
154 Statistical Computing in Nuclear Imaging
(A) (B)
(C) (D)
FIGURE 5.15 The voxelized imaging volume (A). An example of ROR (darkened
voxels) (B) that corresponds to line. (C) and (D ) show RORs that correspond to a
plane and a volume.
growth of the large volumes of the crystal as well as a relatively low cost of
manufacturing.
Figure 5.16 presents the heart of any gamma camera system. Although not
shown in the figure, the NaI(Tl) crystal is encased because it is hygroscopic.
When gamma ray hits the c rystal it g enerates visible light that propagates
to photocathodes of all the PMTs. In general, each PMT produces different
strength signals but the PMTs ...