Swivel gantry for multi-modal imaging systems

A PET/CT imaging system, comprising:

• a fixed gantry which defines a bore configured to receive a subject for imaging and includes:
• an x-ray source mounted in the fixed gantry and configured to emit x-rays into the bore;
• and
• an x-ray detector configured to detect x-rays from the x-ray source that have traversed the bore, the detector being mounted in the fixed gantry adjacent the bore;
• a swivel gantry connected to the fixed gantry by at least three mounting points the swivel gantry includes:
• a ring of PET detectors configured to detect gamma photons emitted by a radiopharmaceutical in the subject;
• and
• at least three mounting points including a hinge, the swivel gantry being configured to swivel at the hinge between a first position in the bore for PET or combined PET/CT imaging and a second position outside of the bore.