LOCALIZATION OF SUPERFICIAL CEREBRAL-LESIONS USING A MAGNETIC-RESONANCE IMAGING-GUIDED LOCALIZER

The localization of superficial cerebral lesions may be difficult even if they reach the surface of the cerebral cortex. Intraoperative ultr asound often fails to detect subcortical lesions. A localization devic e using multiplanar MR-imaging has been designed to project such lesio ns to the scalp. This device is a hood-shaped grid made of polyethylen e tubing filled with paramagnetic contrast agent. In this hemispherica l grid the tubes are arranged at a distance of 15 to 30 mm so that the MR-plane always slices perpendicular to the axis of the tubing and de picts a bright spot per tube. It is rapidly filled prior to each MR-ex amination, placed on the patient's head, and taped to his forehead to avoid unintentional displacement during and after the examination unti l the projection of the lesion is marked on the skin.