Nuclear Physics and Atomic Energy


Nuclear Physics and Atomic Energy

  ISSN: 1818-331X (Print), 2074-0565 (Online)
  Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine
  Languages: Ukrainian, English, Russian
  Periodicity: 4 times per year

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Nucl. Phys. At. Energy 2018, volume 19, issue 4, pages 406-411.
Section: Engineering and methods of experiment.
Received: 26.11.2018; Accepted: 26.12.2018; Published online: 14.02.2019.
PDF Full text (en)
https://doi.org/10.15407/jnpae2018.04.406

New approach to evaluate the exit dose quality for high radioprotection and radiotherapy efficiency

Mohamed Bencheikh1,*, Abdelmajid Maghnouj1, Jaouad Tajmouati1, Abdessamad Didi1, Abdesslam Lamrabet1, Yassine Benkhouya2,3

1 LISTA Laboratory, Physics Department, Faculty of Sciences Dhar El-Mahraz, University of Sidi Mohamed Ben Abdellah, Fez, Morocco
2 Department of Radiotherapy, Al Kawtar Clinic, Fez, Morocco
3 University Mohamed V in Rabat, Faculty of Sciences, Laboratory of Nuclear Physics (LPNR), Rabat, Morocco


*Corresponding author. E-mail address: bc.mohamed@gmail.com

Abstract: For safety and radioprotection reasons in radiotherapy treatment, the exit dose is evaluated with irradiation field size and photon beam energy. The objective of this study is to introduce an empirical law for predicting the delivered dose at the other side of patient while radiotherapy treatment of cancer. In this study, the exit dose is the delivered dose out of the phantom on beam central axis. The measurements of percentage depth dose were done as a function of irradiation field size with an uncertainty of 2 % as recommended by IAEA protocols for two photon beam energies 6 and 18 MV. For high radioprotection quality inside radiotherapy department, an empirical law is elaborated with a reliability of 97 %. Thereafter, it consists a basic law that should be used theoretically to know the delivered dose variation with field size at the exit dose point for knowing the behavior of dose outside of radiotherapy treatment region. The medical physicists and physicians should take this law in radiotherapy treatment of the cancer.

Keywords: dose build-up, radiotherapy, photon beam, dosimetry, radiotherapy quality.

References:

1. P. Todd et al. Quality and Safety in Radiotherapy (Taylor & Francis, 2011) 643 p. https://doi.org/10.1201/b10448

2. S.L. Donaldson. Towards Safer Radiotherapy (London, 2006) 85 p. Book

3. A. Didi et al. Neutron activation analysis: Modelling studies to improve the neutron flux of Americium-Beryllium source. Nuclear Engineering and Technology 49(4) (2017) 787. https://doi.org/10.1016/j.net.2017.02.002

4. M. Bencheikh, A. Maghnouj, J. Tajmouati. Photon beam softening coefficients evaluation for a 6 MV photon beam for an aluminum slab: Monte Carlo study using BEAMnrc code, DOSXYZnrc code and BEAMDP code. Moscow University Physics Bulletin 72(3) (2017) 263. https://doi.org/10.3103/S0027134917030043

5. M. Bencheikh, A. Maghnouj, J. Tajmouati. Photon beam softening coefficient determination with slab thickness in small filed size: Monte Carlo study. Phys. Part. Nucl. Letters 14(6) (2017) 963. https://doi.org/10.1134/S1547477117060085

6. M. Bencheikh, A. Maghnouj, J. Tajmouati. Energetic properties investigation of removing flattening filter at phantom surface: Monte Carlo study using BEAMnrc code, DOSXYZnrc code and BEAMDP code. Phys. Part. Nucl. Letters 14(6) (2017) 953. https://doi.org/10.1134/S1547477117060073

7. M. Bencheikh et al. Dosimetry investigation and evaluation for removing flattening filter configuration of linac: Monte Carlo study. Moscow University Physics Bulletin 72(6) (2017) 640. https://doi.org/10.3103/S0027134918660025

8. M. Bencheikh, A. Maghnouj, J. Tajmouati. Relative attenuation and beam softening study with flattening filter volume reduction: Monte Carlo study. Moscow University Physics Bulletin 72(6) (2017) 647. https://doi.org/10.3103/S0027134918660037

9. M. Bencheikh, A. Maghnouj, J. Tajmouati. Study of possibility to reduce flattening filter volume for increasing energetic photons for high radiotherapy efficiency. Moscow University Physics Bulletin 72(6) (2017) 653. https://doi.org/10.3103/S0027134918660049

10. M. Bencheikh et al. Study of photon beam dosimetry quality for removing flattening filter linac configuration. Annals of University of Craiova Physics AUC 27 (2017) 50. https://cis01.central.ucv.ro/pauc/vol/2017_27/7_2017.pdf

11. E.E. Klein et al. Task Group 142 report: Quality assurance of medical accelerators. Medical Physics 36 (2009) 4197. https://doi.org/10.1118/1.3190392

12. R. Nath et al. AAPM code of practice for radiotherapy accelerators: Report of AAPM Radiation Therapy Task Group 45. Medical Physics 21 (1994) 1093. https://doi.org/10.1118/1.597398

13. Societe Suisse de Radiobiologie et de Physique Medicale. Dosimetrie des faisceaux de photons de haute energie laide de chambres dionisation. Recommandations No. 8 (2000) 18 p.

14. Commissioning and Quality Assurance of Computerized Planning Systems for Radiation Treatment of Cancer. Technical Reports Series No. 430 (IAEA, 2004) 281 p.

15. Specification and Acceptance Testing of Radiotherapy Treatment Planning Systems. IAEA-TECDOC-1540 (IAEA, 2007) 61 p.

16. M. Bencheikh et al. Study of 6 MV Photon beam dose profiles, investigation and evaluation of scattered photons and electrons contamination effects on beam dose profiles. Bulg. J. Phys. 45(1) (2018) 67. http://www.bjp-bg.com/papers/bjp2018_1_067-075.pdf

17. M. Bencheikh, A. Maghnouj, J. Tajmouati. Percentage depth dose fragmentation for investigating and assessing the photon beam dosimetry quality. Journal of Radiotherapy in Practice (2018) 1. https://doi.org/10.1017/S1460396918000687