning magnetrons into three travelling wave linear accelerators. The IMRT delivery efficiency and the beam start-up performance have been compared before and after installation. Start-up and inter sub-field times were reduced by an average of 3.0 s. A typical start-up time from depression of the start button to beam on is now around 4 s. Delivery efficiency for a variety of clinical and quality control prescriptions was improved by an average of 30.7% (range 7.4-60.9%), depending on a complex combination of the number of sub-fields, distance moved by leaves and dose rate. For the oldest accelerator (7 years old), dosimetric accuracy was significantly improved for low dose sub-fields. The dose output was within 2% for a 1 monitor unit (MU) sub-field and 1% for a 2 MU sub-field. The two newer accelerators displayed similar or better dose characteristics even before fast-tuning magnetron installation. Beam symmetries and flatnesses were acceptable at all energies and dose rates, and showed no obvious degradation in low dose sub-fields. It is recommended that fast-tuning magnetrons are adopted for accelerators of this design performing step and shoot IMRT.
Affiliation:
North Western Medical Physics, Christie Hospital NHS Trust, Manchester, UK. Geoff.Budgell@physics.cr.man.ac.uk
Citation:
Improved delivery efficiency for step and shoot intensity modulated radiotherapy using a fast-tuning magnetron. 2001, 46 (11):N253-61 Phys Med Biol
Journal:
Physics in Medicine and Biology
Issue Date:
Nov-2001
URI:
http://hdl.handle.net/10541/83337
PubMed ID:
11720366
Type:
Article
Language:
en
ISSN:
0031-9155
Appears in Collections:
All Christie Publications

Full metadata record

DC FieldValue Language
dc.contributor.authorBudgell, Geoff J-
dc.contributor.authorMartens, C-
dc.contributor.authorClaus, F-
dc.date.accessioned2009-10-02T12:25:27Z-
dc.date.available2009-10-02T12:25:27Z-
dc.date.issued2001-11-
dc.identifier.citationImproved delivery efficiency for step and shoot intensity modulated radiotherapy using a fast-tuning magnetron. 2001, 46 (11):N253-61 Phys Med Biolen
dc.identifier.issn0031-9155-
dc.identifier.pmid11720366-
dc.identifier.urihttp://hdl.handle.net/10541/83337-
dc.description.abstractThe delivery efficiency of step and shoot intensity modulated radiotherapy (IMRT) has been improved by the installation of fast-tuning magnetrons into three travelling wave linear accelerators. The IMRT delivery efficiency and the beam start-up performance have been compared before and after installation. Start-up and inter sub-field times were reduced by an average of 3.0 s. A typical start-up time from depression of the start button to beam on is now around 4 s. Delivery efficiency for a variety of clinical and quality control prescriptions was improved by an average of 30.7% (range 7.4-60.9%), depending on a complex combination of the number of sub-fields, distance moved by leaves and dose rate. For the oldest accelerator (7 years old), dosimetric accuracy was significantly improved for low dose sub-fields. The dose output was within 2% for a 1 monitor unit (MU) sub-field and 1% for a 2 MU sub-field. The two newer accelerators displayed similar or better dose characteristics even before fast-tuning magnetron installation. Beam symmetries and flatnesses were acceptable at all energies and dose rates, and showed no obvious degradation in low dose sub-fields. It is recommended that fast-tuning magnetrons are adopted for accelerators of this design performing step and shoot IMRT.en
dc.language.isoenen
dc.subject.meshMagnetics-
dc.subject.meshParticle Accelerators-
dc.subject.meshRadiometry-
dc.subject.meshRadiotherapy, Conformal-
dc.subject.meshReproducibility of Results-
dc.subject.meshTime Factors-
dc.titleImproved delivery efficiency for step and shoot intensity modulated radiotherapy using a fast-tuning magnetron.en
dc.typeArticleen
dc.contributor.departmentNorth Western Medical Physics, Christie Hospital NHS Trust, Manchester, UK. Geoff.Budgell@physics.cr.man.ac.uken
dc.identifier.journalPhysics in Medicine and Biologyen

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