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Evaluation of thermoplastic Klarity mask use during intensity-modulated radiation therapy for head and neck carcinoma

Published online by Cambridge University Press:  08 January 2018

Khaldoon Radaideh
Khaldoon Radaideh*
Affiliation:
Radiologic Technology Department, College of Applied Medical Sciences, Al-Qassim University, Buraydah, Saudi Arabia
*
†Correspondence to: Dr Khaldoon Radaideh, Radiologic Technology Department, College of Applied Medical Sciences, Al-Qassim University, P.O. Box 6699, Buraydah 51452, Saudi Arabia. Tel: 00966 54 733 2755. E-mail: [email protected]
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Abstract

Aim

To evaluate the Klarity® Mask with respect to skin doses and toxicity secondary to head and neck cancer radiation treatment.

Materials and methods

This prospective study included five nasopharyngeal cancer patients who underwent intensity-modulated radiation therapy and monitored for skin toxicity. An anatomical Perspex head and neck phantom was designed and used. All patients’ treatment plans were separately transferred to the phantom. Dosimetric measurements were performed using chip-shaped thermoluminescent dosimeters (LiF:Mg,Ti TLDs) which were distributed at certain target points on the phantom. Phantom was irradiated twicely with and without a Klarity® Mask. Three fractions for each patient plan were obtained and compared with treatment planning system (TPS) doses as guided by computed tomography.

Results

The Klarity mask used for patient immobilisation increased the surface dose by 10·83% more than that without the mask. The average variations between skin dose measurements with and without the Klarity mask for all patients’ plans ranged from 10·26 to 11·83%. TPS overestimated the surface dose by 19·13% when compared with thermoluminescent dosimeters that measured the direct skin dose.

Conclusions

Klarity immobilisation mask increases skin doses, as a consequence, surface dose measurements should be monitored and must be taken into account.

Keywords

anthropomorphic phantomdosimetryIMRTskin toxicityThermoplastic Klarity mask
Type
Original Article
Information
Journal of Radiotherapy in Practice , Volume 17 , Issue 2 , June 2018 , pp. 171 - 178
Copyright
© Cambridge University Press 2017 

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