Verification of monitor unit calculations for non-IMRT clinical radiotherapy: Report of AAPM Task Group 114

Robin L Stern, Robert Heaton, Martin W. Fraser, S. Murty Goddu, Thomas H. Kirby, Kwok Leung Lam, Andrea Molineu, Timothy C. Zhu

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

The requirement of an independent verification of the monitor units (MU) or time calculated to deliver the prescribed dose to a patient has been a mainstay of radiation oncology quality assurance. The need for and value of such a verification was obvious when calculations were performed by hand using look-up tables, and the verification was achieved by a second person independently repeating the calculation. However, in a modern clinic using CT/MR/PET simulation, computerized 3D treatment planning, heterogeneity corrections, and complex calculation algorithms such as convolution/superposition and Monte Carlo, the purpose of and methodology for the MU verification have come into question. In addition, since the verification is often performed using a simpler geometrical model and calculation algorithm than the primary calculation, exact or almost exact agreement between the two can no longer be expected. Guidelines are needed to help the physicist set clinically reasonable action levels for agreement. This report addresses the following charges of the task group: (1) To re-evaluate the purpose and methods of the "independent second check" for monitor unit calculations for non-IMRT radiation treatment in light of the complexities of modern-day treatment planning. (2) To present recommendations on how to perform verification of monitor unit calculations in a modern clinic. (3) To provide recommendations on establishing action levels for agreement between primary calculations and verification, and to provide guidance in addressing discrepancies outside the action levels. These recommendations are to be used as guidelines only and shall not be interpreted as requirements.

Original languageEnglish (US)
Pages (from-to)504-530
Number of pages27
JournalMedical Physics
Volume38
Issue number1
DOIs
StatePublished - Jan 2011

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Radiotherapy
Guidelines
Radiation Oncology
Therapeutics
Hand
Radiation

Keywords

  • monitor units
  • quality assurance

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging

Cite this

Stern, R. L., Heaton, R., Fraser, M. W., Murty Goddu, S., Kirby, T. H., Lam, K. L., ... Zhu, T. C. (2011). Verification of monitor unit calculations for non-IMRT clinical radiotherapy: Report of AAPM Task Group 114. Medical Physics, 38(1), 504-530. https://doi.org/10.1118/1.3521473

Verification of monitor unit calculations for non-IMRT clinical radiotherapy : Report of AAPM Task Group 114. / Stern, Robin L; Heaton, Robert; Fraser, Martin W.; Murty Goddu, S.; Kirby, Thomas H.; Lam, Kwok Leung; Molineu, Andrea; Zhu, Timothy C.

In: Medical Physics, Vol. 38, No. 1, 01.2011, p. 504-530.

Research output: Contribution to journalArticle

Stern, RL, Heaton, R, Fraser, MW, Murty Goddu, S, Kirby, TH, Lam, KL, Molineu, A & Zhu, TC 2011, 'Verification of monitor unit calculations for non-IMRT clinical radiotherapy: Report of AAPM Task Group 114', Medical Physics, vol. 38, no. 1, pp. 504-530. https://doi.org/10.1118/1.3521473
Stern, Robin L ; Heaton, Robert ; Fraser, Martin W. ; Murty Goddu, S. ; Kirby, Thomas H. ; Lam, Kwok Leung ; Molineu, Andrea ; Zhu, Timothy C. / Verification of monitor unit calculations for non-IMRT clinical radiotherapy : Report of AAPM Task Group 114. In: Medical Physics. 2011 ; Vol. 38, No. 1. pp. 504-530.
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