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Table 5 Dose loss due to shoulder shifts

From: Assessment of shoulder position variation and its impact on IMRT and VMAT doses for head and neck cancer

   Frequency for losses of:
Shift Dose lost per fraction (cGy) 1 Gy 2 Gy 3 Gy
5 mm superior -3 33 -- --
15 mm superior -11 9 18 27
15 mm posterior -5 20 -- --
5 mm superior + 15 mm posterior -8 13 25 --
15 mm superior + 15 mm posterior -16 6 13 19
  1. Dose lost to 99% of the clinical target volume due to superior and posterior shifts and the number of shifts required for a D99% loss of 1, 2, or 3 Gy. Dashes represent > 35 fractions required.