2.50
Hdl Handle:
http://hdl.handle.net/10541/71959
Title:
A study on beam homogeneity for a Siemens Primus linac.
Authors:
Cutanda Henriquez, Francisco; Vargas-Castrillón, Silvia T
Abstract:
Asymmetric offset fields are an important tool for radiotherapy and their suitability for treatment should be assessed. Dose homogeneity for highly asymmetric fields has been studied for a Siemens PRIMUS clinical linear accelerator. Profiles and absolute dose have been measured in fields with two jaws at maximal position (20 cm) and the other two at maximal overtravel (10 cm), corresponding to 10 cm x 10 cm fields with extreme offset. Measured profiles have a marked decreasing gradient towards the beam edge, making these fields unsuitable for treatments. The flattening filter radius is smaller than the primary collimator aperture, and this creates beam inhomogeneities that affect large fields in areas far from the collimator axis, and asymmetric fields with large offset. The results presented assess the effect that the design of the primary collimator and flattening filter assembly has on beam homogeneity. This can have clinical consequences for treatments involving fields that include these inhomogeneous areas. Comparison with calculations from a treatment planning system, Philips Pinnacle v6.3, which computes under the hypotheses of a uniformly flattened beam, results in severe discrepancies.
Affiliation:
NW Medical Physics, Christie Hospital NHS Trust, Withington, Manchester, UK. francisco.cutanda@physics.cr.man.ac.uk
Citation:
A study on beam homogeneity for a Siemens Primus linac. 2007, 30 (2):147-51 Australas Phys Eng Sci Med
Journal:
Australasian Physical & Engineering Sciences in Medicine
Issue Date:
Jun-2007
URI:
http://hdl.handle.net/10541/71959
PubMed ID:
17682405
Type:
Article
Language:
en
ISSN:
0158-9938
Appears in Collections:
All Christie Publications

Full metadata record

DC FieldValue Language
dc.contributor.authorCutanda Henriquez, Francisco-
dc.contributor.authorVargas-Castrillón, Silvia T-
dc.date.accessioned2009-06-30T14:15:18Z-
dc.date.available2009-06-30T14:15:18Z-
dc.date.issued2007-06-
dc.identifier.citationA study on beam homogeneity for a Siemens Primus linac. 2007, 30 (2):147-51 Australas Phys Eng Sci Meden
dc.identifier.issn0158-9938-
dc.identifier.pmid17682405-
dc.identifier.urihttp://hdl.handle.net/10541/71959-
dc.description.abstractAsymmetric offset fields are an important tool for radiotherapy and their suitability for treatment should be assessed. Dose homogeneity for highly asymmetric fields has been studied for a Siemens PRIMUS clinical linear accelerator. Profiles and absolute dose have been measured in fields with two jaws at maximal position (20 cm) and the other two at maximal overtravel (10 cm), corresponding to 10 cm x 10 cm fields with extreme offset. Measured profiles have a marked decreasing gradient towards the beam edge, making these fields unsuitable for treatments. The flattening filter radius is smaller than the primary collimator aperture, and this creates beam inhomogeneities that affect large fields in areas far from the collimator axis, and asymmetric fields with large offset. The results presented assess the effect that the design of the primary collimator and flattening filter assembly has on beam homogeneity. This can have clinical consequences for treatments involving fields that include these inhomogeneous areas. Comparison with calculations from a treatment planning system, Philips Pinnacle v6.3, which computes under the hypotheses of a uniformly flattened beam, results in severe discrepancies.en
dc.language.isoenen
dc.subject.meshParticle Accelerators-
dc.subject.meshPhantoms, Imaging-
dc.subject.meshRadiotherapy-
dc.titleA study on beam homogeneity for a Siemens Primus linac.en
dc.typeArticleen
dc.contributor.departmentNW Medical Physics, Christie Hospital NHS Trust, Withington, Manchester, UK. francisco.cutanda@physics.cr.man.ac.uken
dc.identifier.journalAustralasian Physical & Engineering Sciences in Medicineen
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