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Table 2 Comparison of geometric and dosimetric characteristics for tongue: SMP versus SCTDD

From: Development of a semi-customized tongue displacement device using a 3D printer for head and neck IMRT

Parameters SMP SCTDD p-value
Tongue volume 82.6 cm3 (73.1, 95.4) 80.5 cm3 (77.7, 100.5) 0.578
Percent of tongue volume outside the PTV 86.4% (84.9, 90.8) 91.3% (87.3, 91.9) 0.016a
V15 89.7% (83.3, 94.3) 79.9% (71.7, 81.9) 0.016a
V30 48.3% (46.1, 53.3) 37.8% (34.1, 40.9) 0.016a
V35 41.4% (37.9, 47.1) 30.6% (27.2, 34.5) 0.016a
V45 29.4% (27.4, 36.6) 22.7% (17.2, 24.2) 0.016a
V60 13.7% (8.0, 16.1) 7.4% (6.6, 12.6) 0.016a
Dmean 34.3 Gy (33.0, 35.5) 29.6 Gy (27.3, 30.4) 0.016a
Dmax 62.9 Gy (62.3, 69.3) 62.3 Gy (62.1, 69.0) 0.078
  1. Abbreviations: IQR interquartile range, SMP standard Mouthpiece, SCTDD semi-customized tongue displacement device, VD (15, 30, 35, 45, and 60) the percentage of the tongue volume that received D (15, 30, 35, 45, and 60) Gy or more, Dmean mean dose, Dmax maximum dose.
  2. aStatistically significant
  3. Values are presented as median (IQR Q1, Q3)