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A PhD researcher developed the Motion Capture Pillow (MCP), an optical tactile sensor system designed to track head motion during radiotherapy. Current ceiling-mounted cameras face occlusion problems when patients enter treatment tunnels, and nose trackers only capture translational motion. The MCP sits beneath the patient's head, using a fibrescope, optical flow tracking, and grayscale imaging to capture both translational and rotational motion without ferromagnetic components. Key contributions include optimizing marker density on a deformable rubber sheet, integrating a gyroscope with Kalman filtering for sensor fusion, and a participatory design study with clinicians. Clinicians were receptive but raised concerns about accuracy and adoption. Future work focuses on stabilizing the pneumatic pressure control system, collecting more participant data, and improving fibrescope resolution.

Developing an optical tactile sensor for tracking head motion during radiotherapy: an interview with Bhoomika Gandhi