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Positron emission tomography (PET) according to β-value. Panel 1, original PET without noise reduction; Panels 2–7, PET noise reduction using the time-of-flight (TOF)-block sequential regularized expectation maximization (BSREM; Q.Clear®) method with increasing β-value. Of note, the blood pool noise can be dramatically reduced with a higher β value. Black arrows, strong 18F-fluorodeoxyglucose uptake around the pulmonary vein. OSEM, ordered subset expectation maximization.
