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Evaluating the radiation contamination dose around a high dose per pulse intraoperative radiotherapy accelerator: a Monte Carlo study

Published online by Cambridge University Press:  26 February 2020

Seyed Rashid Hosseini Aghdam Open the ORCID record for Seyed Rashid Hosseini Aghdam [Opens in a new window] ,
Zahra Siavashpour ,
Seyed Mahmoud Reza Aghamiri ,
Saied Rabie Mahdavi  and
Nahid Nafisi
Seyed Rashid Hosseini Aghdam
Affiliation:
Radiation Medicine Department, Shahid Beheshti University, Tehran, Iran
Zahra Siavashpour
Affiliation:
Radiotherapy Oncology Department, Shahid Beheshti Medical University, Tehran, Iran
Seyed Mahmoud Reza Aghamiri
Affiliation:
Radiation Medicine Department, Shahid Beheshti University, Tehran, Iran
Saied Rabie Mahdavi*
Affiliation:
Medical Physics Department, Iran University of Medical Science, Tehran, Iran
Nahid Nafisi
Affiliation:
Surgery Department of Rasool Akram Hospital, Iran University of Medical Science, Tehran, Iran
*
Author for correspondence: Saied Rabi Mahdavi, Medical Physics Department, Iran University of Medical Science, Tehran 14496141525, Iran. Tel: 982188622647. Fax: 982188622647. E-mail: srmahdavi@hotmail.com
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Abstract

Aim:

In this study, the radiation contamination dose (RCD) for different combinations of electron energy/distance, applicator and radius around the light intraoperative accelerator (LIAC), a high dose per pulse dedicated intraoperative electron radiotherapy machine, has been estimated. Being aware about the amount of RCDs is highly recommended for linear medical electron accelerators.

Methods and methods:

Monte Carlo Nuclear Particles (MCNP) code was used to simulate the LIAC® head and calculate RCDs. Experimental RCDs measurements were also done by Advanced Markus chamber inside a MP3-XS water phantom. Relative differences of simulations and measurements were calculated.

Result:

RCD reduction by distance from the machine follows the inverse-square law, as expected. The RCD was decreased by increasing angle from applicator walls opposed to the electron beam direction. The maximum differences between the simulation and measurement results were lower than 3%.

Conclusions:

The RCD is strongly dependent on electron beam energy, applicator size and distance from the accelerator head. Agreement between the MCNP results and ionometric dosimetry confirms the applicability of this simulation code in modelling the intraoperative electron beam and obtaining the dosimetric parameters. The RCD is a parameter that would restrict working with LIAC in an unshielded operative room.

Keywords

IORTLIACMonte Carlo simulationRadiation contamination dose
Type
Original Article
Information
Journal of Radiotherapy in Practice , Volume 19 , Issue 3 , September 2020 , pp. 265 - 276
Copyright
© Cambridge University Press 2020

