| Figure 1 Reconstruction procedure with retrospective
ECG-gating (four slices). (a) Retrospective ECG-gating is able to overcome
the limitation of prospective ECG-triggering with inconsistent heart phase
scanning when arrhythmia is present. Arbitrary phases of the heart motion
were reconstructed from the continuous raw helical data; (b) Slow table
motion during helical scanning and simultaneous acquisition of four slices
and the ECG trace are employed to perform an oversampling of scan projections;
(c) Higher helical pitch sets the appropriate sampling gap of the raw data
space due to misalignments between helical pitch and heartbeat. |
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