Np. Willis et Y. Bresler, OPTIMAL SCAN FOR TIME-VARYING TOMOGRAPHY .2. EFFICIENT DESIGN AND EXPERIMENTAL VALIDATION, IEEE transactions on image processing, 4(5), 1995, pp. 654-666
In a previous paper, we presented a theoretical analysis of tomographi
c reconstruction of objects with spatially localized temporal variatio
n, such as a thorax cross section with a beating heart, That analysis
showed that by using an optimally scrambled angular sampling order, th
e scan rate required to avoid motion artifacts in the reconstructed im
ages can be lowered as much as four times while preserving image quali
ty, In this paper, we present a simple design procedure for the optimu
m choice of angular sampling pattern, which depends only on pre-specif
ied geometric and spectral parameters and the desired spatial resoluti
on, The resulting patterns have a simple congruential structure, Recon
struction is accomplished by interpolation to standard time-invariant
scan format, followed by conventional reconstruction, The interpolatio
n only requires linear shift-invariant separable filtering, at a negli
gible computational cost, Simulation results demonstrate the technique
and validate the analysis for both bandlimited and approximately band
limited objects.