[A Study on LINAC Couch Position for Brain Stereotactic Radiotherapy Using High-definition Optical Surface Imaging...

Area of Science:

• Medical Physics
• Radiotherapy Technology
• Image Guidance Systems

Context:

• Non-coplanar radiotherapy involves complex patient positioning with couch and gantry rotations.
• Accurate patient alignment is critical for effective radiation delivery and minimizing off-target exposure.
• Existing surface imaging systems require validation for non-coplanar treatment scenarios.

Purpose:

• To evaluate the detection accuracy of a high-definition optical surface imaging (OSI) system, Catalyst HD (CHD), for non-coplanar radiotherapy.
• To assess the constancy, reproducibility, and accuracy of the CHD system's positioning detection during phantom rotations simulating non-coplanar setups.

Summary:

• The Catalyst HD (CHD) system demonstrated high accuracy in detecting phantom positions during simulated non-coplanar rotations.
• Constancy tests showed minimal isocenter variation (max Rot. 0.02°, max Dev. 0.20 mm).
• Reproducibility and accuracy tests confirmed reliable performance within acceptable clinical margins, even with couch rotations up to ±0.5°.

Impact:

• The high-definition OSI system is validated as a valuable tool for precise patient positioning in non-coplanar radiotherapy.
• This technology can enhance treatment accuracy and safety in complex radiotherapy delivery techniques.
• Findings support the integration of advanced surface imaging for image-guided adaptive radiotherapy.