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Table 3 Target coverage in the C6-C7 region

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

  IMRT VMAT
  100% 98% 95% 100% 98% 95%
C6-C7       
   No shift 97 98 100 94 97 99
   5 mm superior 90 98 100 84 96 99
   15 mm superior 23 53 94 16 35 72
C7-T2       
   No shift 98 100 100 -- -- --
   15 mm posterior 89 99 100 -- -- --
  1. Percentage of the clinical target volume (CTV) in the C6-C7 region covered by the 100%, 98%, and 95% isodose lines with no shift and with superior shifts for IMRT and VMAT plans, as well as the percent coverage of the CTV in the C7-T2 region with no shift and a 15 mm posterior shift. All percentages were evaluated for Patient 1.