Monitor unit calculation verification in radiotherapy for non-IMRT irradiation

Authors

  • Puntiwa Oonsiri Division of Radiation Oncology, Department of Radiology, King Chulalongkorn Memorial Hospital, Thai Red Cross Society

Keywords:

quality assurance, monitor units, independent calculation verification check, radiation therapy

Abstract

The calculation verification of irradiation time or monitor units (MU) plays an important part in radiation oncology quality assurance. The method is performed by an independent physicist who does not involve in the planning procedure. It could be basically calculated by hand using look-up tables of parameters and correction factors or more modern processes using complex calculation algorithms and heterogeneity correction software. The calculation should be verified prior to the treatment to ensure that the dose is accurately and safely delivered. The purpose of this article is to clarify the process of MU calculation verification in radiotherapy and provide guidance for the action levels.

References

Yeung TK, Bortolotto K, Cosby S, Hoar M, Lederer E. Quality assurance in radiotherapy: evaluation of errors and incidents recorded over a 10 year period. Radiother Oncol. 2005;74:283-91.

Miften M, Olch A, Mihailidis D, Moran J, Pawlicki T, Molineu A, et al. Tolerance limits and methodologies for IMRT measurement‐based verification QA: recommendations of AAPM Task Group No. 218. Med Phys. 2018;45:e53-e83.

ICRP I. Preventing accidental exposures from new external beam radiation therapy technologies, ICRP 112. Ann ICRP 2009;39.

Klein EE, Hanley J, Bayouth J, Yin FF, Simon W, Dresser S, et al. Task Group 142 report: Quality assurance of medical accelerators a. Med Phys. 2009;36:4197-212.

พันทิวา อุณห์ศิริ. การประกันคุณภาพเครื่องฉายรังสีรุ่น TrueBEAM ด้วยวิธี Machine Performance Check (MPC). J Thai Assoc Radiat Oncol. 2018;24:45-52.

Bissonnette JP, Balter PA, Dong L, Langen KM, Lovelock DM, Miften M, et al. Quality assurance for image‐guided radiation therapy utilizing CT‐based technologies: a report of the AAPM TG‐179. Med Phys. 2012;39:1946-63.

พันทิวา อุณห์ศิริ. การใช้ IsoCal ในการประเมินระบบจุดหมุนของเครื่องฉายรังสียี่ห้อ Varian รุ่น C-series และ รุ่น TrueBeam. J Thai Assoc Radiat Oncol. 2019;25:19-27.

Stern RL, Heaton R, Fraser MW, Goddu SM, Kirby TH, Lam KL, et al. Verification of monitor unit calculations for non‐IMRT clinical radiotherapy: report of AAPM Task Group 114. Med Phys. 2011;38:504-30.

Fraass B, Doppke K, Hunt M, Kutcher G, Starkschall G, Stern R, et al. AAPM Radiation Therapy Committee Task Group 53: Quality assurance for clinical radiotherapy treatment planning. Med Phys. 1998;25:1773-829.

Tuazon B, Narayanasamy G, Papanikolaou N, Kirby N, Mavroidis P, Stathakis S. Evaluation and comparison of second-check monitor unit calculation software with Pinnacle3 treatment planning system. Phys Medica. 2018;45:186-91.

Jamema S, Upreti R, Sharma S, Deshpande D. Commissioning and comprehensive quality assurance of commercial 3D treatment planning system using IAEA Technical Report Series—430. Australas Phys Eng S. 2008;31:207-15.

Khan FM, Gibbons J, Mihailidis D, Alkhatib H. Khan's Lectures: Handbook of the physics of radiation therapy: Lippincott Williams & Wilkins; 2012.

Radiology ACo. Practice guideline for 3D external beam radiation planning and conformal therapy. 2011.

Kay I, Meyer T. Verifying monitor unit calculations for tangential whole‐breast fields in three‐dimensional planning. J Appl Clin Med Phys. 2008;9:47-53.

International Commission on Radiation Units. Prescribing, recording, and reporting photon beam therapy: ICRU Report No. 50. 1993.

International Commission on Radiation Units. Prescribing, recording, and reporting photon beam therapy: ICRU Report No. 62. 1999

Kutcher GJ, Coia L, Gillin M, Hanson WF, Leibel S, Morton RJ, et al. Comprehensive QA for radiation oncology: report of AAPM radiation therapy committee task group 40. Med Phys. 1994;21:581-.

Vazquez-Quino LA, Huerta-Hernandez CI, Rangaraj D. Clinical experience with machine log file software for volumetric-modulated arc therapy techniques. Proc (Bayl Univ Med Cent). 2017;30:276-279.

Au IWL, Ciurlionis L, Campbell N, Goodwin D. Validation of the Mobius system for patient-specific quality assurance using introduced intentional errors. Australas Phys Eng S. 2017;40:181-9.

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Published

2020-08-03

How to Cite

1.
Oonsiri P. Monitor unit calculation verification in radiotherapy for non-IMRT irradiation. J Thai Assn of Radiat Oncol [Internet]. 2020 Aug. 3 [cited 2024 Apr. 18];26(2):O28-O37. Available from: https://he01.tci-thaijo.org/index.php/jtaro/article/view/242072

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Section

Review articles