Fig. 10From: Design and implementation of a prototype head and neck phantom for the performance evaluation of gamma imaging systemsPlanar HGC gamma images for the two simulated, superficial SLNs (0.1 and 0.2Â MBq) at an 80Â mm collimator-to-surface distance utilising both pinhole collimators (0.5 and 1.0Â mm diameter); the acquisition time varied between 10 and 300Â sBack to article page