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Moreover, it has been argued that MEG is a less stressful neuroimaging method than others. Colon, Ossenblok, Nieuwenhui, Stam, and Boon (2009) stated that MEG presented no risk in triggering seizures, and that MEG was easier for patients and hospitals. This may be because MEG procedure simply involves the patient wearing a helmet and keeping still, whereas many electrodes must be fitted to the patients scalp for EEG. Thus is seems epileptics may feel more comfortable in this environment possibly making MEG a better method of treatment for patients. However, whist MEG may be more relaxing for the patient as they are simply wearing a helmet, any head movement can skew results that have been recorded.During MEG patients must keep their head …show more content…
Unlike positron emission tomography (PET), MEG does not involve anything entering the patient’s body. Minassian, Otsubo, Weiss, Elliott, Rutka and Snead (1999) used invasive EEG to determine the locations of epileptic spikes in 11 epileptic children. They found that MEG located the same abnormal discharges in 10 of the children. This suggests that MEG is a reliable source for localizing epileptiform sources, and so is more patient friendly procedure because patients do not require any incisions to access the brain surface like they do for invasive EEG. Invasive EEG is frequently used to aid surgery in epileptics, therefore MEG should be considered as a consistent, more comforting alternative that can assist surgery in epileptics. However, the importance in identifying epileptogenic responses is far greater than patient …show more content…
However, radial currents cannot be measured accurately because of the dipole orientation and direction, therefore producing no magnetic field outside the head. Deep structures are also hard to detect using MEG. Mikuni et al. (1997) examined a 30-year-old woman who had complex seizures since she was 13. A 25-minute EEG recording revealed 217 epileptiform responses located at the mesial temporal lobe. They found that MEG only localized 40 of these unusual post-synaptic potentials. Further support comes from Goldenholz et al (2009) investigated the signal to noise ratio (SNR) from different sources in 4 subjects. A higher SNR was detected using MEG, however much lower SNR was found for deeper sources. The opposite was true for EEG. These findings can be explained due to potential insufficient coverage of the helmet to deeper parts of the brain, thus few magnetic signals can be detected. Also, the shape of epileptogenic regions, such as the hippocampus is not circular; therefore if the spherical model is fitted then this may produce discrepancies between the data. Therefore, MEG use in treating epilepsy can be effective, if epileptogenic regions are near the surface and discharges are non-radial, but if not, MEG may not be optimal in aiding

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