Figure 2.

(a) End-inspiration coronal slice reconstructed from the NCAT simulation with two angles retained per SPECT camera head. (b) Midinspiration coronal slice reconstructed using all 60 simulated projection angles. Note that the heart is segmented in (b) as it would be for the reference slices to focus motion estimation on the heart region during registration. (c) Midinspiration coronal slice reconstructed with two angles retained per head as per (a). Note that (c) is structurally closer to (a) than (b) is, thus enabling better registration.