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Title

Effect of Bolus Frequency and Its Thickness in Postmastectomy Three-dimensional Conformal Radiotherapy on Skin Dose for Superposition Algorithm

مجله فیزیک پزشکی ایران، دوره: 16، شماره: 6
Year: 1398
COI: JR_IJMP-16-6_002
Language: EnglishView: 174
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Authors

Karim BAHHOUS - ESMaR, Faculty of Science, Mohammed V University in Rabat, Rabat, Morocco
Mustapha ZERFAOUI - LPMR, Faculty of Science, University Mohamed ۱st, Oujda, Morocco
Naima EL KHAYATI - ESMaR, Faculty of Science, Mohammed V University in Rabat, Rabat, Morocco

Abstract:

Introduction: The postmastectomy radiotherapy uses bolus to improve the coverage close to the skin; however, it needs to be removed in case of severe skin toxicity. This study investigated the effect of bolus parameters (i.e., frequency and thickness) for the superposition algorithm on skin dose in postmastectomy three-dimensional conformal radiotherapy (3D-CRT). Material and Methods: The present study was carried out ona total of 22 patients. First, all the plans were calculated without using bolus. Then, the plans were recalculated using different bolus frequencies (5, 10, 15, 20, 25) and thicknesses (0.5 and 1 cm). To evaluate the dose delivered to the skin, a 2-mm thick skin was profiled, and statistical analysis was performed by studying the dosimetric parameters (i.e., minimum, mean, and maximum) of chest wall skin. Results: The superficial coverage of planning target volume (PTV) was better by using bolus. In the case of skin, the bolus thickness had a significant impact on the minimum and mean doses for all bolus frequencies , while there was no significant effect on the maximum before 20-bolus frequency. The bolus frequency increase demonstrated a significant difference on all dosimetric parameters of the skin , except the maximum showed no significant difference between 0 and 5-bolus frequencies . Conclusion: The obtained results indicated that the bolus use had generally a significant effect on the chest wall skin dosimetric parameters depending on bolus frequency and thickness. Therefore, the choice of bolus frequency and bolus thickness can affect the clinical decisions in certain cases.

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Paper COI Code

This Paper COI Code is JR_IJMP-16-6_002. Also You can use the following address to link to this article. This link is permanent and is used as an article registration confirmation in the Civilica reference:

https://civilica.com/doc/959771/

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BAHHOUS, Karim and ZERFAOUI, Mustapha and EL KHAYATI, Naima,1398,Effect of Bolus Frequency and Its Thickness in Postmastectomy Three-dimensional Conformal Radiotherapy on Skin Dose for Superposition Algorithm,https://civilica.com/doc/959771

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