Dwell time in the uterus and vagina as a parameter to analyze the dose distribution in cervix carcinoma for brachytherapy with Co-60 source. Clinical cases.

Autores

  • Gustavo Piriz Hospital de Clinicas
  • Yolma A. Banguero Cátedra Oncologia Radioterápica, Hospital de Clínicas, Facultad de Medicina/Centro de Investigaciones Nucleares, Facultad de Ciencias. Universidad de la República
  • Arleth M. Pelaez Curso de Metodología Científica/ Licenciatura de Fisioterapia, Escuela Universitária de Tecnologias Medicas / Universidad de la República, Montevideo, Uruguay
  • Fernando J. Lema Instituto de Radiología y Centro de Lucha Conta el Cáncer/Centro Hospitalario Pereira Rossell, Montevideo, Uruguay
  • Alejandro DeRosa Instituto de Radiología y Centro de Lucha Conta el Cáncer/Centro Hospitalario Pereira Rossell, Montevideo, Uruguay
  • Aldo Quarneti Cátedra Oncologia Radioterápica/Hospital de Clínicas/Facultad de Medicina/Universidad de la República, Montevideo, Uruguay

DOI:

https://doi.org/10.29384/rbfm.2022.v16.19849001597

Palavras-chave:

Brachytherapy, dose distribution, intracavitary treatment, cervix neoplasm, optimization

Resumo

Intracavitary gynecological brachytherapy uses as a guideline for dose distribution, the ratio between the pear length in the three directions of the axes considers at ICRU 38. The ratios h/w, h/t function as a parameter to find out how the uterus and vagina are covered by the prescription dose. This work correlates these ratios with the dwell times inside the uterus (tu) and vagina (tv) expecting to identify these times as criteria for the dose shape distribution. We performed an optimized treatment planning for 120 sessions of 6.0 Gy each, following the recommendations of the ABS, ICRU 38, and 89. The planning system used is HDRplus 3.0.4 with an HDR Eckert y Ziegler BEBIG Co0.A86 brachytherapy unit with Cobalt 60. Considering the tandem time modulation and the time differences between left and right irradiation in the vagina, the variation of the correlation with the number of sessions for the tu/tv ratio with h/w and h/t was studied. A correlation has been found between tu/tv with h/w and h/t, which depends on the amount of data. There is a good correlation between the tu/tv ratio with h/w and h/t respectively, which is stronger for the first one.

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Referências

Niloy Ranjan Dattaa, Shaleen Kumara, Koilpillai Joseph Maria Dasa , Chandra Mani Pandeyb , Shikha Haldera , Sunder Ayyagari, Variations of intracavitary applicator geometry during multiple HDR brachytherapy insertions in carcinoma cervix and its in¯uence on reporting as per ICRU report 38 ; Radiotherapy and Oncology 60 (2001) 15-24.

Rajeev Shrivastava, Rahul B. Umbarkar, M. B. Sarje, K. K. Singh; Rectal dosimetry in intracavitary brachytherapy by HDR at rural center of Maharashtra: Comparison of two methods; Journal of Medical Physics., 2009, 34; 2, 93-6.

Nag S, Erickson B, Thomadsen B, Orton C, Demanes JD, Petereit D. The American Brachytherapy Society recommendations for high-dose-rate brachytherapy for carcinoma of the cervix. Int J Radiat Oncol Biol Phys. 2000 Aug 1;48(1):201-11.

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ICRU - International Commission on Radiation Units and Measurements. Dose and volume specification for reporting intracavitary therapy in ginecology, ICRU Report 38, Bethesda: ICRU, 1985. 24.

ICRU - International Commission on Radiation Units and Measurements. Prescribing, Recording, and Reporting Brachytherapy for Cancer of the Cervix, ICRU Report 89, Bethesda: ICRU, 2013. 234p 9. G Gonzalez-Sprinberg, G Piriz. SU-F-T-31: Shape and Isodose Distributions in Co60 HDR Brachytherapy for Different Utero‐Vaginal Time Ratios. Med Phys. 2016; 43(6, 12):3468.

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Publicado

2022-09-11

Como Citar

Piriz, G., Banguero, Y. A., Pelaez, A. M., Lema, F. J., DeRosa, A., & Quarneti, A. . (2022). Dwell time in the uterus and vagina as a parameter to analyze the dose distribution in cervix carcinoma for brachytherapy with Co-60 source. Clinical cases. Revista Brasileira De Física Médica, 16, 597. https://doi.org/10.29384/rbfm.2022.v16.19849001597

Edição

v. 16 (2022)

Seção

Artigo Original

Licença

Copyright (c) 2022 Gustavo Piriz, Yolma A. Banguero, Arleth M. Pelaez, Fernando J. Lema, Alejandro DeRosa, Aldo Quarneti

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