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Dynamic 4D cardiac microSPECT (a) and microCT (b) images showing a single long-axis slice of the murine left ventricle in a sagittal orientation over 10 phases of the cardiac cycle (10 time bins). Each phase represents a distinct 3D isotropic dataset, which are each compiled via retrospective cardiac gating and then used in the 4D volumetric segmentation process in Vitrea.
