Addendum to the AAPM's TG-51 protocol for clinical reference dosimetry of high-energy photon beams

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DOIResolve DOI: http://doi.org/10.1118/1.4866223
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TypeArticle
Journal titleMedical Physics
ISSN0094-2405
Volume41
Issue4
Article number41501
Subjectrotraxate; water; accuracy; air temperature; atmospheric pressure; calibration; dosimetry; humidity; ionization chamber; linear accelerator; megavoltage radiotherapy; Monte Carlo method; photon therapy; practice guideline; radiation beam; radiation dose distribution; radiation field; water temperature
AbstractAn addendum to the AAPM's TG-51 protocol for the determination of absorbed dose to water in megavoltage photon beams is presented. This addendum continues the procedure laid out in TG-51 but new kQ data for photon beams, based on Monte Carlo simulations, are presented and recommendations are given to improve the accuracy and consistency of the protocol's implementation. The components of the uncertainty budget in determining absorbed dose to water at the reference point are introduced and the magnitude of each component discussed. Finally, the consistency of experimental determination of N D,w coefficients is discussed. It is expected that the implementation of this addendum will be straightforward, assuming that the user is already familiar with TG-51. The changes introduced by this report are generally minor, although new recommendations could result in procedural changes for individual users. It is expected that the effort on the medical physicist's part to implement this addendum will not be significant and could be done as part of the annual linac calibration.
Publication date
PublisherAmerican Association of Physicists in Medicine
LanguageEnglish
AffiliationNational Research Council Canada; Measurement Science and Standards
Peer reviewedYes
NPARC number21272744
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Record identifiera371d919-a33f-4b4a-9f5c-092c7ea751da
Record created2014-12-03
Record modified2016-05-09
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