Multimodality localization of epileptic foci

Manuel Desco; Javier Pascau; M A Pozo; Andres Santos; Santiago Reig; Juan D. Gispert; Pedro Garcia-Barreno

doi:10.1117/12.428158

21 May 2001 Multimodality localization of epileptic foci

Manuel Desco, Javier Pascau, M A Pozo, Andres Santos, Santiago Reig, Juan D. Gispert, Pedro Garcia-Barreno

Proceedings Volume 4321, Medical Imaging 2001: Physiology and Function from Multidimensional Images; (2001) https://doi.org/10.1117/12.428158
Event: Medical Imaging 2001, 2001, San Diego, CA, United States

Abstract

This paper presents a multimodality approach for the localization of epileptic foci using PET, MRI and EEG combined without the need of external markers. Mutual Information algorithm is used for MRI-PET registration. Dipole coordinates (provided by BESA software) are projected onto the MRI using a specifically developed algorithm. The four anatomical references used for electrode positioning (nasion, inion and two preauricular points) are located on the MRI using a triplanar viewer combined with a surface-rendering tool. Geometric transformation using deformation of the ideal sphere used for dipole calculations is then applied to match the patient's brain size and shape. Eight treatment-refractory epileptic patients have been studied. The combination of the anatomical information from the MRI, hipoperfusion areas in PET and dipole position and orientation helped the physician in the diagnosis of epileptic focus location. Neurosurgery was not indicated for patients where PET and dipole results were inconsistent; in two cases it was clinically indicated despite the mismatch, showing a negative follow up. The multimodality approach presented does not require external markers for dipole projection onto the MRI, this being the main difference with previous methods. The proposed method may play an important role in the indication of surgery for treatment- refractory epileptic patients.

Citation Download Citation

Manuel Desco, Javier Pascau, M A Pozo, Andres Santos, Santiago Reig, Juan D. Gispert, and Pedro Garcia-Barreno "Multimodality localization of epileptic foci", Proc. SPIE 4321, Medical Imaging 2001: Physiology and Function from Multidimensional Images, (21 May 2001); https://doi.org/10.1117/12.428158

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