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Introducing navigated transcranial magnetic stimulation as a refined brain mapping methodology.
T Krings1, K H Chiappa, H Foltys
1University Hospital of the Technical University of Aachen, Interdisciplinary Center of Clinical Research, Central Nervous System, Germany. tkrings@izkf.rwth-aachen.de
Neurosurgical Review
|January 10, 2002
Summary
Navigated transcranial magnetic stimulation (TMS) precisely maps brain function by integrating magnetic resonance imaging (MRI) with neuronavigation. This technique accurately relates scalp stimulation to cortical anatomy, improving brain mapping reliability.
Area of Science:
- Neuroscience
- Medical Imaging
- Neurology
Background:
- Transcranial magnetic stimulation (TMS) is limited by an unclear relationship between coil position and stimulated cortex, hindering accurate brain mapping.
- Establishing a clear link between brain structure and function is crucial for effective brain mapping modalities.
Purpose of the Study:
- To refine TMS by integrating magnetic resonance imaging (MRI) and neuronavigation for precise coil positioning and cortical mapping.
- To enhance the accuracy of assessing the relationship between scalp stimulation sites and underlying cortical anatomy.
Main Methods:
- Utilized a neuronavigation system to combine TMS with MRI data.
- Employed real-time visual guidance to maintain constant coil position on the scalp.
- Mapped coil positions onto MRI datasets to establish precise anatomical localization.
Main Results:
- Accurately assessed the relationship between cortical anatomy and scalp stimulation sites for higher cortical functions.
- Enabled precise measurement of coil position using real-time visual feedback.
- Facilitated the generation of cortical motor output maps for surgical planning, particularly for lesions near the rolandic cortex.
Conclusions:
- Navigated TMS offers a reliable method for localizing cortical functions.
- This technique serves as a valuable adjunct or alternative to existing functional neuroimaging methods.
- Improved precision in TMS enhances its utility in clinical applications and research.