Fig. 2From: Head-to-head comparison of image quality between brain 18F-FDG images recorded with a fully digital versus a last-generation analog PET cameraSchematic representations of methods used on axial 18F-FDG brain PET images to a quantify the contrast between central (striata) or peripheral (occiput) gray-matter structures and a white matter structure (semi-oval center), b determine the sharpness index through the maximal slope of count profiles obtained perpendicularly to the gray/white-matter interfaces of striata and occiput and further normalized to the maximal curve value, and c quantify the noise level within the semi-oval areaBack to article page