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On the sensitivity of TG-119 and IROC credentialing to TPS commissioning errors.

Publication ,  Journal Article
McVicker, D; Yin, F-F; Adamson, JD
Published in: J Appl Clin Med Phys
January 2016

We investigate the sensitivity of IMRT commissioning using the TG-119 C-shape phantom and credentialing with the IROC head and neck phantom to treatment planning system commissioning errors. We introduced errors into the various aspects of the commissioning process for a 6X photon energy modeled using the analytical anisotropic algorithm within a commercial treatment planning system. Errors were implemented into the various components of the dose calculation algorithm including primary photons, secondary photons, electron contamination, and MLC parameters. For each error we evaluated the probability that it could be committed unknowingly during the dose algorithm commissioning stage, and the probability of it being identified during the verification stage. The clinical impact of each commissioning error was evaluated using representative IMRT plans including low and intermediate risk prostate, head and neck, mesothelioma, and scalp; the sensitivity of the TG-119 and IROC phantoms was evaluated by comparing dosimetric changes to the dose planes where film measurements occur and change in point doses where dosimeter measurements occur. No commissioning errors were found to have both a low probability of detection and high clinical severity. When errors do occur, the IROC credentialing and TG 119 commissioning criteria are generally effective at detecting them; however, for the IROC phantom, OAR point-dose measurements are the most sensitive despite being currently excluded from IROC analysis. Point-dose measurements with an absolute dose constraint were the most effective at detecting errors, while film analysis using a gamma comparison and the IROC film distance to agreement criteria were less effective at detecting the specific commissioning errors implemented here. PACS number: 87.55.Qr.

Duke Scholars

Published In

J Appl Clin Med Phys

DOI

EISSN

1526-9914

Publication Date

January 2016

Volume

17

Issue

1

Start / End Page

34 / 48

Location

United States

Related Subject Headings

  • Radiotherapy, Intensity-Modulated
  • Radiotherapy Setup Errors
  • Radiotherapy Planning, Computer-Assisted
  • Radiotherapy Dosage
  • Radiometry
  • Prognosis
  • Phantoms, Imaging
  • Nuclear Medicine & Medical Imaging
  • Humans
  • Head and Neck Neoplasms
 

Citation

APA
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ICMJE
MLA
NLM
McVicker, D., Yin, F.-F., & Adamson, J. D. (2016). On the sensitivity of TG-119 and IROC credentialing to TPS commissioning errors. J Appl Clin Med Phys, 17(1), 34–48. https://doi.org/10.1120/jacmp.v17i1.5452
McVicker, Drew, Fang-Fang Yin, and Justus D. Adamson. “On the sensitivity of TG-119 and IROC credentialing to TPS commissioning errors.J Appl Clin Med Phys 17, no. 1 (January 2016): 34–48. https://doi.org/10.1120/jacmp.v17i1.5452.
McVicker D, Yin F-F, Adamson JD. On the sensitivity of TG-119 and IROC credentialing to TPS commissioning errors. J Appl Clin Med Phys. 2016 Jan;17(1):34–48.
McVicker, Drew, et al. “On the sensitivity of TG-119 and IROC credentialing to TPS commissioning errors.J Appl Clin Med Phys, vol. 17, no. 1, Jan. 2016, pp. 34–48. Pubmed, doi:10.1120/jacmp.v17i1.5452.
McVicker D, Yin F-F, Adamson JD. On the sensitivity of TG-119 and IROC credentialing to TPS commissioning errors. J Appl Clin Med Phys. 2016 Jan;17(1):34–48.

Published In

J Appl Clin Med Phys

DOI

EISSN

1526-9914

Publication Date

January 2016

Volume

17

Issue

1

Start / End Page

34 / 48

Location

United States

Related Subject Headings

  • Radiotherapy, Intensity-Modulated
  • Radiotherapy Setup Errors
  • Radiotherapy Planning, Computer-Assisted
  • Radiotherapy Dosage
  • Radiometry
  • Prognosis
  • Phantoms, Imaging
  • Nuclear Medicine & Medical Imaging
  • Humans
  • Head and Neck Neoplasms