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A phantom study was carried out to investigate the accuracy of attenuation and scatter correction for cardiac scanning on the Discovery RX PET/CT in 2D and 3D modes. Methods: A body phantom (RSD/Alderson) containing heart, liver, lungs and skeleton was scanned with 18F in the “myocardium” and (a) with various concentrations of 18F in the liver (placed, alternately, mostly inside or outside the PET...