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Fig 1. Cerebral perfusion in a 13-year-old boy with a history of seizures. Ictal study following injection of 1.258 GBq (34 mCi) Tc99m-ECD. The image shows a focus of increased uptake in the left frontal lobe (arrows) suggestive of a seizure focus. The photopenic area in the left posterior parietal lobe corresponds to a large cyst previously identified on MR imaging. The increased uptake focus is hardly recognizable in the projection data (bottom right).
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