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Registration performance associated with a cardiac-gating system in comparison to and in combination with the MSMR registration algorithm. The algorithm is found to improve registration beyond that achievable with a simple gating system—even in the case of systole trigger. Abbreviations: S–systole trigger group; D–diastole trigger group; S+D–pooling of systole and diastole trigger groups; Reg–with registration; NoReg–without registration.
