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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)