Evaluation of the effect of tooth and dental restoration material on electron dose distribution and production of photon contamination in electron beam radiotherapy

详细信息    查看全文

• 作者：Mohammad Taghi Bahreyni Toossi…
• 关键词：Monte Carlo simulation ; Electron mode ; Tooth ; Dental restoration material
• 刊名：Australasian Physical & Engineering Sciences in Medicine
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：39
• 期：1
• 页码：113-122
• 全文大小：1,183 KB
• 参考文献：1.Reitemeier B, Reitemeier G, Schmidt A, Schaal W, Blochberger P, Lehmann D, Herrmann T (2002) Evaluation of a device for attenuation of electron release from dental restorations in a therapeutic radiation field. J Prosthet Dent 87(3):323–327CrossRef PubMed
  2.Bjelkengren U (2007) Absorbed dose distributions in the vicinity of high-density materials in head and neck radiotherapy: a quantitative comparison between measurements, Monte Carlo simulations and treatment planning system. MSc Thesis in Medical Radiation Physics Clinical Science, Lund University. http://​www.​lunduniversity.​lu.​se/​o.​o.​i.​s?​id=​24965&​postid=​2157049
  3.Farahani M, Eichmiller FC, McLaughlin WL (1990) Measurement of absorbed doses near metal and dental material interfaces irradiated by X- and gamma-ray therapy beams. Phys Med Biol 35(3):369–385CrossRef PubMed
  4.Chin DW, Treister N, Friedland B, Cormack RA, Tishler RB, Makrigiorgos GM et al (2009) Effect of dental restorations and prostheses on radiotherapy dose distribution: a Monte Carlo study. J Appl Clin Med Phys 10(1):80–89CrossRef
  5.Abdul Aziz MZ, Yusoff AL, Salikin MS (2011) Monte Carlo electron beam dose distribution near high density inhomogeneities interfaces. World Acad Sci Eng Technol 58:338–341
  6.Shiu AS, Hogstrom KR (1991) Dose in bone and tissue near bone-tissue interface from electron beam. Int J Radiat Oncol Biol Phys 21(3):695–702CrossRef PubMed
  7.Bahreyni Toossi MT, Ghorbani M, Akbari F, Sobhkhiz Sabet L, Mehrpouyan M (2013) Monte Carlo modeling of electron modes of a Siemens Primus linac (8, 12 and 14 MeV). J Radiother Pract 12(4):352–359CrossRef
  8.Waters LS. MCNPX user’s manual, version 2.4.0. Report LA-CP-02-408 2002; Los Alamos National Laboratory
  9.The International Commission on Radiation Units and Measurements. Tissue substitutes in radiation dosimetry and measurement. ICRU Report 44. Bethesda, MD (1989)
  10.Shved VA, Shishkina EA (2000) Assessment of tooth tissues dose rate coefficients from incorporated strontium-90 in EPR dose reconstruction for the Techa Riverside population. In: Harmonization of radiation, human life and the ecosystem, Proceedings of 10th international congress on radiation protection. International Radiation Protection Association, Hiroshima; CD-ROM; Paper No. P-3a-212
  11.National Institute of Standards and Technology (NIST) (2014) http://​physics.​nist.​gov/​cgi-bin/​Star/​edata.​pl
  12.National Institute of Standards and Technology (NIST) (2014) http://​physics.​nist.​gov/​PhysRefData/​XrayMassCoef/​ComTab/​tissue.​html
  13.el-Khatib EE, Scrimger J, Murray B (1991) Reduction of the Bremsstrahlung component of clinical electron beams: implications for electron arc therapy and total skin electron irradiation. Phys Med Biol 36(1):111–118CrossRef PubMed
  14.Sharma AK, Supe SS, Anantha N, Subbarangaiah K (1995) Physical characteristics of photon and electron beams from a dual energy linear accelerator. Med Dosim 20(1):55–66CrossRef PubMed
  
• 作者单位：Mohammad Taghi Bahreyni Toossi (1)
  Mahdi Ghorbani (1)
  Fatemeh Akbari (2)
  Mohammad Mehrpouyan (3) (4)
  Leila Sobhkhiz Sabet (2)
  
  1. Medical Physics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
  2. Medical Physics Department, Reza Radiation Oncology Center, Mashhad, Iran
  3. Bioinformatics Research Center, Sabzevar University of Medical Sciences, Sabzevar, Iran
  4. Radiology and Radiotherapy Department, Faculty of Medicine, Sabzevar University of Medical Sciences, Sabzevar, Iran
  
• 刊物主题：Biomedicine general; Biophysics and Biological Physics; Medical and Radiation Physics; Biomedical Engineering;
• 出版者：Springer Netherlands
• ISSN：1879-5447

文摘

The aim of this study is to evaluate the effect of tooth and dental restoration materials on electron dose distribution and photon contamination production in electron beams of a medical linac. This evaluation was performed on 8, 12 and 14 MeV electron beams of a Siemens Primus linac. MCNPX Monte Carlo code was utilized and a 10 × 10 cm2 applicator was simulated in the cases of tooth and combinations of tooth and Ceramco C3 ceramic veneer, tooth and Eclipse alloy and tooth and amalgam restoration materials in a soft tissue phantom. The relative electron and photon contamination doses were calculated for these materials. The presence of tooth and dental restoration material changed the electron dose distribution and photon contamination in phantom, depending on the type of the restoration material and electron beam’s energy. The maximum relative electron dose was 1.07 in the presence of tooth including amalgam for 14 MeV electron beam. When 100.00 cGy was prescribed for the reference point, the maximum absolute electron dose was 105.10 cGy in the presence of amalgam for 12 MeV electron beam and the maximum absolute photon contamination dose was 376.67 μGy for tooth in 14 MeV electron beam. The change in electron dose distribution should be considered in treatment planning, when teeth are irradiated in electron beam radiotherapy. If treatment planning can be performed in such a way that the teeth are excluded from primary irradiation, the potential errors in dose delivery to the tumour and normal tissues can be avoided.