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Table 3 Radiation dose parameters

From: Prospective evaluation of a hydrogel spacer for rectal separation in dose-escalated intensity-modulated radiotherapy for clinically localized prostate cancer

 

PTVCP

Spacer union

Rectum union

EUD (Gy)

Mean dose (Gy)

Mean dose (Gy)

V75 (%)

V70 (%)

V65 (%)

V40 (%)

Pat 1

75.8

72.8

38.0

0.2

1.7

7.9

43.4

Pat 2

76.8

75.9

42.0

3.8

16.0

24.7

58.5

Pat 3

76.3

74.2

41.4

2.8

11.3

21.3

56.8

Pat 4

75.7

72.3

40.4

0.7

5.0

14.4

57.1

Pat 5

76.6

74.1

42.0

3.2

11.2

19.0

58.5

Pat 6

75.4

72.9

40.5

3.7

14.9

23.8

50.9

Pat 7

75.8

73.2

47.8

1.1

13.1

24.4

73.2

Pat 8

76.9

77.8

29.5

1.1

7.2

11.7

34.3

Pat 9

76.6

75.6

41.3

3.1

11.8

19.8

60.6

Pat 10

75.7

71.9

40.6

0.5

8.8

18.7

56.4

mean±SD

76.2±0.51

74.1±1.8

40.4±4.3

2.0±1.4

10.1±4.2

18.5±5.3

55.0±9.9

  1. Dose coverage in the PTV was evaluated based on the EUD in the PTVCP (union of three single CTVs with a 7 mm margin weighted by the coverage probability). Rectal doses were described by DVH-parameters.
  2. Abbreviations
  3. DVH – dose volume histogram.
  4. EUD – equivalent uniform dose.
  5. Gy – Gray.
  6. Pat – patient.
  7. PTVCP – coverage probability-planning target volume.
  8. SD – standard deviation.
  9. V – volume receiving respective radiation dose in Gy or more.