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. Author manuscript; available in PMC: 2013 Jul 1.
Published in final edited form as: IEEE Trans Med Imaging. 2012 Mar 6;31(7):1461–1471. doi: 10.1109/TMI.2012.2190088

Fig. 1.

Fig. 1

Comparison of TOF data at a 45° transverse (azimuthal) angle binned into histo-projections (left) and partitioned into histo-images with the DIRECT approach (right). Histo-projections can be thought of as an extension of individual non-TOF projections (radial bins) along the TOF direction (time bins); the sampling intervals relate to the projection geometry and TOF resolution. Histo-images are defined by the geometry and desired sampling (voxel size) of the reconstructed images. For simplicity we illustrate only the 2D case; extension to the 3D case is straightforward: histo-images become 3D voxelized images, and views are defined by both transverse (azimuthal) and co-polar (tilt) angles. The schematics shown represent the deposition of many events from one source location.