Extra- and intrahepatic visibility and unique detectibility.

The extra- and intrahepatic activity distribution is represented by hot spheres in a cold and warm background, respectively. For each image, the diameters (mm) of the first ‘mean-based’ visible and uniquely detectable spheres are given, followed by the diameters of the ‘median-based’ results in brackets. ‘X’ means that none of the spheres were uniquely detectable.