Clinical Proof-of-principle of the Determination of the Beta Cell Mass in Vivo by SPECT Imaging With the 111-In-labeled GLP-1 Analogue DTPA(Diethylenetriamine Pentaacetic Acid)-[K40]-Exendin 4

The purpose of the study is to determine whether there are differences in pancreatic uptake of the radiotracer between healthy individuals and patients with type 1 diabetes. If T1D patients have a markedly reduced uptake, the compound may be suitable for estimation of pancreatic beta cell mass, i.e. the cells in the pancreas that produce insulin.