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Evaluation of Novel Open Face Intracranial Immobilization Devices

D Wiant

D Wiant*, J Maurer , H Liu , L Hayes , B Sintay , Cone Health Cancer Center, Greensboro, NC


SU-E-T-396 (Sunday, July 12, 2015) 3:00 PM - 6:00 PM Room: Exhibit Hall

Purpose: Focal intracranial treatments, such as stereotactic radiosurgery, require that motion be minimized during treatment. This level of immobilization is typically achieved with custom thermoplastic masks that cover the patient’s face. These masks they do not allow active monitoring of patient position during treatment, and in many cases they induce claustrophobia and anxiety. This work evaluates potential motion using a newly developed faceless mask system designed to reduce anxiety and allow intrafraction monitoring.
Methods: Custom masks were created for five healthy volunteers using both the standard mask and the mask with integrated bite system (IBS). Each volunteer was monitored with surface imaging system for 15 minutes to evaluate physiological motion. They were then asked to move as much as possible to evaluate forced motion. The real time surface imaging information was recorded and analyzed off-line.
Results: The mean root-mean-square (RMS) of the linear displacements over the 15 minute monitoring periods ranged from 0.3 mm – 0.7 mm with the standard mask and 0.3 mm – 0.5 mm for the mask with IBS. The maximum individual variance was 0.4 mm (2 standard deviations) both with and without IBS. The maximum RMS displacement during forced movements was 9.2 mm without IBS and 4.9 mm with IBS. The mean RMS difference in position before and after forced motion over all patients and movements (with and without IBS) was 0.5 mm +/- 0.5 mm (2 SD), i.e. the volunteers were returning to within 0.5 mm of their initial position after forced movements.
Conclusion: The intracranial mask system is able to provide sub-millimeter immobilization for resting volunteers, and the system can limit motion to < 5 mm under the adverse conditions, providing adequate immobilization for any type of intracranial treatment while potentially improving patient comfort and reducing anxiety and claustrophobic episodes

Funding Support, Disclosures, and Conflict of Interest: This work was partially supported by Qfix.

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