Table 2.
Summary of stages in the cascaded system model for CBCT.
| Stage | Type of process | Description | Parameter |
|---|---|---|---|
| 0 | Incident fluence | ||
| 1 | Gain (binary selection) | Interaction of x-ray quanta in detector | |
| 2 | Gain (stochastic) | Production of secondary quanta (including parallel cascade) | |
| 3 | Spreading (stochastic) | Spread of secondary quanta | T3(fu,fv) |
| 4 | Gain (binary selection) | Coupling to aperature (photodiode) | |
| 5 | Spreading (deterministic) | Integration by pixel aperature | T5(fu,fv) |
| 6 | Sampling (aliasing) | Detector sampling | III6(fu,fv) |
| 7 | Gain (deterministic)+ Additive noise | Additive electronics noise | Sadd7(fu,fv) |
| 8 | Gain (deterministic) | Log normalization | |
| 9 | Spreading (deterministic) | Ramp filter | T9(fu,fv) |
| 10 | Spreading (deterministic) | Apodization filter | T10(fu,fv) |
| 11 | Spreading (deterministic) | Interpolation | T11(fu,fv) |
| 12 | Spreading (deterministic) | Backprojection | Θ12(fx,fy,fz) |
| 13 | Sampling (aliasing) | 3D Sampling | III3(fx,fy,fz) |