Improved delivery efficiency for step and shoot intensity modulated radiotherapy using a fast-tuning magnetron.
dc.contributor.author | Budgell, Geoff J | |
dc.contributor.author | Martens, C | |
dc.contributor.author | Claus, F | |
dc.date.accessioned | 2009-10-02T12:25:27Z | |
dc.date.available | 2009-10-02T12:25:27Z | |
dc.date.issued | 2001-11 | |
dc.identifier.citation | Improved delivery efficiency for step and shoot intensity modulated radiotherapy using a fast-tuning magnetron. 2001, 46 (11):N253-61 Phys Med Biol | en |
dc.identifier.issn | 0031-9155 | |
dc.identifier.pmid | 11720366 | |
dc.identifier.uri | http://hdl.handle.net/10541/83337 | |
dc.description.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. | |
dc.language.iso | en | en |
dc.subject.mesh | Magnetics | |
dc.subject.mesh | Particle Accelerators | |
dc.subject.mesh | Radiometry | |
dc.subject.mesh | Radiotherapy, Conformal | |
dc.subject.mesh | Reproducibility of Results | |
dc.subject.mesh | Time Factors | |
dc.title | Improved delivery efficiency for step and shoot intensity modulated radiotherapy using a fast-tuning magnetron. | en |
dc.type | Article | en |
dc.contributor.department | North Western Medical Physics, Christie Hospital NHS Trust, Manchester, UK. Geoff.Budgell@physics.cr.man.ac.uk | en |
dc.identifier.journal | Physics in Medicine and Biology | en |
html.description.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. |