Dosimetric effects and impacts caused by a carbon fiber table and its accessories in a linear accelerator
DOI:
https://doi.org/10.22317/jcms.v9i3.1355Keywords:
Carbon Fiber, Attenuation, Couch Inserts, Photon Beam, Treatment PlanningAbstract
Objective : Most contemporary treatment planning systems (TPS) exclude the couch during treatment planning. The present investigation aimed to evaluate the impact of couches and accessories on radiation therapy planning by quantifying the degree of attenuation for two-photon beam energies, 6 MV and 10 MV, at two different field sizes, 5 cm x 5 cm and 10 cm x 10 cm.
Methods: An x-ray radiation beam at two energies (6 MV and 10 MV) generated by a linear accelerator (Elekta Synergy). The output dose was measured using a digital parallel plate ionization chamber of the IBA cc13 type (IBA Dosimetry, Germany), and the readings were recorded with a 2944 Farmer Type chamber. Different commercially available couch tops and accessories evaluated in this study.
Results: The results show that the highest attenuation values were observed at 1300 gantry angles for both energies and field sizes. The lowest attenuation values were recorded at 1000 gantry angles with 6 MV energy for 5cm x 5cm and 10cm x 10cm field sizes. The breast board with D level demonstrated the highest attenuation of 6.27% and 5.51% for 6 MV and 10 MV energies, respectively.
Conclusion: the findings indicate that the degree of attenuation is not uniform across all angles and may exceed tolerable limits, indicating the need for careful consideration during treatment planning to ensure optimal treatment outcomes.
References
Njeh CF, Parker J, Spurgin J, Rhoe E. A validation of carbon fiber imaging couch top modeling in two radiation therapy treatment planning systems: Philips Pinnacle3 and BrainLAB iPlan RT Dose. Radiation Oncology. 2012;7(1):1–11.
Lv R, Yang G, Huang Y, Wang Y. Dosimetric effects of supine immobilization devices on the skin in intensity-modulated radiation therapy for breast cancer: a retrospective study. BMC Cancer. 2021;21(1).
McCormack S, Diffey J, Morgan A. The effect of gantry angle on megavoltage photon beam attenuation by a carbon fiber couch insert. Med Phys. 2005;32(2):483–7.
Meydanci TP, Kemikler G. Effect of a carbon fiber tabletop on the surface dose and attenuation for high-energy photon beams. Radiation Medicine - Medical Imaging and Radiation Oncology. 2008;26(9).
Gergelis KR, Jethwa KR, Tryggestad EJ, Ashman JB, Haddock MG, Hallemeier CL. Proton beam radiotherapy for esophagus cancer: State of the art. Vol. 12, Journal of Thoracic Disease. 2020.
SC V, RS K, ML D, BJ H. Two-dimensional measurement of photon beam attenuation by the treatment couch and immobilization devices using an electronic portal imaging device. Med Phys. 2003;30(11):2981–7.
Higgins J, Bezjak A, Hope A, Panzarella T, Li W, Cho JBC, et al. Effect of image-guidance frequency on geometric accuracy and setup margins in radiotherapy for locally advanced lung cancer. Int J Radiat Oncol Biol Phys [Internet]. 2011 Aug 1 [cited 2021 May 18];80(5):1330–7. Available from: http://www.redjournal.org/article/S0360301610005109/fulltext
E V, G N, A C, A F, L C. The impact of treatment couch modelling on RapidArc. Phys Med Biol. 2009;54(9).
KB P, RM H, D F, D L, RA W, SF K. The clinical impact of the couch top and rails on IMRT and arc therapy. Phys Med Biol. 2011 Nov 4;56(23):7435–47.
T T, B G, C D, IA P. A Monte Carlo model of the Varian IGRT couch top for RapidArc QA. Phys Med Biol. 2011 Dec 21;56(24).
Spezi E, Angelini AL, Romani F, Guido A, Bunkheila F, Ntreta M, et al. Evaluating the influence of the Siemens IGRT carbon fibre tabletop in head and neck IMRT. Radiotherapy and Oncology. 2008 Oct 1;89(1):114–22.
Z H, J D, L L, Y C, G F. Evaluating and modeling of photon beam attenuation by a standard treatment couch. J Appl Clin Med Phys. 2011 Jul 12;12(4):3561–3561.
LH G, M N, BJ N. Dose perturbations by two carbon fiber treatment couches and the ability of a commercial treatment planning system to predict these effects. Med Phys. 2010;37(1):322–8.
IB M, P C, Y Y, V R, EG M. Modeling of carbon fiber couch attenuation properties with a commercial treatment planning system. Med Phys. 2008;35(11):4982–8.
Khan FM, Gibbons JP, Sperduto PW. Khan’s Treatment Planning in Radiation Oncology. 4th Editio. Lippincott Williams & Wilkins (Wolters Kluwer). Philadelphia, PA: Lippincott Williams & Wilkins (Wolters Kluwer); 2018.
Muhtarom, Hidayanto E, Sutanto H. Analysis of the Effect of carbon fiber utilization on Cobalt- 60 Teletherapy to the depth dose and the surface dose. International Journal of Innovative Research in Advanced Engineering. 2017;4(04):2015–8.
RA P, JB F, IA B, JA B. RapidArc radiation therapy: first year experience at the University of Alabama at Birmingham. Int J Radiat Oncol Biol Phys. 2010;77(3):932–41.
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