Table 3.
Mean, maximum, and standard deviations of SPR, mass density, and I-value differences to the reference values for SECT and DECT [71 Schneider et al. tissues (Ref. 2), Table 1]. DECT conversion comprehends two different ways of deriving the SPR: using the ϱe directly and elemental mass fractions only for the I-value (“DECT with ϱe”) or deriving mass density from ϱe and using elemental mass fractions for the I-value and mean Z/A to derive the ϱe for the SPR prediction 6.
| (mean±sd), max differences | |||
|---|---|---|---|
| to ground truth [%] | CT modality | Zeff < 8.2 | Zeff ⩾ 8.2 |
| SPR | SECT | (0.53 ± 0.58), max: 3.08 | (0.27 ± 0.22), max: 0.77 |
| DECT | (0.21 ± 0.13), max: 0.67 | (0.06 ± 0.04), max: 0.14 | |
| |
DECT with ϱe |
(0.06 ± 0.04), max: 0.18 |
(0.05 ± 0.03), max: 0.11 |
| ϱ | SECT | (0.50 ± 0.57), max: 3.04 | (0.30 ± 0.15), max: 0.66 |
| |
DECT |
(0.20 ± 0.17), max: 0.88 |
(0.05 ± 0.04), max: 0.14 |
| I | SECT | (1.08 ± 1.42), max: 5.82 | (1.26 ± 0.99), max: 3.90 |
| DECT | (0.44 ± 0.29), max: 1.34 | (0.33 ± 0.23), max: 0.96 |