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Hounsfield unit to relative electron density calibration curve for the 4DCT images in this study
| CT intensity (HU) | Electron density relative to water |
|---|---|
| −1000 | 0.00 |
| −705 | 0.30 |
| −569 | 0.41 |
| −95 | 0.92 |
| −42 | 0.98 |
| 0 | 1.00 |
| 40 | 1.05 |
| 86 | 1.11 |
| 225 | 1.14 |
| 227 | 1.16 |
| 473 | 1.34 |
| 845 | 1.56 |
| 1283 | 1.82 |
| 5812 | 5.76 |
| 9035 | 8.00 |
| 9754 | 8.50 |
