2.3. 18F-FDG PET/CT Protocol

All participants underwent ¹⁸F-FDG PET/CT after overnight fasting. Participants with AMI, all of whom were treated with percutaneous coronary intervention successfully, took ¹⁸F-FDG PET/CT within 10 days after AMI onset when they were clinically stable. The image acquisition was started 60 min after injection of 5.29 MBq/kg ¹⁸F-FDG using a dedicated PET/CT scanner (GEMINI TF, Philips Medical Systems, Cleveland, OH, USA), which is composed of a lutetium-yttrium oxyorthosilicate full-ring time-of-flight capable PET and 16-slice helical CT. The scanning range covered the area from the skull base to the proximal thigh. The CT scan was performed first for attenuation correction and localization (4 mm thickness; 120 kVp; 50mA). Immediately after the CT scan, the PET scan was performed for 9 bed positions at 1 min per bed position (4.4 mm spatial resolution with 18 cm axial field of view). All the PET images were reconstructed by the iterative algorithm (three-dimensional row-action maximum likelihood algorithm), using the CT-based attenuation maps.