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A high-precision system for conformal intracranial radiotherapy
W A Tome1, S L Meeks, J M Buatti
1Department of Human Oncology, University of Wisconsin Medical School, Madison, WI, USA.
Summary
An optically guided system enhances precision in 3D conformal radiotherapy, improving patient setup accuracy for better treatment outcomes. This technology minimizes setup uncertainty, allowing for more targeted radiation delivery and improved normal tissue sparing.
Area of Science:
- Medical Physics
- Radiation Oncology
- Image-Guided Therapy
Background:
- Stereotactic radiosurgery and fractionated stereotactic radiotherapy offer optimal precision for intracranial radiotherapy.
- Accurate patient positioning is crucial for effective radiotherapy delivery.
Purpose of the Study:
- To report on an optically guided system for precise three-dimensional (3D) conformal radiotherapy.
- To evaluate the system's efficacy using multiple noncoplanar fixed fields.
Main Methods:
- An optical system using infrared light-emitting diodes (IRLEDs) on a bite plate monitors patient position via a stereo camera system.
- Patient position is determined relative to a reference isocenter, allowing direct adjustment in stereotactic space.
- 3D conformal treatment plans are designed using imported image data and established patient positions.
Main Results:
- The optically guided system enables the creation of highly conformal treatment plans with excellent dose homogeneity and steep dose gradients.
- This approach has been successfully applied to treat 28 patients.
Conclusions:
- Infrared light-emitting diode (IRLED) technology enhances patient localization accuracy and real-time position monitoring.
- This allows for reduced treatment margins, accounting only for beam penumbra and image resolution.
- The system improves normal tissue sparing and the conformality and homogeneity of 3D conformal radiotherapy.