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Table 2 Preshielding peripheral dose in the region of the thyroid gland, 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)

Preshielding peripheral dose (cGy)

Preshielding peripheral dose (%MU)

Preshielding peripheral dose (%TD)

Monitor units

Prescribed dose (cGy)

Isodose line (%)

12.5

20

5.00

0.12

0.25

4005

2000

84

10

20

6.48

0.12

0.32

5587

2000

75

20, 20, 20

22

15.22

0.13

0.76

11374

2000

75

5, 5, 5

20

23.01

0.13

1.15

18026

2000

75

7.5, 7.5, 15

16.5

35.38

0.17

1.97

20487

1800

79

10, 10, 15

14

164.90

0.69

6.60

23876

2500

75

20, 20, 20

14

40.55

0.16

1.62

25794

2500

67

5, 5, 5

18

59.43

0.22

3.30

27433

1800

76

7.5, 7.5, 15

19

35.73

0.13

1.99

28411

1800

75

7.5, 15, 25

14.5

132.15

0.33

5.29

39476

2500

70

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