Keywords: Epilepsy, Precision & Accuracy, StereotacticStereo electroencephalography (sEEG) is a valuable tool for localising seizure-onset zones in focal epilepsy. Pre-surgical planning typically combines CT images, which have little spatial distortion, with MRI images, which have improved cerebral tissue contrast. However, the use of CT results in a potentially unnecessary radiation dose to the patient and additional demand on radiology services. In this work, we assess the additional distortion caused by the stereotactic Leksell G-frame in a single healthy volunteer at both 1.5T and 3T. We show that distortion is <1mm in 99.6% of the brain volume at 3T.
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