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Comparison of registration errors between previous registration methods and our MDPET over Gate 1, Gate 3, and Gate 6 at kidney, liver, and pancreas regions. From top to bottom: without registration, VM [9], NRB [40], SAN [37], and our MDPET. Using NRB and VM, misalignment errors can be found in spine region at gate 6 (red arrows), and additional misalignment errors are introduced in kidney, liver and pancreas regions at Gate 3 (blue arrows).
