Table 1 Electron densities computed from the Lehmann’s cross-sectional model and Saito’s fitted function
From: Dual-layer spectral computed tomography: measuring relative electron density
Lehmann | Saito | ||||||
|---|---|---|---|---|---|---|---|
Nominal value | Approximate value | Error (%) | Fitted value | Error (%) | |||
Gammex | 1 | SB3 cortical bone | 1.696 | 1.675 | −1.24% | 1.702 | + 0.35% |
2 | CB2 50% CaCO3 | 1.471 | 1.463 | −0.54% | 1.472 | + 0.07% | |
3 | CB2 30% CaCO3 | 1.280 | 1.282 | + 0.16% | 1.276 | −0.31% | |
4 | B200 bone mineral | 1.109 | 1.116 | + 0.63% | 1.107 | −0.18% | |
5 | IB inner bone | 1.107 | 1.114 | + 0.63% | 1.106 | −0.09% | |
6 | LV1 liver | 1.062 | 1.081 | +1.79% | 1.061 | −0.09% | |
7 | BRN-SR2 brain | 1.047 | 1.064 | +1.62% | 1.041 | −0.57% | |
8 | CT water | 0.990 | 1.026 | +3.64% | 1.009 | +1.92% | |
9 | BR-12 breast | 0.961 | 0.977 | +1.66% | 0.959 | −0.21% | |
10 | AP6 adipose | 0.928 | 0.941 | +1.40% | 0.923 | −0.54% | |
11 | LN-450 lung | 0.466 | 0.470 | + 0.86% | 0.471 | +1.07% | |
12 | LN-300 lung | 0.264 | 0.246 | −6.82% | 0.255 | −3.41% | |
Catphan | 13 | Teflon | 1.868 | 1.895 | +1.45% | 1.850 | −0.96% |
14 | Delrin | 1.363 | 1.373 | + 0.73% | 1.341 | −1.61% | |
15 | Acrylic | 1.147 | 1.161 | +1.22% | 1.135 | −1.05% | |
16 | Polystyrene | 0.998 | 1.014 | +1.60% | 0.992 | −0.60% | |
17 | LDPE | 0.945 | 0.959 | +1.48% | 0.939 | −0.63% | |
18 | PMP | 0.853 | 0.866 | +1.52% | 0.850 | −0.35% | |
Average | 1.086 | 1.096 | 1.53%* | 1.083 | 0.87%* | ||