Fig. 1.

(a) Illustration of a gamma camera (rectangle), pendant breast (hemiellipsoid), and detector acquisition trajectory (ring) about the breast. (b) Associated polar plots of the three breast SPECT acquisition trajectories utilized in our lab. Polar plots give the detector tilt (radius from center) as a function of azimuthal 360-deg position around the breast. Both the vertical axis of rotation (VAOR) and tilted parallel beam (TPB) trajectories have fixed detector tilts, whereas the 60-deg offset PROJSINE trajectory utilizes a sinusoidal varying tilt. Note that the example TPB plot is for a fixed tilt of 30 deg, but the detector tilt may be set to any arbitrary fixed or dynamically varying polar angle.