Dosimetric impact of tumor treating field (TTField) transducer arrays onto treatment plans for glioblastomas – a planning study

Table 3 Dose distribution and conformity on PTV2, resembling a target volume for a temporopolar glioblastoma

PTV2	Optimized Plan	Re-Calculation on Position A	Re-Calculation on Position B
PTV
D_max	63.8 Gy	63.8 Gy	63.3 Gy
D_2%	62.4 Gy	62.1 Gy	61.9 Gy
D_mean	59.6 Gy	59.1 Gy	59.0 Gy
D_50%	60.0 Gy	59.5 Gy	59.4 Gy
D_98%	53.5 Gy	52.9 Gy	53.1 Gy
D_min	45.4 Gy	42.4 Gy	45.9 Gy
Conformity (V_95%/PTV)	0.89	0.86	0.86
Homogenity ((D_2%-D_98%)/D_50%)	0.15	0.15	0.15
Chiasm
D_max	54.5 Gy	53.5 Gy	53.3 Gy
D_2%	52.7 Gy	52.3 Gy	52.4 Gy
D_mean	48.0 Gy	48.0 Gy	47.6 Gy
V_54Gy	< 0.01 cm³	0 cm³	0 cm³
V_50Gy	0.29 cm³	0.27 cm³	0.24 cm³
Left Optical Nerve
D_max	55.5 Gy	55.7 Gy	55.4 Gy
D_2%	54.7 Gy	54.7 Gy	54.6 Gy
D_mean	42.3 Gy	43.3 Gy	41.7 Gy
V_54Gy	0.02 cm³	0.02 cm³	0.02 cm³
V_50Gy	0.11 cm³	0.12 cm³	0.13 cm³
Right Optical Nerve
D_max	42.6 Gy	42.7 Gy	43.0 Gy
D_2%	39.3 Gy	40.4 Gy	39.9 Gy
D_mean	28.6 Gy	28.5 Gy	27.4 Gy
V_54Gy	0 cm³	0 cm³	0 cm³
V_50Gy	0 cm³	0 cm³	0 cm³
Brainstem
D_max	55.5 Gy	55.7 Gy	55.1 Gy
D_2%	52.7 Gy	52.6 Gy	52.2 Gy
D_mean	33.9 Gy	34.3 Gy	33.7 Gy
V_54Gy	0.09 cm³	0.10 cm³	0.02 cm³
V_50Gy	2.82 cm³	2.78 cm³	2.48 cm³

ISSN: 1748-717X