A PH I Pilot Imaging Study to Evaluate Molecular Imaging Methods in HVs and pSS Pts

Inclusion Criteria: * GROUP A: Healthy Volunteers Subjects for both PET/CT and MRI: Aged \>=40 years inclusive at the time of signing the informed consent. Subjects for MRI, without PET/CT: Aged \>=30 years inclusive at the time of signing the informed consent Healthy as defined by the investigator, or medically qualified designee, based on a medical evaluation including medical history, physical examination, and laboratory tests. * Group B: Primary Sjögren's Syndrome Patients Age \>=30 years, at the time of signing the informed consent. Diagnosis of pSS according to the American-European Consensus Group criteria Baseline unstimulated salivary flow \>0.0 mL/min or evidence of glandular reserve function (stimulated baseline salivary flow \>0.05 mL/min). Systemically active disease, ESSDAI \>=5 points * All Subjects Body weight \>=50 kilogram (kg) and body mass index within the range 18.5 to 35 kg/m\^2 (inclusive) Male or Female, where one of the following conditions apply: A female subject is eligible to participate if she is not pregnant (as confirmed by a negative serum human chorionic gonadotrophin test) at screening, and a negative urine pregnancy test 4-7 days prior to Visit 1, on the day of Visit 1 (on each day of scanning), on Visit 2, is not lactating, and at least one of the following conditions applies: non-reproductive potential or reproductive potential and agrees to use contraceptive methods listed in the protocol from 28 days prior to Visit 1 until follow …