Whole-brain radiation therapy without a thermoplastic mask

Janita Dekker, Tom Rozema, Florian Böing-Messing, Martha Garcia, Deniece Washington, Willy de Kruijf, Janita Dekker, Tom Rozema, Florian Böing-Messing, Martha Garcia, Deniece Washington, Willy de Kruijf

Abstract

The aim of the study was to investigate the clinical feasibility of whole-brain radiation therapy without a thermoplastic mask. Positioning and intra-fractional motion monitoring were performed using optical surface scanning. The motion threshold was 3 mm/3 degrees. The group mean vector deviation was 1.1 mm. The roll was larger compared to pitch and rotation. Two patients out of 30 were not able to lie still. All other patients completed their treatment successfully without a mask. With a probability of success of 93%, we concluded that irradiation without a mask is a clinically feasible method.

Keywords: Intra-fractional motion; Optical surface scanning; Real-time monitoring; Whole-brain radiation therapy.

Conflict of interest statement

None.

© 2019 The Authors.

Figures

Fig. 1
Fig. 1
The mean per patient, together with the median, the 25%–75% interval and the 5%–95% interval are given in the boxplot of the vector deviation per patient. Note that patient 6 used a head mask during all five fractions and patient 7 completed fraction 1 and 2 without a head mask and the remaining fractions with a mask. The results for treatments fractions with a mask are not included.

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