Fig. 3.

Illustration of simulation geometry including radiopaque patient bed. (a) Lateral view of simulated prone patient geometry indicating the polar tilting angle ($\phi$) of the detector. (b) Posterior–anterior view of geometry indicating the azimuthal rotation angle ($\theta$) and illustration of the hexagonal parallel-hole collimator. (c) Superior–inferior view showing the intersection of the elliptical-cylinder torso and breast.