Fig 6. Clinical implications of the PSF: the dotted curves depict the pixel value of a single electrode contact through the center. Summation of these curves renders a curve (black line). When the distance between 2 electrodes is larger than FWHM, the resulting curve still shows 2 maximum values, and the electrode contacts can be separated in the image (A). If the distance between 2 electrode contacts is smaller than FWHM, the resulting curve shows a single peak; the electrode contact cannot be visualized separately (B).