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A head immobilization system for radiation simulation, CT, MRI, and PET imaging
A F Thornton1, R K Ten Haken, K J Weeks
1University of Michigan Medical Center, Department of Radiation Oncology, Ann Arbor 48109.
Summary
A new aquaplast mask system provides precise head and neck immobilization for radiation therapy. This method ensures accurate patient positioning for CT, MRI, and PET scans, improving treatment consistency.
Area of Science:
- Medical Physics
- Radiotherapy Technology
- Medical Imaging
Background:
- Head and neck cancer treatment requires precise patient immobilization.
- Current methods may lack consistency or require multiple devices for simulation and treatment.
- Accurate image correlation between diagnostic and treatment imaging is crucial.
Purpose of the Study:
- To describe an aquaplast mask/marker immobilization system for head and neck radiation therapy.
- To evaluate the system's ability to facilitate image correlation across different imaging modalities.
- To assess the long-term positional accuracy of the immobilization system.
Main Methods:
- Utilized a commercially available thermoplastic mesh mounted to a rigid frame.
- Designed the system for use with CT, MRI, and PET diagnostic scans.
- Verified immobilization accuracy through weekly simulations over the course of treatment.
Main Results:
- The system allows diagnostic scans (CT, MRI, PET) in the same position as treatment.
- Patient treatment position movement was restricted to 3 mm over the treatment course.
- The constructed system demonstrated immobilization comparable to vacuum-forming techniques.
Conclusions:
- The described aquaplast mask system offers effective and reproducible immobilization for head and neck radiation therapy.
- It facilitates accurate image correlation by enabling scans in the treatment position.
- The system is easily constructed, rapid to fabricate, and provides high-precision immobilization.