Total Workload for Radioactive Facilities with Volumetric Modulated Arc Treatment
DOI:
https://doi.org/10.15392/bjrs.v7i3.928Keywords:
radiation protection, shielding, workload, VMATAbstract
In recent years, there have been major changes in radiotherapy, particularly in dose delivery for treatments using the techniques of Three-Dimensional Conformal Radiation Therapy (3D-CRT), Intensity-Modulated Radiation Therapy (IMRT) and Volumetric Modulated Arc Therapy (VMAT). However, in the literature, no workload results for radiation therapy treatments performed exclusively with the VMAT technique were found. In this study, a new workload and a new VMAT factor will be proposed. For such, patient data originating from management and planning systems were acquired, such as dose values, monitor units, numbers of arcs per patient and number of hypofractionated treatments. The average clinical workload values for conventional treatments were 328 Gy/week, resulting in a VMAT factor of 1.97; similarly, for hypofractionated treatments, the clinical workload was 33Gy/week and the VMAT factor was 1.54. The total workload has a value of 596 Gy/week, less than the value used in the facility shielding design, 1250 Gy/week, and the average value of VMAT factor for conventional and hypofractionated treatments showed that a smaller amount of C should be used at facilities that perform exclusive VMAT treatment.
Downloads
References
RODGERS, J. E.; Radiation therapy vault shielding calculational methods when IMRT and TBI procedures contribute. J Appl Clin Med Phys, v. 2(3), p. 157-164, 2001.
FOLLOWILL, D., GEIS, P., and BOYER, A. Estimates of whole-body dose equivalent produced by beam intensity modulated conformal therapy. Int J Radiat Oncol Biol Phys, v. 38, p. 667–672, 1997.
YU, C. X. Intensity-modulated arc therapy with dynamic multileaf collimation: An alternative to tomotherapy. Phys Med Biol, v. 40, p. 1435–1449, 1995.
CROOKS, S. M., WU, X., TAKITA, C., WATZICH, M., and XING, L., Aperture modulated arc therapy. Phys Med Biol, v. 48, p. 1333–1344, 2003.
BRATENGEIER, K., 2-Step IMAT and 2-Step IMRT in three dimensions Med Phys, v. 32, p. 3849–3861, 2005.
OLIVER, M., ANSBACHER, W., BECKHAM, W. A. Comparing planning time, delivery time and plan quality for IMRT, Rapidarc and tomotherapy. J Appl Clin Med Phys, v. 10, p. 117-131, 2009.
OTTO K. Volumetric modulated arc therapy: IMRT in a single gantry arc. Med Phys, v. 35(1), p. 310–17, 2008.
IAEA - International Atomic Energy Agency. Radiation Protection in the Design of Radiotherapy Facilities. Safety Report Series, IAEA, Vienna 2006.
NCRP - National Council on Radiation Protection and Measurements. Structural Shielding Design and Evaluation for Megavoltage X and Gama-Ray Radiotherapy Facilities. NCRP Report No. 151 Bethesda, MD: NCRP, 2005.
BLOMGREN H. et al. Stereotactic high dose fraction radiation therapy of extracranial tumors using an accelerator. Acta Oncol, v. 34, p. 861-870, 1995.
MCGARRY, R. C., PAPIEZ, L. and WILLIAMS M. Stereotactic body radiation therapy of early-stage non-small-cell lung carcinoma: Phase I study. Int J Radiat Oncol Biol Phys, v. 63, p. 1010-1015, 2005.
BENEDICT, S. H. et al. Stereotactic body radiation therapy: The report of AAPM Task Group 101 of the Therapy Physics Committee of AAPM, Med Phys, v. 37(8), p. 4078-4101, 2010.
STEWART B. W., WILD C. P., editors. World cancer report. Lyon: IARC Press (2014).
DAS, I. et al. Accelerator beam data commissioning equipment and procedures: Report of the TG-106 of the Therapy Physics Committee of the AAPM. Med Phys, v. 35, p. 4186– 4215, 2008.
KLEIN, E. E. et al. Quality assurance of medical accelerators: Report of the TG-142 of the Therapy Physics Committee of the AAPM. Med Phys, v. 36, p. 4197– 4212 2009.
IAEA - International Atomic Energy Agency. Absorbed Dose Determination in External Beam RadioTherapy. Technical Reports Series No. 398, IAEA, Vienna, 2000.
CAMPOS, L. T.; Da ROSA, L. R.; BRAZ, D. Quality Control of Radiotherapy treatment plans with electrons. Braz J Rad Sci, v. 7, p. 1-21, 2019
MUTIC, S. and LOW, D.A. Whole-Body dose from tomotherapy delivery. Int J Radiat Oncol Biol Phys, v. 42(1), p. 229-232, 1998.
PURDY, J.A. et al. Intensity Modulated Therapy: Current status issues of interest. Int J Radiat Oncol Biol Phys, v. 51(4), p. 880-914, 2001.
NCRP - National Council on Radiation Protection and Measurements. Structural Shielding Design and Evaluation for Medical Use of X Rays and Gamma Rays of Energies up to 10 MeV NCRP Report No. 49 Bethesda, MD: NCRP, 1979.
NCRP - National Council on Radiation Protection and Measurements. Radiation Protection Design Guidelines for 0.1-100 MeV Particle Accelerator Facilities, NCRP Report No. 51 Bethesda, MD: NCRP, 1977.
Published
Issue
Section
License
Copyright (c) 2019 Brazilian Journal of Radiation Sciences
This work is licensed under a Creative Commons Attribution 4.0 International License.
Licensing: The BJRS articles are licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
How to Cite
