FIG. 16.

Normalized 3D ideal observer SNR (d′) as a function of a-Se thickness for 300 μm (a) and 150 μm (b) Gaussian objects modeled with (i.e., partially isocentric geometry—squares) and without (i.e., complete isocentric geometry—circles) the effect of x-ray obliquity. Total glandular dose was set equal to 1.5 mGy in each case. In each case, f_h was optimized to yield the greatest value of $d_{\mathrm{IP}}^{\prime }$.