Table 2.
Characteristics of insert materials in sections 2 and 4 of the image quality phantom.
| Phantom section | Material | Physical density (g/cc) | Electron density relative to background | No. of inserts visible | Size of smallest visible insert (mm) |
|---|---|---|---|---|---|
| 2 | SIG – background | 1.02 | 1 | – | – |
| 2 | 1% SIG | 1.03 | 1.01 | 1 | 20 |
| 2 | 3% SIG | 1.05 | 1.03 | 1 | 20 |
| 2 | Brain | 1.05 | 1.05 | 3 | 7 |
| 2 | Liver | 1.09 | 1.07 | 4 | 5 |
| 4 | SIG – background | 1.02 | 1 | - | - |
| 4 | Inner bone | 1.14 | 1.09 | 4 | 5 |
| 4 | Acrylic | 1.18 | 1.17 | 4 | 5 |
| 4 | Bone – 50% CaCO3 | 1.56 | 1.48 | 5 | 3 |
| 4 | Air | 0.0012 | 0.001 | 5 | 3 |