Exploratory Study Using a New Head-only PET Scanner

The \"BPET prototype\" is a small aperture PET scanner. The BPET prototype will be used with patients, which have just finished their regularly scheduled PET examination on a clinical whole body PET system. The radioactive tracer used for this procedure will still be active. This remaining acitivity will be used for an image acquisition with the BPET prototype without the need for an additional radioactive tracer dose. The control intervention is be a brain PET scan as part of standard clinical routine. It will be done immediately before the scan on the BPET prototype.