Abstract
Anatomical interpretation of EEG and MEG derived source estimations is difficult, and their correspondence with pathology as revealed by medical images is hard to assess. In this study a method is presented to register electromagnetic source data with tomographic image data of the same patient, thus facilitating the interpretation of the dipole characteristics with respect to the patient's anatomy (MRI, CT) or metabolism (SPECT). The method utilizes external triangular markers that are easy to apply to the skin and indicate reference points with subslice accuracy, even if these are located slightly outside the scanned volume. In this way accurate matching is ensured not only in high resolution images but also in standard CT and MR imaging protocols employing thick slices and/or large interslice gaps. While a similar triangular marker can be used for SPECT imaging, point-like radioactive markers have been considered as well because of their simplicity. At present no final conclusions can be drawn about the optimal design of the SPECT marker. The clinical potential of dipole source modelling in epilepsy and other neurological applications has not yet been established, mainly because the accuracy of the source estimations is still uncertain. The registration method proposed in this paper is much more accurate than the present-day source estimations, and hence will keep its value when improved dipole models are developed.
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Barth DS, Sutherling W, Engle Jr J and Beatty J (1984). Neuromagnetic evidence of spatially distributed sources underlying epileptiform spikes in the human brain. Science 223:293–296.
Barth DS, Baumgartner C and Sutherling WW (1989). Neuromagnetic field modeling of multiple brain regions producing interictal spikes in human epilepsy. Electroenceph. Clin. Neurophysiol. 73:389–402.
Buchsbaum MS, Hazlett E, Sicotte N, Ball R and Johnson S (1986). Geometric and scaling issues in topographic electroencephalography. In: Topographical mapping of brain electrical activity. Duffy FH (Ed.), Butterworth Publishers, Stoneham, pp. 325–337.
Chang H (1990). Geometric image transformation to compensate for distortions in magnetic resonance imaging. PhD Thesis, Vanderbilt University, Nashville, Tennessee.
De Munck JC (1989). A mathematical and physical interpretation of the electromagnetic field of the brain. PhD Thesis, University of Amsterdam, Amsterdam.
De Munck JC (1990). The estimation of time varying dipoles on the basis of evoked potentials. Electroenceph. Clin. Neurophysiol. 77:156–160.
Frank E (1952). Electric potential produced by two point current sources in a homogeneous conducting sphere. J. Appl. Phys. 23:1225–1227.
George JS, Jackson PS, Ranken DM and Flynn ER (1989). Three-dimensional volumetric reconstruction for neuromagnetic source localization. In: Advances in biomagnetism. Williamson SJ, Hoke M, Stroink G and Kotani M (eds.), Plenum Press, New York, pp. 737–740.
Gevins A, Brickett P, Costales B, Le J and Reutter B (1990). Beyond topographic mapping: towards functional-anatomical imaging with 124-channel EEGs and 3-D MRIs. Brain Topography 3:53–64.
Levoy M (1988) Display of surfaces from volume data. IEEE Computer Graphics and Applications 8–3:29–37.
Meijs JWH, Bosch FGC, Peters MJ and Lopes da Silva FH (1987). On the magnetic field distribution generated by a dipolar current source situated in a realistically shaped compartment model of the head. Electroenceph. Clin. Neurophysiol. 66:286–298.
Orrison WW, Davis LE, Sullivan GW, Mettler Jr FA and Flynn ER 1990). Anatomical localization of cerebral cortical function by magnetoencephalography combined with MR Imaging and CT. AJNR 11:713–716.
Pantev C, Hoke M, Lehnertz K, Lütkenhöner B, Fahrendorf G and Stöber U (1990). Identification of sources of brain neuronal activity with high spatiotemporal resolution through combination of neuromagnetic source localization (NMSL) and magnetic resonance imaging (MRI). Electroenceph. Clin. Neurophysiol. 75:173–184.
Salustri C and Chapman RM (1989). A simple method for 3-dimensional localization of epileptic activity recorded by simultaneous EEG and MEG. Electroenceph. Clin. Neurophysiol. 73:473–478.
Samson Y, Hantrage P, Baron JC, Soussaline F, Comar D and Maziëre M (1985). A benzodiazepine antagonist studied in human brain in vivo by positron tomography. Europ. Journal of Pharmacology 110:247–251.
Ueno S and Iramina K (1990). Modeling and source localization of MEG activities. Brain Topography 3:151–165.
Van der Meij W, Van Huffelen AC and Wieneke GH (1990). EEG mapping and dipole modelling of rolandic spikes. Neurophysiol. Clin. 20 S, 2s (Abstract).
Van Huffelen AC, Van Isselt JW, Van Veelen CWM, Van Rijk PP, Van Bentum AME, Dive D, Maquet P, Franck G, Velis DN, Van Emde Boas W and Debets RMChr (1990). Identification of the side of the epileptic focus with 123I-Iomazenil SPECT. Acta Neurochirurgica, Suppl. 50:95–99.
Weinberg H, Wong PKH, Crisp D, Johnson B and Cheyne D (1990). Use of multiple dipole analysis for the classification of benign rolandic epilepsy. Brain Topography 3:183–190.
Witwer JG, Trezek GJ and Jewett DL (1972). The effect of media inhomogeneities upon intracranial electrical fields. IEEE Trans. on Biomed. Engng. 19:352–362.
Wong PKH (1989). Stability of source estimates in rolandic spikes. Brain Topography 2:31–36.
Yamamoto T, Williamson SJ, Kaufman L, Nicholson C and Llinás R (1988). Magnetic localization of neuronal activity in the human brain. Proc. Natl. Acad. Sci. USA 85:8732–8736.
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© 1991 Springer-Verlag Berlin Heidelberg
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van den Elsen, P.A., Viergever, M.A. (1991). Marker guided registration of electromagnetic dipole data with tomographic images. In: Colchester, A.C.F., Hawkes, D.J. (eds) Information Processing in Medical Imaging. IPMI 1991. Lecture Notes in Computer Science, vol 511. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0033749
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DOI: https://doi.org/10.1007/BFb0033749
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