Related Experiment Videos
Methodological and technical issues for integrating functional magnetic resonance imaging data in a neuronavigational
F E Roux1, D Ibarrola, M Tremoulet
1Institut National de la Santé et de la Recherche Médicale, Unité 455, Federation of Neurosurgery, Hôpitaux Purpan and Rangueil, F-31059 Toulouse, France. rouxfran@compuserve.com
Neurosurgery
|February 16, 2002
Summary
Functional magnetic resonance imaging (fMRI) aids brain tumor surgery planning and guides motor cortex stimulation. However, potential functional mislocalization requires careful data registration and threshold adjustments for accurate surgical navigation.
Area of Science:
- Neurosurgery
- Medical Imaging
- Neurology
Background:
- Functional magnetic resonance imaging (fMRI) is increasingly used for surgical planning.
- Integrating fMRI data into frameless stereotactic devices presents technical challenges.
- Accurate intraoperative brain mapping is crucial for neurosurgical procedures.
Purpose of the Study:
- To analyze technical and methodological issues of using fMRI data in frameless stereotactic surgery.
- To evaluate fMRI accuracy for brain tumor surgery and chronic motor cortex stimulation.
Main Methods:
- 32 patients underwent fMRI scanning (61 procedures) and intraoperative cortical brain mapping under general anesthesia.
- fMRI data were analyzed using Statistical Parametric Mapping 99 software.
- fMRI data were registered into a frameless stereotactic neuronavigational device for correlation with brain mapping.
Main Results:
- Good correspondence (87%) between fMRI-activated and mapped primary motor areas was observed.
- fMRI accuracy was dependent on paradigm choice and analysis thresholds.
- Functional mislocalization occurred in 13% of patients due to echo-planar distortion; stricter thresholds were often needed.
Conclusions:
- fMRI data are valuable for surgical planning and intraoperative guidance in brain tumor surgery.
- Registration of fMRI data in stereotactic devices can be a source of functional mislocalization.
- fMRI is a promising tool for chronic motor cortex stimulation, potentially replacing somatosensory evoked potentials for central sulcus detection.