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Table 2 Coverage of potential ECE

From: Hypofractionated stereotactic body radiation therapy as monotherapy for intermediate-risk prostate cancer

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      
  1. 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.