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. Author manuscript; available in PMC: 2012 May 7.
Published in final edited form as: Phys Med Biol. 2011 Apr 5;56(9):2667–2685. doi: 10.1088/0031-9155/56/9/002

Figure 2.

Figure 2

(a) Simulation arrangement of a PET scanner with the incident proton beam from the right. The scanner axial direction is perpendicular to the proton beam and into page as shown here. The sphere shows a 30-cm water phantom and the colored bar indicates the distribution of positron emitters produced within it by the proton beam. The profile of the positron emitters along the beam direction was parameterized as shown in figure 1b. (b) Simulated PET system geometries with partial ring configurations. The angular coverage of the ring studied includes a full ring (left), a two-third ring that corresponds to ±120° angular coverage (middle), and a half ring that corresponds to ±90° angular coverage (right).