| Figure 2 Reconstruction procedure for 4D cardiac imaging
using ECG-gating technique. ECG-gating permits visualisation of multiple
time points during the cardiac cycle out of one helical CT data set. For
the first end-diastolic phase, the image acquisition window was centred
on the peak of the R wave. For the second data set, the centre was positioned
at 10 % of the R–R interval, and for subsequent data sets, the centre
of the image acquisition window was moved toward the end of the cardiac
cycle in increments of 10%. The groups of slices Z1-10 and Z2-10 or Z1-20
and Z2-20 in the figure were reconstructed from the same phase of R–R
interval. Each volume set was converted to a 3D image, and these sequential
3D images were displayed as 4D cardiac images. |
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