Table 2 Dosimetric comparison of target and organs at risk before and after spacer insertion
Before spacer (n = 40) | After spacer (n = 40) | P | |
|---|---|---|---|
Mean (± S.D.) | Mean (± S.D.) | ||
Prostate, ml | 42.2 (± 21.4) | 39.6 (± 20.8) | < 0.01 |
Seminal vesicles, ml | 13.6 (± 5.3) | 13.2 (± 5.3) | 0.34 |
PTV, ml | 100.1 (± 36.2) | 99.1 (± 36.7) | 0.43 |
Bladder, ml | 202.1 (± 102.8) | 274.7 (± 132.2) | < 0.01 |
Rectum, ml | 49.0 (± 13.0) | 49.1 (± 22.2) | 0.96 |
PTV mean, Gy | 37.3 (± 0.3) | 37.2 (± 0.3) | 0.32 |
PTV max, Gy | 39.1 (± 0.6) | 39.0 (± 0.6) | 0.20 |
Urethra max, Gy | 38.3 (± 0.6) | 38.3 (± 0.6) | 0.96 |
Rectum mean, Gy | 16.4 (± 1.2) | 15.1 (± 1.4) | < 0.01 |
Rectum max, Gy | 38.3 (± 0.6) | 36.9 (± 1.8) | < 0.01 |
Rectum V100%, % | 3.0 (± 1.2) | 0.4 (± 0.6) | < 0.01 |
Rectum V90%, % | 9.6 (± 2.2) | 2.2 (± 2.2) | < 0.01 |
Rectum V80%, % | 14.9 (± 2.7) | 4.9 (± 3.5) | < 0.01 |
Rectum V75%, % | 17.5 (± 2.9) | 6.8 (± 4.1) | < 0.01 |
Rectum V50%, % | 34.6 (± 3.1) | 27.3 (± 5.9) | < 0.01 |
Bladder mean, Gy | 12.4 (± 3.4) | 10.6 (± 3.8) | < 0.01 |
Bladder max, Gy | 38.7 (± 0.6) | 38.5 (± 0.6) | 0.30 |
Bladder V100%, % | 4.8 (± 2.1) | 3.8 (± 1.8) | < 0.01 |
Bladder V50%, % | 26.2 (± 9.0) | 22.6 (± 9.9) | < 0.01 |
Femoral head max, Gy | 15.9 (± 1.9) | 15.0 (± 1.4) | 0.01 |
Penile bulb max, Gy | 28.9 (± 8.1) | 24.0 (± 10.6) | < 0.01 |