TABLE 1.
SPR comparison based on SECT and commercial SPR data sets of the Sun Nuclear Electron Density Phantom. The values are compared to the average measured values for each tissue surrogate plug
| Material | Vendor specified physical density (g cm3) | MLIC Measured rSPR | SECT‐based Assigned rSPR | rSPR from DirectSPR scan | SECT difference from measurement (%) | DirectSPR difference from measurement (%) |
|---|---|---|---|---|---|---|
| Breast | 0.98 | 0.9827 | 0.9999 | 0.9887 | 1.7 | 0.6 |
| Cortical bone | 1.93 | 1.7012 | 1.8321 | 1.7271 | 7.7 | 1.5 |
| Adipose | 0.96 | 0.9636 | 0.9939 | 0.9767 | 3.1 | 1.4 |
| Solid water | 1.02 | 1.0015 | 1.0105 | 1.0008 | 0.9 | −0.1 |
| Inner bone | 1.21 | 1.1406 | 1.1708 | 1.1491 | 2.6 | 0.7 |
| Lung 450 | 0.45 | 0.5064 | 0.4836 | 0.5026 | −4.5 | −0.7 |
| Brain | 1.05 | 1.0158 | 1.0349 | 1.0230 | 1.9 | 0.7 |
| Lung 300 | 0.29 | 0.3479 | 0.3029 | 0.3424 | −12.9 | −1.6 |
| Liver | 1.08 | 1.0645 | 1.0660 | 1.0510 | 0.1 | −1.3 |
| CaCO3 30% | 1.33 | 1.2570 | 1.2686 | 1.2633 | 0.9 | 0.5 |
| CaCO3 50% | 1.56 | 1.4285 | 1.4476 | 1.4261 | 1.3 | −0.2 |