Table 3.
Individual and average differences in CTV coverage between contrast and non-contrast plans for proton therapy as well as mean doses of liver and kidney for SECT and DLCT methods
| Patient # | Technique | Renal iodine uptake (mg ml−1) | Range pullback (cm) | SECT method ΔD99% | DLCT method ΔD99% | Liver/Kidney mean dose (Gy) | |
|---|---|---|---|---|---|---|---|
| SECT | DLCT | ||||||
| 1 | MFO | 2.39 | 0.3 | 1.1 | 0.1 | 1.2/3.7 | 1.0/3.5 |
| 2 | SFUD | 2.46 | 0.3 | 2.5 | 0.1 | 3.3/9.4 | 2.8/9.2 1 |
| 3 | MFO | 3.10 | 0.2 | 1.2 | 0.4 | 1.0/5.9 | 1.0/5.5 2.9 |
| 4 | MFO | 3.31 | 0.2 | 2.8 | 0.2 | 3.4/2.6 | 2.9/2.8 |
| 5 | MFO | 3.37 | 0.3 | 1.8 | 0.8 | 1.0/11.2 | 1.2/10.3 |
| 6 | SFUD | 3.39 | 0.5 | 2.3 | 0.2 | 1.4/1.9 | 1.4/1.9 |
| 7 | SFUD | 4.56 | 0.4 | 4.1 | 0.7 | 4.5/10.7 | 4.8/10.4 |
| 8 | MFO | 4.74 | 0.3 | 6.5 | 0.2 | 1.3/9.3 | 1.2/9.3 |
| 9 | SFUD | 4.83 | 0.4 | 7.3 | 0.1 | 2.8/7.2 | 2.6/7.1 |
| 10 | SFUD | 5.33 | 0.3 | 7.1 | 0.2 | 0.5/3.7 | 0.5/3.6 |
| Mean ± SD | - | 3.75 ± 1.02 | 0.3 ± 0.1 | 3.67 ± 2.43 | 0.30 ± 0.25 | ||
CTV, clinical target volume; DLCT, dual layer CT; ED, electron density; HU, Hounsfield unit; MFO, multifield optimization;SD, standard deviation; SECT, single-energy CT; SFUD, single-field uniform-dose optimization.