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References

Baghani, H R, Robatjazi, M, Mahdavi, S R, Hosseini Aghdam, S R.Evaluating the performance characteristics of some ion chamber dosimeters in high dose per pulse intraoperative electron beam radiation therapy. Phys Medica 2019; 58: 81–89.CrossRefGoogle ScholarPubMed
Gunderson, L L, Willett, C G, Calvo, F A, Harrison, L B.Intraoperative Irradiation: Techniques and Results. Department of Radiation Oncology, Mayo Clinic College of Medicine and Mayo Clinic Arizona, Scottsdale, AZ, USA: Springer, llg.scottsdale@cox.net, 2011.CrossRefGoogle Scholar
Baghani, H R, Aghamiri, S M R, Mahdavi, S Ret al.Comparing the dosimetric characteristics of the electron beam from dedicated intraoperative and conventional radiotherapy accelerators. Appl Clin Med Phys 2015; 16: 62–72.CrossRefGoogle ScholarPubMed
Robatjazi, M, Mahdavi, S R, Takavr, Aet al.Application of Gafchromic EBT2 film for intraoperative radiation therapy quality assurance. Phys Medica 2015; 31: 314–319.CrossRefGoogle ScholarPubMed
Baghani, H R, Aghamiri, S M R, Mahdavi, S Ret al.Dosimetric evaluation of Gafchromic EBT2 film for breast intraoperative electron radiotherapy verification. Phys Medica 2015; 31: 37–42.CrossRefGoogle ScholarPubMed
Biggs, P, Willett, C G, Rutten, Het al.Intraoperative electron beam irradiation: physics and techniques. In: Gunderson, L L, Willett, C G, Calvo, F A, Harrison, L B (eds). Intraoperative Irradiation: Techniques and Results, 2nd edition. New York, NY: Humana Press, 2011: 53–56.Google Scholar
Ciocca, M, Pedroli, G, Orecchia, Ret al.Radiation survey around a Liac mobile electron linear accelerator for intraoperative radiation therapy. J Med Phys 2009; 10 (2): 131–138.Google ScholarPubMed
Mills, M D, Fajardo, L C, Wilson, D Let al.Commissioning of a mobile electron accelerator for intraoperative radiotherapy. Appl Clin Med Phys 2001; 2 (3): 121–130.CrossRefGoogle ScholarPubMed
Sam Beddar, A, Sunil, K.Intraoperative radiotherapy using a mobile electron LINAC: a retroperitoneal sarcoma case. J Appl Clin Med Phys 2005; 6 (3): 95–107. doi: 10.1120/jacmp. v6i3.2109.Google Scholar
Soriani, A, Felici, G, Fantini, Met al.Radiation protection measurements around a 12 MeV mobile dedicated IORT accelerator. Med Phys 2010; 37 (3): 995–1003.CrossRefGoogle ScholarPubMed
Strigari, L, Soriani, A, Landoni, V, Teodoli, S, Bruzzaniti, V, Benassi, M.Radiation exposure of personnel during Intraoperative Radiotherapy (IORT): radiation protection aspects. J Exp Clin Cancer Res 2004; 23 (3): 489–494.Google ScholarPubMed
Loi, G, Dominietto, M, Cannillo, Bet al.Neutron production from a mobile linear accelerator operating in electron mode for intraoperative radiation therapy. Phys Med Biol 2006; 51 (3): 695–702.CrossRefGoogle ScholarPubMed
LIAC, the mobile electron accelerator for Intraoperative Radiotherapy (IORT). Technical report 2014. http://www.sordina.com/download/Catalogo_IORT.pdf. Accessed on 27th February.Google Scholar
Beddar, A S, Biggs, P J, Chang, Set al.Intraoperative radiation therapy using mobile electron linear accelerators: report of AAPM Radiation Therapy Committee Task Group No. 72. Med Phys 2006; 33: 1476–1489.CrossRefGoogle ScholarPubMed
Righi, S, Karaj, E, Felici, G, Di Martino, F.Dosimetric characteristics of electron beams produced by two mobile accelerators, Novac7 and Liac, for intraoperative radiation therapy through Monte Carlo simulation. J Appl Clin Med Phys 2013; 14 (1): 6–18.CrossRefGoogle ScholarPubMed
Wysocka, A, Adrich, P, Wasilewski, A.Monte Carlo study of a new mobile electron accelerator head for Intra Operative Radiation Therapy (IORT). Prog Nucl Sci Technol 2011; 2: 181–186.CrossRefGoogle Scholar
Hosseini Aghdam, M R, Baghani, H R, Mahdavi, S Ret al.Monte Carlo study on effective source to surface distance for electron beams from a mobile dedicated IORT accelerator. J Radiother Pract 2016; 16 (1): 29–37. doi: 10.1017/S1460396916000455.CrossRefGoogle Scholar
ICRU. Radiation dosimetry: electrons with initial energies between 1 and 50 MeV. Report No. 35. Washington, DC: International Commission on Radiation Units and Measurement, 1984.Google Scholar