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RED and EAN for DL-DECT images with wide collimation and narrow collimation for Arr2
| Material | RED | EAN | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Theoretical value | Wide collimation | Narrow collimation | Theoretical value | Wide collimation | Narrow collimation | ||||||||
| Mean | R.D (%) | Mean | R.D (%) | Mean | R.D (%) | Mean | R.D (%) | ||||||
| Lung inhale 1 | 0.200 | 0.201 | 0.5 | 0.197 | −1.5 | 6.685 | 5.049 | −24.5 | 6.688 | 0.0 | |||
| Lung inhale 2 | 0.200 | 0.2 | 0.209 | 4.5 | 5.590 | −16.4 | 6.239 | −6.7 | |||||
| Lung exhale 1 | 0.496 | 0.531 | 7.1 | 0.539 | 8.7 | 7.231 | 7.428 | 2.7 | 7.248 | 0.2 | |||
| Lung exhale 2 | 0.530 | 6.9 | 0.536 | 8.1 | 7.635 | 5.6 | 7.347 | 1.6 | |||||
| Adipose 1 | 0.949 | 0.960 | 1.2 | 0.956 | 0.7 | 6.301 | 6.220 | −1.3 | 6.263 | −0.6 | |||
| Adipose 2 | 0.955 | 0.6 | 0.954 | 0.5 | 6.374 | 1.2 | 6.376 | 1.2 | |||||
| Breast 1 | 0.976 | 0.984 | 0.8 | 0.984 | 0.8 | 6.651 | 6.735 | 1.3 | 6.721 | 1.1 | |||
| Breast 2 | 0.983 | 0.7 | 0.982 | 0.6 | 7.093 | 6.7 | 6.763 | 1.7 | |||||
| Muscle 1 | 1.040 | 1.043 | 0.3 | 1.043 | 0.3 | 7.249 | 7.441 | 2.7 | 7.391 | 2.0 | |||
| Muscle 2 | 1.044 | 0.4 | 1.043 | 0.3 | 7.594 | 4.7 | 7.329 | 1.1 | |||||
| Liver 1 | 1.052 | 1.053 | 0.1 | 1.050 | −0.2 | 7.258 | 7.343 | 1.2 | 7.397 | 1.9 | |||
| Liver 2 | 1.044 | −0.8 | 1.049 | 0.3 | 8.174 | 12.6 | 7.369 | 1.5 | |||||
| Trabecular bone 1 | 1.117 | 1.093 | −2.2 | 1.094 | −2.1 | 9.833 | 10.044 | 2.1 | 9.774 | −0.6 | |||
| Trabecular bone 2 | 1.078 | −3.5 | 1.095 | −2.0 | 10.440 | 6.2 | 9.754 | −0.8 | |||||
RED, relative electron density; EAN, effective atomic number; DL-DECT, dual-layer dual-energy computed tomography; Arr, arrangement.
R.D indicates the relative difference between theoretical values and the measured values.