Table 2.
Coverage of potential ECE
| Axial plane 1 cm caudal to the base | Mean (mm) | Range (mm) | Distance ≥ 3 mm (%) | Distance ≥ 4 mm (%) | Distance ≥ 5 mm (%) | Distance ≥ 6 mm (%) | Distance ≥ 7 mm (%) |
|---|---|---|---|---|---|---|---|
| Anterior |
7.82 |
1.10 – 14.42 |
95% |
88% |
85% |
73% |
61% |
| Left |
8.59 |
4.47 – 18.46 |
100% |
100% |
95% |
85% |
73% |
| Right |
8.41 |
4.62 – 18.15 |
100% |
100% |
95% |
71% |
59% |
| Left posterolateral |
11.42 |
3.11 – 27.02 |
100% |
98% |
88% |
83% |
76% |
| Right posterolateral |
11.03 |
3.12 – 27.02 |
100% |
98% |
88% |
80% |
73% |
| Posterior |
1.92 |
−0.66 – 6.070 |
20% |
7% |
5% |
2% |
0% |
| Distance from rectum to prostate capsule |
2.41 |
0 – 17.01 |
|
|
|
|
|
|
Axial plane at mid-prostate |
Mean (mm) |
Range (mm) |
Distance ≥ 3 mm (%) |
Distance ≥ 4 mm (%) |
Distance ≥ 5 mm (%) |
Distance ≥ 6 mm (%) |
Distance ≥ 7 mm (%) |
| Anterior |
9.01 |
4.42 – 17.32 |
100% |
100% |
98% |
76% |
68% |
| Left |
8.48 |
4.47 – 16.12 |
100% |
100% |
98% |
88% |
66% |
| Right |
7.57 |
3.53 – 15.20 |
100% |
98% |
90% |
76% |
49% |
| Left posterolateral |
7.87 |
2.04 – 26.86 |
98% |
95% |
83% |
61% |
51% |
| Right posterolateral |
7.60 |
0 – 20.10 |
95% |
85% |
78% |
68% |
51% |
| Posterior |
1.97 |
−0.66 – 4.86 |
29% |
12% |
0% |
0% |
0% |
| Distance from rectum to prostate capsule |
0.87 |
0 – 3.58 |
|
|
|
|
|
|
Axial plane 0.5 cm cranial to apex |
Mean (mm) |
Range (mm) |
Distance ≥ 3 mm (%) |
Distance ≥ 4 mm (%) |
Distance ≥ 5 mm (%) |
Distance ≥ 6 mm (%) |
Distance ≥ 7 mm (%) |
| Anterior |
9.53 |
3.56 – 15.38 |
100% |
95% |
95% |
95% |
83% |
| Left |
13.40 |
7.64 – 22.09 |
100% |
100% |
100% |
100% |
100% |
| Right |
12.28 |
5.55 – 21.36 |
100% |
100% |
100% |
98% |
95% |
| Left posterolateral |
7.25 |
0 – 17.34 |
93% |
85% |
73% |
61% |
44% |
| Right posterolateral |
7.27 |
0 – 15.81 |
98% |
93% |
85% |
68% |
51% |
| Posterior |
2.86 |
0 – 6.83 |
41% |
24% |
12% |
2% |
0% |
| Distance from rectum to prostate capsule | 0.79 | 0 – 3.50 |
Mean distance (mm) with range between the prostatic capsule and the 33 Gy isodose line, with the percent of patients where the distance is greater than or equal to 3, 4, 5, 6, and 7 mm. The mean distance between the prostatic capsule and the rectum is also noted.