 Thirty-three patients, 18-85 years old and admitted with non-ST elevation myocardial infarction NSTEMI. After informed consent, patients wil receive standard, guideline-based clinical care that includes invasive coronary angiography. Plasma biomaker will be sampled serially, and a comprehensive Sodium 18F-Fluoride Positron Emission TomographyCardiac Magnetic Resonance imaging 18F-NaF PETCMR will be performed at baseline 72 hours and at 6 months, or earlier when patients suffer recurrent myocardial infarction 6months. Patients will be followed for one year during regular outpatient clinic visits. 