Imaging of diseased beta cells Visualization of the beta cells by a highly specific radiotracer with which high target-to background ratios can be obtained would benefit preoperative visualization of IPPNET in patients with AHH. Reliable visualization of diseased beta cells would then benefit the optimization of treatment of patients with AHH. An innovative method for imaging of beta cells could allow to optimally guide surgical interventions In addition, this novel approach could lead to a minimization of side-effects from the treatment.