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. 2015 Oct 8;42(11):6317–6336. doi: 10.1118/1.4931407

FIG. 3.

FIG. 3.

Prospective vs retrospective projection gating. (A) Results of in vivo dual energy microCT reconstruction in the mouse. Three hundred projections were acquired at each of two energies (80 kVp, shown; 40 kVp) using prospective cardiorespiratory gating [end diastole, 300 projections/energy/phase] (Ref. 26). Reconstruction of each data set was performed using FBP followed by joint BF prior to material decomposition (red, iodine; green, gold). (B) Comparable reconstruction results using retrospective projection gating followed by time-weighted FBP (Sec. 2.C) and by 5D reconstruction with rank-sparse kernel regression [22.5 projections/energy/phase; Fig. 2]. Approximate relative projection sampling densities are as shown by energy for one cardiac phase and for dual source acquisition. Iodine and gold concentrations are shown in mg/ml. CT data are scaled in Hounsfield units. Scale bar: 1 cm.