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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.
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
html.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.


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