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The Remove-the-Mask Open-Source head and neck Surface-Guided radiation therapy system.
Youssef Ben Bouchta1, Mark Gardner1, Chandrima Sengupta1
1The University of Sydney, Camperdown, NSW 2050, Australia.
Physics and Imaging in Radiation Oncology
|February 8, 2024
Summary
The new Remove the Mask (RtM) Surface Guided Radiotherapy system offers accurate head and neck cancer treatment. This open-source system achieves sub-millimetre accuracy, meeting international guidelines for patient safety.
Area of Science:
- Medical Physics
- Radiotherapy Technology
- Image-Guided Interventions
Background:
- Surface Guided Radiotherapy (SGRT) for head and neck cancer presents challenges due to obstructions and non-rigid facial motion.
- Maintaining surface accuracy is crucial for effective radiotherapy delivery in this region.
Purpose of the Study:
- To develop and benchmark the Remove the Mask (RtM) SGRT system.
- To address specific challenges in head and neck cancer radiotherapy using an open-source solution.
Main Methods:
- Benchmarking the RtM SGRT system using a head phantom on a robotic motion platform.
- Assessing system accuracy in ten human volunteers using a commercial motion capture system for ground truth.
- Inducing unidirectional shifts and reproducing real head motion traces.
Main Results:
- The RtM SGRT system demonstrated a mean tracking error of -0.1 ± 0.4 mm for translations and 0.0 ± 0.2° for rotations.
- Similar accuracy was observed in head phantom measurements.
- Forced facial motion led to reduced tracking accuracy, while overall sub-millimetre accuracy was achieved.
Conclusions:
- The RtM SGRT system is a low-cost, easily buildable, and open-source solution.
- It achieves accuracy meeting international commissioning guidelines for radiotherapy.
- Its design facilitates the development of novel surface tracking techniques.
