Table 4.
Differences in Bragg peak positions for SECT and DECT compared to reference positions in ground truth tissue decompositions. The “HCO” material denotes an artificial material with 10% different carbon and oxygen mass fractions compared to the reference composition (H = 10%, C = 20%, O = 70%).
| 350 MeV/u 12C | 117 MeV p | 183 MeV p | 222 MeV p | ||
|---|---|---|---|---|---|
| Material | Modality | diff [%] | diff [%] | diff [%] | diff [%] |
| Adiposetissue3 | DECT | 0.7 | 0.7 | 0.7 | 0.7 |
| Adiposetissue3 | SECT | 0.0 | 0.0 | 0.0 | 0.0 |
| BrainCerebrospinalfluid | DECT | 0.0 | 0.0 | −0.1 | 0.0 |
| BrainCerebrospinalfluid | SECT | −2.1 | −2.2 | −2.2 | −2.2 |
| Braingraymatter | DECT | −0.1 | −0.1 | −0.1 | 0.0 |
| Braingraymatter | SECT | −0.6 | −0.6 | −0.6 | −0.6 |
| Cartilage | DECT | −0.2 | −0.2 | −0.2 | −0.2 |
| Cartilage | SECT | 1.8 | 1.7 | 1.8 | 1.7 |
| D6L3inclcartilagem | DECT | 0.0 | 0.0 | −0.1 | −0.1 |
| D6L3inclcartilagem | SECT | −0.1 | −0.1 | −0.1 | −0.1 |
| Femurtotalbone | DECT | 0.0 | 0.0 | 0.0 | 0.0 |
| Femurtotalbone | SECT | −0.8 | −0.8 | −0.7 | −0.8 |
| HCO | C10%O80% | 0.1 | 0.3 | 0.3 | 0.3 |
| HCO | C30%O60% | −0.1 | −0.3 | −0.2 | −0.2 |
| Humerustotalbone | DECT | 0.0 | 0.0 | 0.0 | 0.0 |
| Humerustotalbone | SECT | −0.5 | −0.5 | −0.5 | −0.5 |
| Liver3 | DECT | −0.2 | −0.1 | −0.1 | −0.2 |
| Liver3 | SECT | −0.9 | −0.8 | −0.9 | −0.9 |
| Muscleskeletal2 | DECT | −0.1 | −0.2 | −0.2 | −0.1 |
| Muscleskeletal2 | SECT | −0.4 | −0.4 | −0.4 | −0.3 |
| Urine | DECT | 0.0 | 0.0 | −0.1 | −0.1 |
| Urine | SECT | −0.7 | −0.8 | −0.8 | −0.8 |
| Yellowmarrow | DECT | 0.6 | 0.6 | 0.6 | 0.5 |
| Yellowmarrow | SECT | 1.7 | 1.8 | 1.7 | 1.7 |