Skip to main content

Table 8 Postshielding peripheral dose in the region of the pubic symphysis, expressed as a percentage of the monitor units and as a percentage of the prescribed dose.

From: Peripheral doses in patients undergoing Cyberknife treatment for intracranial lesions. A single centre experience

Collimator size (mm)

Distance (cm)

Postshielding peripheral dose (cGy)

Postshielding peripheral dose (%MU)

Postshielding peripheral dose (%TD)

Monitor units

Prescribed dose (cGy)

Isodose line (%)

12.5

63

1.24

0.04

0.06

3483

2200

80

25

71

3.94

0.04

0.20

10355

2000

70

20, 20, 10

72

5.75

0.04

0.36

12911

1600

70

12.5, 12.5, 10

70.5

4.62

0.03

0.36

13271

1300

70

20, 20, 7.5

71

5.66

0.04

0.40

14289

1400

70

15

67

5.34

0.04

0.36

14621

1500

70

35

83

6.66

0.04

0.37

15061

1800

70

12.5, 12.5, 7.5

82

7.26

0.04

0.40

20391

1800

70

10

87

6.23

0.03

0.35

20789

1800

70

5, 5, 5

68

4.64

0.02

0.23

20798

2000

70

7.5

82

8.06

0.04

0.37

20969

2200

70

10, 10, 5

74

9.18

0.04

0.44

24249

2100

70

5

76

7.26

0.03

0.40

24680

1800

80

10, 12.5, 20

70

10.04

0.04

0.63

26656

1600

75

5, 5, 10

74

11.76

0.04

0.65

29230

1800

70

5, 10, 12.5

73

11.52

0.04

0.61

29833

1900

70

5, 5, 5

80

11.64

0.04

0.55

32202

2100

70

7.5, 12.5, 20

69

13.08

0.04

0.65

33130

2000

70

5, 7.5, 12.5

73.5

18.66

0.04

1.04

42177

1800

70

7.5, 12.5, 12.5

88

13.89

0.03

0.51

43623

2700

75

  1. MU: Monitor Units
  2. TD: Prescribed Dose