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Cdevices, has been determined yet. It is also unclearwhether intraoperative MRI is applicable only for tumor resection control or if it is relevant for any other neurosurgical procedure. To realize the potential benefits of intra-operative MRI, one has to understand all the possible implications of this new approach. In much morphologic information it is necessary to correct for these deformations. With these data, we can answer one of the fundamental questions of image-guided neurosurgery, that is, whether elaborate and frequently repeated intraoperative imaging is necessary or if computer simulations supplemented by some intraoperative measure-