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Evaluation of the surface dose for total body irradiation (TBI) technique with parallel-opposed anterior posterior geometry

Published online by Cambridge University Press:  09 March 2021

Hoseinnezhadzarghani Elham ,
Geraily Ghazale Open the ORCID record for Geraily Ghazale [Opens in a new window]  and
Sarvin Sarmadi
Hoseinnezhadzarghani Elham
Affiliation:
Department of Medical Physics and Medical Engineering, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
Geraily Ghazale*
Affiliation:
Department of Medical Physics and Medical Engineering, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran Radiotherapy Oncology Research Centre, Cancer Institute, Tehran University of Medical Sciences, Tehran, Iran
Sarvin Sarmadi
Affiliation:
Department of Orthodontics, School of Dentistry, Tehran University of Medical Science, Tehran, Iran
*
Author for correspondence: Geraily Ghazale, Department of Medical Physics and Medical Engineering, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran. E-mail: [email protected]
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Abstract

Aim:

Total body irradiation (TBI) is an external radiotherapy technique in which the whole body including the superficial regions is required to receive the therapeutic dose. The purpose of this study is to evaluate the received surface dose during TBI technique.

Methods and materials:

The anterior/posterior (AP/PA) TBI was implemented with 18-MV photon beam at 312-cm treatment distance for human-like phantom. The GAFCHROMIC-EBT3 films were used for superficial dose measurements.

Results and discussion:

The percentage of surface-absorbed dose relative to the prescription point for 8 points of measurements was between 102·78–121·48% and 104·51–127·43% at 5 and 10 mm depth, respectively. In the chest wall region due to the presence of lung blocks, the absorbed dose was below the acceptable level, so an electron boost was required to increase the chest wall absorbed dose.

Conclusions:

According to the results, the implemented technique was able to deliver sufficient dose to the shallow surface of phantom’s body.

Keywords

film dosimetrysurface dosetotal body irradiation
Type
Technical Note
Information
Journal of Radiotherapy in Practice , Volume 21 , Issue 4 , December 2022 , pp. 594 - 598
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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