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

Radiation Oncology

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

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)	0.016^a
V₁₅	89.7% (83.3, 94.3)	79.9% (71.7, 81.9)	0.016^a
V₃₀	48.3% (46.1, 53.3)	37.8% (34.1, 40.9)	0.016^a
V₃₅	41.4% (37.9, 47.1)	30.6% (27.2, 34.5)	0.016^a
V₄₅	29.4% (27.4, 36.6)	22.7% (17.2, 24.2)	0.016^a
V₆₀	13.7% (8.0, 16.1)	7.4% (6.6, 12.6)	0.016^a
D_mean	34.3 Gy (33.0, 35.5)	29.6 Gy (27.3, 30.4)	0.016^a
D_max	62.9 Gy (62.3, 69.3)	62.3 Gy (62.1, 69.0)	0.078

Abbreviations: IQR interquartile range, SMP standard Mouthpiece, SCTDD semi-customized tongue displacement device, V_{D (15, 30, 35, 45, and 60)} the percentage of the tongue volume that received D (15, 30, 35, 45, and 60) Gy or more, D_mean mean dose, D_max maximum dose.
^aStatistically significant
Values are presented as median (IQR Q1, Q3)

ISSN: 1748-717X