18F-FSPG PET/MRI or PET/CT Imaging of Cardiac Sarcoidosis or Inflammation

Inclusion Criteria:

   - Patient is ≥ 18 years old at the time of the scan

   - Patient with known or suspected cardiac sarcoidosis.

   - Patient is capable of complying with study procedures

   - Patient can remain still for duration of imaging procedure

Exclusion Criteria:

   - Patient is pregnant or nursing

   - Metallic implants (contraindicated for MRI)

   - History of renal insufficiency (only for MRI contrast administration)