A triangulation-based magnetic resonance image-guided method for transcranial magnetic stimulation coil positioning

Area of Science:

• Neuroscience
• Medical Imaging
• Neuromodulation

Background:

• Transcranial Magnetic Stimulation (TMS) is utilized in cognitive research and psychiatric treatment.
• Accurate TMS coil positioning is crucial due to cortical variability but is challenging.
• Current neuronavigation systems are sophisticated and costly.

Purpose of the Study:

• To develop a triangulation-based, MRI-guided method for manual TMS coil positioning.
• To utilize individual neuroimaging data for precise targeting.
• To enhance the accuracy and reproducibility of TMS coil placement.

Main Methods:

• Developed a novel triangulation-based MRI-guided method for manual TMS coil positioning.
• Used individual MRI data to define cortical targets.
• Evaluated spatial accuracy and reproducibility using functional MR activations in motor and parietal cortices.

Main Results:

• The MRI-guided method achieved a spatial accuracy of 10 +/- 3 mm (Euclidean distance).
• Method reproducibility across two operators was 6.7 +/- 1.4 mm (motor cortex) and 6.0 +/- 3.2 mm (parietal cortex).
• Functional MR activations confirmed the accuracy of coil placement for eliciting motor-evoked potentials.

Conclusions:

• The developed triangulation-based MRI-guided method offers improved accuracy and reproducibility for TMS coil positioning.
• This technique can be clinically valuable for assisting TMS coil placement.
• It provides a potentially more accessible alternative to existing sophisticated neuronavigation systems.