Table 3.
Effective atomic number obtained experimentally (Zeff (DECT)) as well as by using formulae (Zeff (actual)) given in equation 1
| Sample code | HU 100 | HU 140 Sn | Zeff (DECT) | Zeff (Actual) | Percentage error (R1) | ρe (DECT) ×1023/cm3 | ρe (actual) ×1023/cm3 | Percentage error (R2) |
|---|---|---|---|---|---|---|---|---|
| S11 | 600 | 540 | 7.51 | 7.91 | 5.0 | 4.90 | 5.02 | 2.3 |
| S12 | 2154.02 | 1401.84 | 14.69 | 15.08 | 2.7 | 6.39 | 6.31 | 1.2 |
| S13 | 3098.5 | 1789.94 | 16.13 | 16.34 | 1.2 | 6.83 | 7.01 | 2.5 |
| S14 | 836.62 | 469.58 | 13.89 | 14.23 | 2.3 | 4.06 | 4.12 | 1.4 |
| S15 | 998.1 | 763.9 | 11.71 | 11.47 | 2.0 | 5.25 | 5.35 | 1.8 |
Also electron density obtained experimentally (ρe (obtained)) as well as by using formulae (ρe (actual)) given in equation 5. Percentage error R1 and R2 are the ratio of actual to DECT obtained values of effective atomic number and electron density respectively. HU: Hounsfield unit, DECT: Dual-energy computed tomography