 Adults between 50 and 75 years old diagnosed with RA will come in for an initial screening visit to assess for clinical eligibility criteria visit 1. During the screening period, patient acceptability for the study will be assessed on the basis of medical history, concomitant medications, physical examination, and clinical laboratory test results. The study doctor will review the screening test results and procedures to determine the subject eligibility prior to imaging. Women able to become pregnant will be excluded due to teratogenic side effects. 