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Table 4 Averaged dosimetric values for PTV and organ at risk

From: A treatment planning study comparing IMRT techniques and cyber knife for stereotactic body radiotherapy of low-risk prostate carcinoma

  HT Mean ± SD SW Mean ± SD VMAT Mean ± SD CK Mean ± SD
PTV
 V80 (%) 99.03 ± 0.63* 99.15 ± 0.59* 99.35 ± 0.44* 96.84 ± 2.48*
 D2% (Gy) 44.10 ± 0.72 45.41 ± 0.69 45.17 ± 0.26 44.08 ± 0.39
 D98% (Gy) 36.90 ± 0.41 36.86 ± 0.46 37.10 ± 0.27 35.82 ± 0.92
Urinary Bladder
 V18 Gy (%) 17.30 ± 12.88 15.46 ± 12.33* 15.52 ± 12.48* 22.51 ± 17.64*
 V36.25 Gy (%) 3.70 ± 3.49 4.24 ± 4.11 3.98 ± 3.75 4.04 ± 3.82
Rectum
 V18 Gy (%) 11.51 ± 3.87* 8.34 ± 3.13* 10.40 ± 4.45* 29.62 ± 13.79*
 V29 Gy (%) 2.72 ± 1.46* 2.18 ± 1.30* 2.99 ± 1.91* 8.11 ± 5.03*
 V32.6 Gy (%) 0.72 ± 0.59 0.82 ± 0.69 1.29 ± 1.11 3.10 ± 2.24
 V36.25 Gy (%) 0.01 ± 0.03 0.08 ± 0.11 1.22 ± 3.70 0.19 ± 0.25
Femoral head right
 V14.5 Gy (%) 0.05 ± 0.13* 11.21 ± 13.78 11.59 ± 18.60 2.04 ± 3.67
Femoral head left
 V14.5 Gy (%) 0.07 ± 0.18* 9.07 ± 11.04 10.16 ± 13.35 21.16 ± 13.75*
  1. Abbreviations: HT Helical tomotherapy, SW Sliding Window, VMAT Volumetric Modulated Arc Therapy, CK Cyber Knife, PTV Planning target volume, SD standard deviation, Dx (Gy) Dose (Gy) absorbed by the certain percent (%) or absolute volume (cc) of the countered structure, Vx Percent of OAR volume exposed to certain radiation dose; *- Values with statistically significant difference (p < 0.05)