Laser-based Photoacoustic Tomography of Human Inflammatory Arthritis

Inclusion Criteria: * Men and women 18 years of age or older can participate in this study. * Patients can participate in this study if they have had rheumatoid arthritis for more than 2 years and their rheumatologist has referred them to this study. * Patients can participate as a healthy volunteer with a known history of rheumatoid arthritis. Exclusion Criteria: * Patients, who have electrically, magnetically or mechanically activated implants such as heart pacemaker, magnetic surgical clips, prostheses or implanted neurological stimulator. * Pregnant patients. * Patients who is claustrophobic. * Patients with impaired renal function cannot participate in this study such as elevate creatinine clearance, patients on kidney dialysis etc. * Patients with shock hypotension or unstable low blood pressure. * Patients with Rhabdomyolysis. * Patients who have had a contrast enhanced (with gadolinium) MRA (magnetic resonance angiography)/ or MRI within the last 3 months. (Contrast is a medication injected into a vein during a imaging examination that helps produce clearer images/pictures).