Table 3.
The differences of D2 cc values between the reference dataset and either original DVH parameter addition or a revised addition method when two different EBRT techniques, 3DCRT and IMRT were compared. EBRT cases with PA or PM boosts were excluded for this analysis. No statistically significant differences were recorded (p > 0.3148)
| Organ | 3DCRT [% (GyEQD2)]a | IMRT [% (GyEQD2)]a | Difference Between 3DCRT and IMRT [% (GyEQD2)]b | |||
|---|---|---|---|---|---|---|
| ∆D2ccEQD2 Mean | ∆D2ccEQD2 Std Dev | ∆D2ccEQD2 Mean | ∆D2ccEQD2 Std Dev | ∆D2ccEQD2 Mean | P‐value | |
| Current DVH parameter addition with Uniform EBRT Rx Dose Assumption | ||||||
| Conformal HDR Plan | ||||||
| Rectum | −3.8 (−2.3) | 1.8 (1.2) | −3.9 (−1.9) | 8.4 (5.3) | 0.1 (−0.4) | 0.9053 |
| Bladder | −5.0 (−3.7) | 9.2 (6.3) | −6.2 (−4.8) | 2.9 (2.3) | 1.2 (1.1) | 0.6913 |
| Sigmoid | −8.2 (−4.7) | 5.4 (2.8) | −7.1 (−4.5) | 2.5 (1.5) | −1.1 (−0.2) | 0.4407 |
| Point A HDR Plan | ||||||
| Rectum | −2.1 (−1.4) | 3.1 (2.2) | −3.6 (−2.3) | 6.7 (4.6) | 1.5 (0.9) | 0.8845 |
| Bladder | −3.9 (−3.1) | 5.4 (4.9) | −1.8 (−1.0) | 7.6 (7.7) | −2.1 (−2.1) | 0.7509 |
| Sigmoid | −7.3 (−4.7) | 5.9 (2.7) | −4.9 (−3.5) | 6.8 (5.0) | −2.4 (−1.2) | 0.8157 |
| Revised DVH parameter addition | ||||||
| Conformal HDR Plan | ||||||
| Rectum | −3.4 (−2.0) | 8.6 (4.9) | −1.9 (−1.1) | 1.2 (0.7) | −1.5 (−0.9) | 0.9949 |
| Bladder | −2.2 (−1.9) | 10.0 (7.6) | −2.7 (−2.1) | 1.6 (1.4) | 0.5 (0.3) | 0.5071 |
| Sigmoid | −5.7 (−3.2) | 9.4 (4.5) | −2.6 (−1.8) | 1.8 (1.3) | −3.1 (−1.4) | 0.3149 |
| Point A HDR Plan | ||||||
| Rectum | +1.6 (+1.4) | 4.6 (3.5) | −1.3 (−0.8) | 1.4 (1.0) | 2.9 (2.2) | 0.7352 |
| Bladder | +0.5 (+0.6) | 5.0 (5.0) | +1.2 (+1.8) | 7.2 (7.8) | −0.8 (−1.2) | 0.8419 |
| Sigmoid | −0.4 (−0.4) | 3.2 (2.4) | −0.7 (−0.5) | 6.7 (5.5) | 0.3 (0.1) | 0.9156 |
a
Negative sign refers the values of current/revised DVH parameter addition underestimate when compared to the reference datasets.
b
The values = 3DCRT – IMRT. Thus, negative signs refers IMRT values are bigger than 3DCRT values.