Fig. 2 Example of comparison of ESI, PET and iSPECT before surgery. (A) 256-channel ESI found the source maximum (red) in left lateral temporal lobe. (B) PET showed hypometabolism of the entire left temporal lobe, which extends to the occipital lobes. (C) Extensive hyperperfusion of left temporal and occipital lobe, but also posterior insula, was seen in iSPECT. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)