TABLE 5.
Dose differences between deformed computed tomography (dCT) and synthetic CT (sCT) for organs‐at‐risk at dose–volume histogram (DVH) points
| Structure | DVH point | Physical dose difference (%) | BED difference (%) | ||
|---|---|---|---|---|---|
| Mean (1SD) | [min, max] | Mean (1SD) | [min, max] | ||
| Spinal cord (N = 11) | D 0.03cc | 1.2 (1.7) | [–0.7, 4.8] | 1.5 (2.4) | [–1.3, 6.1] |
| Kidney L (N = 10) | D 10% | 0.3 (0.7) | [–0.7, 1.8] | 0.4 (0.9) | [–0.9, 2.4] |
| D 25% | 0.2 (1.4) | [–3.1, 2.0] | 0.3 (1.6) | [–3.2, 2.7] | |
| D mean | 0.2 (0.9) | [–1.3, 1.9] | 0.3 (1.1) | [–1.2, 2.5] | |
| Kidney R (N = 9) | D 10% | 0.5 (1.3) | [–0.8, 3.5] | 0.6 (1.5) | [–1.1, 3.8] |
| D 25% | 0.0 (1.5) | [–2.4, 2.7] | 0.0 (1.8) | [–2.6, 3.1] | |
| D mean | 0.1 (1.4) | [–1.8, 3.0] | 0.2 (1.7) | [–1.6, 3.8] | |
| Pancreas (N = 3) | D mean | 0.9 (1.1) | [0.2, 2.2] | 1.5 (2.1) | [0.1, 3.9] |
| Liver (N = 9) | D mean | 0.3 (0.4) | [–0.3, 0.9] | 0.7 (0.9) | [–0.4, 2.4] |
| Heart (N = 2) | D 0.03cc | 0.3 (2.0) | [–1.1, 1.7] | 0.7 (2.9) | [–1.4, 2.8] |
| D 15cc | –0.3 (0.9) | [–0.9, 0.4] | –0.2 (0.8) | [–0.7, 0.4] | |
| Great vessels (N = 15) | D 0.5cc | 0.5 (1.1) | [–0.6, 3.0] | 0.9 (1.6) | [–0.7, 4.7] |
| Esophagus (N = 9) | D 0.5cc | –0.5 (1.7) | [–3.9, 2.6] | –0.4 (1.9) | [–4.0, 3.4] |
| Stomach (N = 10) | D 0.5cc | 0.1 (2.2) | [–4.4, 3.3] | 0.3 (3.1) | [–4.5, 5.6] |
| D 10cc | –0.2 (1.1) | [–1.4, 2.5] | –0.2 (1.4) | [–1.5, 3.6] | |
| Duodenum (N = 11) | D 0.5cc | 1.0 (1.7) | [–0.8, 4.9] | 1.3 (2.5) | [–1.4, 7.0] |
| D 5cc | 0.8 (1.9) | [–1.2, 5.7] | 1.1 (2.6) | [–2.0, 7.8] | |
| Small bowel (N = 8) | D 0.5cc | 0.6 (0.9) | [–0.4, 2.3] | 0.9 (1.3) | [–0.4, 3.4] |
| D 5cc | 0.7 (0.7) | [–0.7, 1.5] | 1.1 (1.0) | [–0.7, 2.3] | |
| Large bowel (N = 11) | D 0.5cc | 0.6 (0.9) | [–0.5, 2.2] | 1.0 (1.2) | [–0.8, 2.7] |
| D 20cc | 0.4 (1.0) | [–0.6, 2.4] | 0.4 (1.3) | [–1.3, 3.0] | |
| Rectum (N = 3) | D 1% | 0.2 (0.2) | [0.0, 0.5] | 0.3 (0.3) | [0.0, 0.6] |
| D 10% | 0.0 (0.3) | [–0.3, 0.2] | 0.0 (0.4) | [–0.4, 0.3] | |
| D 35% | –0.3 (0.3) | [–0.6, 0.0] | –0.3 (0.3) | [–0.6, 0.0] | |
| Bladder (N = 3) | D 1% | 0.1 (0.2) | [–0.2, 0.3] | 0.2 (0.1) | [0.1, 0.3] |
| D 20% | –0.2 (0.8) | [–1.1, 0.3] | –0.1 (0.8) | [–1.1, 0.4] | |
| D 50% | –0.5 (1.6) | [–2.4, 0.7] | –0.6 (1.7) | [–2.5, 0.7] | |
| Penile bulb (N = 2) | D mean | 0.0 (0.4) | [–0.3, 0.2] | 0.1 (0.4) | [–0.2, 0.4] |
| Femur head L (N = 3) | D 5% | –0.5 (1.4) | [–2.1, 0.4] | –0.5 (1.6) | [–2.4, 0.5] |
| Femur head R (N = 3) | D 5% | –0.2 (0.6) | [–0.8, 0.3] | –0.3 (0.9) | [–1.3, 0.3] |
Note: The mean with one standard deviation (1SD) and range for both physical dose and biologically effective dose (BED) difference are presented. The unit for all the values is percent relative to the dCT‐based dose.