Table 3. Comparisons of the dose-volume histograms (DVHs) of coplanar and non-coplanar EF-IMRT.
| Coplanar | Non-coplanar | Mean difference1 | P value | |||
|---|---|---|---|---|---|---|
| Mean | Range | Mean | Range | |||
| PTV | ||||||
| V95 (%)2 | 99.2 | 98.9–99.3 | 99.1 | 98.8–99.3 | 0.1 | 0.24 |
| D95 (%)3 | 98.7 | 98.2–99.2 | 98.7 | 98.0–99.0 | 0 | 0.97 |
| D50 (%)3 | 104 | 103.6–104.6 | 104 | 103.2–105.0 | 0 | 0.85 |
| D0.1cc (%)4 | 109 | 108.7–109.1 | 109 | 108.8–109.0 | 0 | 0.3 |
| Right kidney | ||||||
| RKV10 (%)5 | 56.4 | 50.8–61.8 | 39.8 | 30.8–54.1 | 16.6 | < 0.001 |
| RKV15 (%)5 | 29.2 | 20.1–37.2 | 18.5 | 11.0–31.2 | 10.7 | 0.003 |
| RKV20 (%)5 | 14.4 | 7.6–23.7 | 9.2 | 2.7–20.3 | 5.2 | 0.038 |
| RKV25 (%)5 | 5.4 | 0.5–14.9 | 3.7 | 0.0–13.9 | 1.7 | 0.19 |
| Left kidney | ||||||
| LKV10 (%)6 | 55.8 | 45.5–63.1 | 37.8 | 26.5–49.9 | 18 | < 0.001 |
| LKV15 (%)6 | 30.7 | 21.3–37.4 | 19.8 | 11.0–26.2 | 10.9 | < 0.001 |
| LKV20 (%)6 | 15.7 | 8.3–21.2 | 9.8 | 4.0–15.4 | 5.9 | 0.007 |
| LKV25 (%)6 | 5.2 | 1.7–10.0 | 3.5 | 0.5–8.1 | 1.7 | 0.12 |
| Small bowel | ||||||
| SV20 (%)7 | 76.8 | 64.6–92.9 | 73.9 | 63.2–91.3 | 2.9 | 0.38 |
| SV30 (%)7 | 47.6 | 30.0–63.9 | 49.3 | 31.6–69.1 | -1.7 | 0.62 |
| SV40 (%)7 | 28.8 | 14.5–42.3 | 29.3 | 15.1–43.3 | -0.5 | 0.73 |
| SV50 (%)7 | 17.3 | 7.3–27.4 | 17.3 | 6.8–27.6 | 0 | 1 |
| Rectum | ||||||
| RV30 (%)8 | 98.6 | 93.6–100 | 99 | 94.7–100 | -0.4 | 0.45 |
| RV40 (%)8 | 97.1 | 91.7–100 | 97.3 | 92.5–100 | -0.2 | 0.85 |
| RV50 (%)8 | 91.5 | 87.4–97.9 | 91.3 | 86.6–97.4 | 0.2 | 0.73 |
| Bladder | ||||||
| BV30 (%)9 | 100 | 99.9–100 | 100 | 99.9–100 | 0 | 1 |
| BV40 (%)9 | 94.4 | 78.4–100 | 97.2 | 91.2–100 | -2.8 | 0.57 |
| BV50 (%)9 | 69.7 | 34.9–98.5 | 68.7 | 31.2–97.3 | 1 | 0.85 |
| Right femoral head | ||||||
| RFV30 (%)10 | 36.3 | 0–95.7 | 35.5 | 27.6–38.9 | 0.8 | 0.21 |
| RFV40 (%)10 | 3.7 | 0–1.4 | 5.1 | 0.1–9.9 | -1.4 | 0.38 |
| RFV50 (%)10 | 0 | 0–0 | 0 | 0–0 | 0 | - |
| Left femoral head | ||||||
| LFV30 (%)11 | 36.9 | 26.3–78.3 | 35 | 29.0–47.2 | 1.9 | 0.43 |
| LFV40 (%)11 | 6.6 | 0–33.9 | 4.5 | 0–17.4 | 2.1 | 0.88 |
| LFV50 (%)11 | 0.7 | 0–6.6 | 0 | 0–0 | 0.7 | 0.37 |
| Cord | ||||||
| CD0.1cc (Gy) 12 | 40.4 | 37.5–43.8 | 42.3 | 39.5–44.3 | -1.9 | 0.07 |
1Comparisons between coplanar and non-coplanar plans
2V95 –the percentage of the PTV covered by 95% of the prescription dose
3D95 and D50 –the minimum doses received by 95% and 50% of the PTV, expressed as percentages of the prescription dose, respectively
4D0.1cc–the minimum dose received by 0.1 cc of the PTV expressed as a percentage of the prescription dose
5RKV10, RKV15, RKV20, and RKV25 –the percentage volumes of the right kidney receiving 10, 15, 20, and 25 Gy, respectively
6LKV10, LKV15, LKV20, and LKV25 –the percentage volumes of the left kidney receiving 10, 15, 20, and 25 Gy, respectively
7SV20, SV30, SV40, and SV50 –the percentage volumes of the small bowel receiving 20, 30, 40, and 50 Gy, respectively
8RV30, RV40, and RV50 –the percentage volumes of the rectum receiving 30, 40, and 50 Gy, respectively
9BV30, BV40, and BV50 –the percentage volumes of the bladder receiving 30, 40, and 50 Gy, respectively
10RFV30, RFV40, and RFV50 –the percentage volumes of the right femoral head receiving 30, 40, and 50 Gy, respectively
11LFV30, LFV40, and LFV50 –the percentage volumes of the left femoral head receiving 30, 40, and 50 Gy, respectively
12CD0.1cc–the minimum dose received by 0.1 cc of the cord.