Comparison of the estimated dose in the Rectum and Bladder with 3D versus 2D brachytherapy planning

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2019-04-30

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Puente Vallejo, R., Núñez Silva, C., Jaramillo Gómez, C., Zurita Vivero, K., De Los Reyes Morales, L., Défaz Gómez, Y., Collantes Cruz, V., García Navas, J., Pallaroso Yela, M., & Molineros Salgado, C. (2019). Comparison of the estimated dose in the Rectum and Bladder with 3D versus 2D brachytherapy planning. Oncology Journal (Ecuador), 29(1), 36–44. https://doi.org/10.33821/301

Issue

Vol. 29 No. 1 (2019): April- July

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Original Articles

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Copyright (c) 2019 Raúl Puente Vallejo, Cristina Núñez Silva, Carolina Jaramillo Gómez, Karina Zurita Vivero, Luis De Los Reyes Morales, Yolanda Défaz Gómez, Vladimir Collantes Cruz, Jorge García Navas, Maira Pallaroso Yela, Carlos Molineros Salgado

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This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

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Authors

  • Raúl Puente Vallejo Postgrado de radioterapia Universidad Central del Ecuador, Solca, Núcleo de Quito, Ecuador. https://orcid.org/0000-0002-0678-2571
  • Cristina Núñez Silva Hospital Solón Espinosa Ayala, Solca núcleo de Quito, Servicio de Radioterapia.
  • Carolina Jaramillo Gómez Hospital Solón Espinosa Ayala, Solca núcleo de Quito, Servicio de Radioterapia.
  • Karina Zurita Vivero Universidad Central del Ecuador, Departamento de postgrados, Postgrado de radioterapia. https://orcid.org/0000-0001-8309-4011
  • Luis De Los Reyes Morales Hospital Solón Espinosa Ayala, Solca núcleo de Quito, Servicio de Radioterapia. https://orcid.org/0000-0001-8838-9361
  • Yolanda Défaz Gómez Hospital Solón Espinosa Ayala, Solca núcleo de Quito, Servicio de Radioterapia.
  • Vladimir Collantes Cruz Hospital Solón Espinosa Ayala, Solca núcleo de Quito, Servicio de Radioterapia. https://orcid.org/0000-0002-4503-2386
  • Jorge García Navas Escuela Politécnica Nacional, Departamento de Postgrados, Maestría en física Médica.
  • Maira Pallaroso Yela Escuela Politécnica Nacional, Departamento de Postgrados, Maestría en física Médica.
  • Carlos Molineros Salgado Escuela Politécnica Nacional, Departamento de Postgrados, Maestría en física Médica. https://orcid.org/0000-0002-7959-2998

DOI:

https://doi.org/10.33821/301

Keywords:

BRACHYTHERAPY, CERVIX UTERI, UTERINE CERVICAL NEOPLASMS, COLON, RADIOTHERAPY, RADIOTHERAPY PLANNING COMPUTER-ASSISTED

Abstract

Introduction: In the treatment of Uterine Cervical Cancer brachytherapy (BQT) with three-dimensional planning (3D) is highly widespread, although for its cost other centers use BQT with two-dimensional planning (2D). It is important to establish if the benefit obtained with BQT in 3 D, in the protection of risk organs, is a determining factor for the change towards this new technology. The aim of the study is to compare the doses in both types of BQT in the organs adjacent to the uterus such as the colon and bladder.

Methods: The present descriptive study includes patients diagnosed with cervical cancer who received BQT in the period from January 2015 to December 2018, in the Radiotherapy service of the Hospital Solón Espinosa Ayala, Quito-Ecuador. The variables were the dose received with 2D and 3D plans. Histograms were obtained volume volume of the organs at risk: rectum and bladder. The averages are compared with Student's T.

Results: There were 44 cases, of 50.6 ± 13.8 years of age. In clinical stage IIB 24 cases (55%). The prescribed dose of BQT in the group was 683.6 ± 27 cGY. The type of applicator used was in the great majority AyT of 5 mm in 34 cases (77%). The majority of treatments consisted of therapies of 4 sessions 32 cases (73%), with 117 implants for BQT. The planned dose in 2D bladder was 5.5 Gy, versus 5.1 Gy in 3D, P = 0.01. The planned dose in rectum in 2D was 2.8 Gy; versus 3.0 Gy in 3D P = 0.06).

Conclusion: 3D planning significantly reduces 0.4 Gy the dose irradiated to the bladder. In the case of the rectum, the dose does not produce statistical changes with respect to 2D planning.

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