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Evaluation of exit skin dose for intra-cavitary brachytherapy treatments by the BEBIG 60Co machine using thermoluminescent dosimeters

Published online by Cambridge University Press:  16 January 2020

Mina Marvi ,
Somayeh Gholami Open the ORCID record for Somayeh Gholami [Opens in a new window] ,
Mehdi Salehi Barough ,
Mojtaba Hosseini ,
Mansooreh Nabavi ,
Ramin Jaberi  and
Alireza Mohammadkarim
Mina Marvi
Affiliation:
Department of Medical Radiation Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran
Somayeh Gholami*
Affiliation:
Radiation Oncology Department, Cancer Institute, Tehran University of Medical Sciences, Tehran, Iran
Mehdi Salehi Barough
Affiliation:
Department of Medical Radiation Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran
Mojtaba Hosseini
Affiliation:
Department of Medical Radiation Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran
Mansooreh Nabavi
Affiliation:
Radiation Oncology Department, Cancer Institute, Tehran University of Medical Sciences, Tehran, Iran
Ramin Jaberi
Affiliation:
Radiation Oncology Department, Cancer Institute, Tehran University of Medical Sciences, Tehran, Iran
Alireza Mohammadkarim
Affiliation:
Department of Medical Physics, Semnan University of Medical Sciences, Semnan, Iran
*
Author for correspondence: Somayeh Gholami, Radiation Oncology Department, Cancer Institute, Tehran University of Medical Sciences, Tehran, Iran. E-mail: s-gholami@sina.tums.ac.ir
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Abstract

Purpose:

This study aims to evaluate the application of the exit skin dose (ESD) in verifying the accuracy of intra-cavitary brachytherapy treatments performed by the BEBIG 60Co machine using thermoluminescent dosimeters (TLDs).

Materials and methods:

Eleven patients who were treated for gynaecological (GYN) malignancy by high-dose-rate (HDR) brachytherapy machine have been considered in this study. A combination of tandem, cylinder and interstitial needles was applied for eight patients while tandem ovoid (TO) applicators were used for the rest (three patients). In order to measure ESD, thermoluminescent dosimetry was performed for each patient. TLDs were placed precisely on the patient’s skin along her symphysis pubis bone (anterior) and left (L)/right (R) sides of her pelvic. Positioning of the dosimeter was accurately determined using fiducial markers in computed tomography (CT) scan imaging, prior to the treatment. Finally, a comparison was made between the calculated dose from the treatment planning system (TPS) and the dose measured by TLDs.

Results:

About 90% of all cases showed a good agreement (while considering TLD uncertainty ∼5·5%) between TPS dose calculations and TLD measurements. The measured mean values of ESD received to anterior, left and right positions were 56·72, 12·18 and 12·82 cGy, respectively. For three patients, differences up to 11·9% were detected.

Conclusion:

To conclude, ESD measurement method can be a suitable practical approach for verifying the accuracy of GYN HDR treatment delivery.

Keywords

BEBIG 60Co machineintra-cavitary brachytherapyTLD dosimetry
Type
Original Article
Information
Journal of Radiotherapy in Practice , Volume 20 , Issue 1 , March 2021 , pp. 49 - 54
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Copyright
© The Author(s), Tehran University of Medical Sciences, 2020. Published by Cambridge University Press

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