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Table 5 Median (range) dosimetric results for organs at risk and healthy tissue

From: Dosimetric comparison between helical tomotherapy and volumetric modulated arc-therapy for non-anaplastic thyroid cancer treatment

Organ Dose-volume index VMAT Helical tomotherapy P
Medullar canal D2% (Gy) 32.6 (30.1-39.0) 25.3 (23.0-34.6) 0.003*
PRV medullar canal D2% (Gy) 34.3 (31.6-40.4) 27.2 (24.1-35.1) 0.003*
I parotid gland V26Gy (%) 31.1 (0–42.6) 33.8 (0–45.9) 0.812
  Dmean (Gy) 19.9 (0–24.4) 19.5 (0–25.8) 0.812
C parotid gland V26Gy (%) 0 (0–49.3) 0 (0–47.3) 0.85
  Dmean (Gy) 6.6 (0–28.1) 4.3 (0–27.2) 0.032*
I submaxillary gland Dmean (Gy) 36.1 (15.4-44.6) 34.5 (24.7-44.6) 0.623
C submaxillary gland Dmean (Gy) 33.1 (3.4-41.9) 29.1 (1.5-39.6) 0.041*
Mandible D2% (Gy) 35.6 (1.4-52.2) 42.6 (0.9-58.0) 0.01*
Oral cavity Dmean (Gy) 17.2 (0.5-27.4) 17.8 (0.5-32.2) 0.075
Larynx D2% (Gy) 60.8 (49.2-64.9) 60.7 (43.6-65.0) 0.209
  Dmean (Gy) 45.9 (10.8-62.5) 39.2 (25.0-62.6) 0.638
Esophagus D2% (Gy) 60.9 (47.7-63.7) 57.5 (41.6-64.7) 0.049*
I brachial plexus D2% (Gy) 62.7 (44.1-67.4) 62.5 (46.4-64.6) 0.209
C brachial plexus D2% (Gy) 54.4 (29.7-58.5) 54.2 (26.8-55.1) 0.308
ID body (Joules) 138.5 (54.9-242.3) 149.5 (72.5-271.0) 0.008*
NTID (Joules) 117.0 (47.0-201.6) 124.6 (64.7-226.3) 0.008*
  1. Dx% = dose received by x% of structure volume; VxGy = percent structure volume of xGy; I = ipsilateral; C = controlateral.
  2. ID = Integral Dose; NTID = Normal Tissue Integral Dose; * = p < 0.05.