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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