Phantom-Enhanced High Mechanical Accuracy for Frame-Based Deep Brain Stimulation.

Area of Science:

• Neurosurgery
• Neurological Devices
• Medical Imaging and Image-Guided Therapy

Background:

• Deep brain stimulation (DBS) requires precise electrode placement for therapeutic efficacy in conditions like Parkinson's disease.
• Inaccurate electrode positioning can lead to suboptimal treatment outcomes and increased side effects.
• Existing targeting methods exhibit variability, necessitating improvements in surgical accuracy.

Purpose of the Study:

• To evaluate the accuracy of a stereotactic phantom-based technique for pre-surgical electrode targeting in DBS.
• To quantify targeting errors and assess the potential for error minimization before brain implantation.

Main Methods:

• A stereotactic phantom was used to test and adjust targeting for 91 sequential DBS electrodes.
• A to-target cannula with an XY stage allowed for real-time adjustments and error correction.
• Calculations were developed to convert planning station angles to spherical coordinates for trajectory planning and error analysis (Euclidean, radial, dimensional).

Main Results:

• All 91 electrodes' initial tracks successfully traversed the intended target.
• The technique achieved ultra-high (0-0.5 mm) to high (>0.5-1 mm) accuracy.
• Average Euclidean error was 0.66±0.30 mm, radial error was 0.45±0.28 mm, with dimensional errors <0.5 mm per axis.

Conclusions:

• The stereotactic phantom technique significantly enhances pre-surgical targeting accuracy for DBS electrode placement.
• This method provides a reliable tool for error assessment and correction, improving mechanical accuracy.
• Further research should focus on minimizing errors and correlating mechanical accuracy with clinical outcomes.