Image-guided robotic radiosurgery

Area of Science:

• Medical Physics
• Neurosurgery
• Radiation Oncology

Background:

• Current stereotactic radiosurgery relies on rigid cranial fixation.
• Stereotactic frames cause patient discomfort and limit treatment options.
• Framed systems are difficult to apply to targets outside the cranium.

Purpose of the Study:

• To introduce and evaluate a novel frameless image-guided radiosurgery (IGR) system.
• To demonstrate IGR's potential to overcome limitations of traditional stereotactic techniques.
• To describe the design, performance, and preliminary clinical experience of the IGR system.

Main Methods:

• IGR utilizes an x-band linear accelerator, a robotic arm, and orthogonal x-ray imagers.
• Rapid image-to-image registration and real-time target tracking are employed.
• The system adjusts the linear accelerator beam to maintain alignment with the target.

Main Results:

• Early prototypes demonstrated accurate 3D tracking but needed improvement for rotational movements.
• Enhanced tracking algorithms were developed to address rotational inaccuracies.
• Upgraded x-ray imaging technology improved resolution and sensitivity for extra-cranial targets.

Conclusions:

• The frameless IGR system shows promise for improving radiosurgery.
• IGR offers a more comfortable and versatile treatment option compared to framed systems.
• Ongoing development aims to expand IGR applicability to a wider range of targets.