Figure 3.

Task-based evaluation of CMOS detector performance in extremity CBCT. (A) Relative detectability for a range of feature sizes (vertical axis) as a function of pixel size. Scintillator thickness is assumed constant and equal to 0.7 mm. Detectability is normalized to the maximum value for each a_obj. Dashed lines indicate maximum d′ for each feature size. (B) Ratio of d′² achieved with the same scintillator as (A), but at increased electronic noise consistent with an a-Si:H FPD, to maximum d′² attained for each a_obj by the low-noise CMOS detector of (A). (C) Relative detectability of the CMOS detector as a function of scintillator thickness and imaging task, normalized by maximum detectability achieved for each a_obj across the range of t_CsI. Pixel size is 0.099 mm. (D) Joint optimization of pixel size and scintillator thickness for a “trabecular” imaging task with feature size of 0.06 mm. The graph shows detectability of a CMOS detector (normalized by the maximum).