The design of an audit test for 60Co brachytherapy treatment planning system

Mohammad Javad Tahmasebi Birgani, Hadis Khorshidsavar, Ali Bagheri, Amir Danyaei, Neda Abdalvand

DOI: 10.4103/jmss.JMSS_47_19

Abstract


Background: Auditing the treatment planning system (TPS) software for a radiotherapy unit is of paramount importance in any radiation therapy department. A Plexiglas phantom was proposed to measure the ionization of 60Co high dose rate (HDR) source and compare dose points in the planning system for auditing and verifying TPS. Methods: Auditing was performed using a Plexiglas phantom in an end-to-end test, and relative dose points were detected by a farmer-type ionization chamber and compared with the relative dose of similar points in TPS. The audit results were determined as pass optimal level (<3.3%), pass action level (between 3.3% and 5%), and out of tolerance (>5%). Results: The comparison of the collected data revealed that 80% of the measured values were ?5% in the pass level, and 20% of the points were out of tolerance (between 5% and 6.99%). Conclusion: This study documented the appropriateness of the dosimetry audit test and this phantom design for the HDR brachytherapy TPS.

Keywords


Audit, brachytherapy, dosimetry, Plexiglas phantom, radiotherapy

Full Text:

PDF

References


Gurjar OP, Batra M, Bagdare P, Kaushik S, Tyagi A, Naik A, et al. Dosimetric analysis of Co-60 source based high dose rate (HDR) brachytherapy: A case series of ten patients with carcinoma of the uterine cervix. Rep Pract Oncol Radiother 2016;21:201-6.

Sinnatamby M, Nagarajan V, Sathyanarayana RK, Karunanidhi G, Singhavajala V. Study of the dosimetric differences between (192)Ir and (60)Co sources of high dose rate brachytherapy for breast interstitial implant. Rep Pract Oncol Radiother 2016;21:453-9.

Rejab M, Wong JH, Jamalludin Z, Jong WL, Malik RA, Wan Ishak WZ, et al. Dosimetric characterisation of the optically-stimulated luminescence dosimeter in cobalt-60 high dose rate brachytherapy system. Australas Phys Eng Sci Med 2018;41:475-85.

Rivard MJ, Coursey BM, DeWerd LA, Hanson WF, Huq MS, Ibbott GS, et al. Update of AAPM task group no. 43 report: A revised AAPM protocol for brachytherapy dose calculations. Med Phys 2004;31:633-74.

Tedgren ÅC, Bengtsson E, Hedtjärn H, Johansson Å, Karlsson L, Lamm IL, et al. Experience from long-term monitoring of RAKR ratios in 192Ir brachytherapy. Radiother Oncol 2008;89:217-21.

Clark CH, Jornet N, Muren LP. The role of dosimetry audit in achieving high quality radiotherapy. Phys Imaging Radiat Oncol 2018;5:85-7.

Palmer AL, Bradley DA, Nisbet A. Dosimetric audit in brachytherapy. Br J Radiol 2014;87:20140105-20140105.

Pasler M, Hernandez V, Jornet N, Clark CH, et al. Novel methodologies for dosimetry audits: Adapting to advanced radiotherapy techniques. Phys Imaging Radiat Oncol 2018;5:76-84.

Kirisits C, Rivard MJ, Baltas D, Ballester F, De Brabandere M, van der Laarse R, et al. Review of clinical brachytherapy uncertainties: Analysis guidelines of GEC-ESTRO and the AAPM. Radiother Oncol 2014;110:199-212.

Gholami S, Mirzaei H, Jabbary Arfaee A, Jaberi R, Nedaie H, Mahdavi SR, et al. A novel phantom design for brachytherapy quality assurance. Int J Radiat Res 2016;14:67-71.

Palmer AL, Bidmead M, Nisbet A. A survey of quality control practices for high dose rate (HDR) and pulsed dose rate (PDR) brachytherapy in the United Kingdom. J Contemp Brachyther 2012;4:232-40.

Palmer A, Mzenda B. Performance assessment of the BEBIG MultiSource high dose rate brachytherapy treatment unit. Phys Med Biol 2009;54:7417-34.

Okamoto H, Nakamura S, Nishioka S, Iijima K, Wakita A, Abe Y, et al. Independent assessment of source position for gynecological applicator in high-dose-rate brachytherapy. J Contemp Brachyther 2017;9:477-86.

Casey KE, Alvarez P, Kry SF, Howell RM, Lawyer A, Followill D. Development and implementation of a remote audit tool for high dose rate (HDR) Ir-192 brachytherapy using optically stimulated luminescence dosimetry. Med Phys 2013;40:112102.

Ochoa R, Gómez F, Ferreira IH, Gutt F, de Almeida CE. Design of a phantom for the quality control of high dose rate 192Ir source used in brachytherapy. Radiother Oncol 2007;82:222-8.

Diez P, Aird EG, Sander T, Gouldstone CA, Sharpe PH, Lee CD, et al. A multicentre audit of HDR/PDR brachytherapy absolute dosimetry in association with the INTERLACE trial (NCT015662405). Phys Med Biol 2017;62:8832-49.

Krause F, Risske F, Bohn S, Delaperriere M, Dunst J, Siebert FA. End-to-end test for computed tomography-based high-dose-rate brachytherapy. J Contemp Brachyther 2018;10:551.

Palmer AL, Diez P, Laura Gandon 3, Andrea Wynn-Jones 3, Peter Bownes 3, Chris Leeet al. A multicentre “end to end” dosimetry audit for cervix HDR brachytherapy treatment. Radiother Oncol 2015;114:264-71.

Hill R, Mo Z, Haque M, Baldock C. An evaluation of ionization chambers for the relative dosimetry of kilovoltage x-ray beams. Med Phys 2009;36:3971-81.

Haworth A, Wilfert L, Butler D, Ebert MA, Todd S, Bucci J, et al. Australasian brachytherapy audit: Results of the “end-to-end” dosimetry pilot study. J Med Imaging Radiat Oncol 2013;57:490-8.

Lehmann AA, Dunn L, Shaw M, Kenny J, Keehan S, Supple J, et al. Dosimetric end-to-end tests in a national audit of 3D conformal radiotherapy. Phys Imaging Radiat Oncol 2018;6:5-11.

Nakamura M, Minemura T, Ishikura S, Nishio T, Narita Y, Nishimura Y. An on-site audit system for dosimetry credentialing of intensity-modulated radiotherapy in Japanese Clinical Oncology Group (JCOG) clinical trials. Phys Med 2016;32:987-91.

Clark CH, Aird EG, Bolton S, Miles EA, Nisbet A, Snaith JA, et al. Radiotherapy dosimetry audit: Three decades of improving standards and accuracy in UK clinical practice and trials. Br J Radiol 2015;88:20150251.


Refbacks

  • There are currently no refbacks.


 

  https://e-rasaneh.ir/Certificate/22728

https://e-rasaneh.ir/

ISSN : 2228-7477