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Abstract #5205

Spatial Distortion from Leksell G-frame for Stereotactic Neurosurgery at 1.5T and 3T

Kiran K Seunarine1, Martin M Tisdall2, and Enrico De Vita1
1Physics Group, Department of Radiology, Great Ormond Street Hospital NHS Foundation Trust, London, United Kingdom, 2Department of Neurosurgery, Great Ormond Street Hospital NHS Foundation Trust, London, United Kingdom

Synopsis

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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Keywords