Biomedical Engineering Reference
In-Depth Information
(a) Standard EM, Transversal View
(b) 4D EM, Transversal View
(c) Standard EM, Coronal View
(d) 4D EM, Coronal View
(e) Standard EM, Sagittal View
(f) 4D EM, Sagittal View
FIGURE 9.2: (See color insert.) Two exemplary H
2
15
O reconstructions,
acquired with the standalone Siemens PET Scanner ECAT EXACT (model
921). It should be noticed that with this type of scanner image acquisition can
be done only slice-by-slice. The images on the left-hand side show standard
EM reconstructions of a slice of the seventh frame in transversal, coronal and
sagittal view. The reconstructions have been smoothed by additional Gauss
filtering between each EM iteration. The images on the right-hand side show
the same views of the same slice but computed via the described 4D-EM
reconstruction method. Again, after each EM iteration Gauss filtering has
been applied to ensure spatial smoothness. The images on the right-hand side
have a much higher signal-to-noise ratio than those derived from the frame-
independent standard EM reconstructions.
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