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Table 3 Postshielding 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) Postshielding peripheral dose (cGy) Postshielding peripheral dose (%MU) Postshielding peripheral dose (%TD) Monitor units Prescribed dose (cGy) Isodose line (%)
12.5 22 3.11 0.09 0.14 3483 2200 80
25 16 32.80 0.32 1.64 10355 2000 70
20, 20, 10 17 19.80 0.15 1.24 12911 1600 70
12.5, 12.5, 10 16 38.36 0.29 2.95 13271 1300 70
20, 20, 7.5 15 27.50 0.19 1.96 14289 1400 70
15 15 29.50 0.20 1.97 14621 1500 70
35 20 20.37 0.14 1.13 15061 1800 70
12.5, 12.5, 7.5 20 17.60 0.09 0.98 20391 1800 70
10 20 12.13 0.06 0.67 20789 1800 70
5, 5, 5 18 59.44 0.29 2.97 20798 2000 70
7.5 18 14.19 0.07 0.65 20969 2200 70
10, 10, 5 17 50.40 0.21 2.40 24249 2100 70
7.5, 15, 15 16.5 59.64 0.23 3.31 25696 1800 70
10, 12.5, 20 19 19.79 0.07 1.24 26656 1600 75
5, 5, 10 19 23.13 0.08 1.29 29230 1800 70
5, 10, 12.5 19 45.80 0.15 2.41 29833 1900 70
5, 5, 5 17 55.80 0.17 2.66 32202 2100 70
7.5, 12.5, 20 16 160.88 0.49 8.04 33130 2000 70
5, 7.5, 12.5 18 35.22 0.08 1.96 42177 1800 70
7.5, 12.5, 12.5 18 42.45 0.10 1.57 43623 2700 75
  1. MU: Monitor Units
  2. TD: Prescribed Dose