Figure 5.

Simulated tracker configurations as viewed from above the microPET scanner: (a) two opposed trackers with no elevation; (b) two opposed trackers elevated by 45°; (c) four trackers arranged symmetrically around the scanner, each elevated by 45°; the azimuthal angle between each pair on a given side of the scanner is 90°; (d) similar to (c) except the azimuthal angle between each pair on a given side of the scanner is 60°; (e) a single tracker viewing from above with its baseline aligned with the axial direction of the scanner. Elevation angles are with respect to the horizontal plane through the centre of the scanner. All trackers were 0.5 m from the centre of the scanner FOV with optical axes directed at this point.