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. Author manuscript; available in PMC: 2010 Apr 22.
Published in final edited form as: IEEE Trans Nucl Sci. 2009 Oct 1;56(5):2739–2749. doi: 10.1109/tns.2009.2021765

Fig. 4.

Fig. 4

NCAT Respiratory motion correction of noiseless datasets. (a) Mid-ventricular short-axis slice from simulation which did include respiratory motion with no motion correction included in 18 iterations of MLEM. (b) Short-axis slice from projections simulated with the phantom solely in the reference (middle) motion-state after 18 iterations of MLEM reconstruction. Notice the thinner ventricular wall, larger blood pool region, and better separation from the liver compared to the with motion slice. (c) Short-axis slice from simulation which did include motion reconstructed with 18 iterations of MC-MLEM motion correction. Notice the similarity to the case reconstructed in the absence of motion. (d) Short-axis slice from simulation which did include motion reconstructed by 2 iterations of MGEM-1. Note the similarity to 18 iterations of MC-MLEM as expected with use of 9 subsets. (e) Short-axis slice from simulation which did include motion reconstructed by 18 iterations of MGEM-1. Note the further significant recovery of resolution due to the inclusion of modeling spatial-resolution in reconstruction. (f) Short-axis slice from simulation which did include motion reconstructed by 18 iterations of MGEM-2. Notice the considerable smoothing compared to 2 iterations of MGEM-1.