The Dosimetric Impact of Shifts in Patient Positioning during Boron Neutron Capture Therapy for Brain Tumors

Table 1

Mean tumor dose () and 80 % dose () with a lateral shift (LS) of the phantom model parallel to the beam exit surface and with an outward shift (OS) with an air gap between the phantom model and the beam exit surface.

Tumor; depth & dose	Baseline; Gy-Eq	LS1; Gy-Eq; (± SD)	LS2; Gy-Eq; (± SD)	LS3; Gy-Eq; (± SD)	LS1 vs. Baseline; P-value	LS2 vs. Baseline; P-value	LS3 vs. Baseline; P-value	OS1; Gy-Eq; (± SD)	OS2; Gy-Eq; (± SD)	OS3; Gy-Eq; (± SD)
	24.31	23.95; (± 0.16)	23.02; (± 0.32)	21.56; (± 0.30)	0.01	< 0.001	< 0.001	22.19	21.43	20.21
	20.00	19.52; (± 0.14)	18.50; (± 0.53)	17.67; (± 0.24)	< 0.001	0.01	< 0.001	18.25	17.75	16.73
	20.69	20.51; (± 0.19)	19.84; (± 0.17)	18.75; (± 0.22)	0.072	0.001	< 0.001	19.81	18.43	17.52
	20.00	19.85; (± 0.18)	18.66; (± 0.71)	17.67; (± 0.26)	0.053	0.014	< 0.001	18.50	17.79	16.96

D: dose; LS1: 1 cm lateral shift; LS2: 2 cm lateral shift; LS3: 3 cm lateral shift; OS1: 1 cm outward shift; OS2: 2 cm outward shift; OS3: 3 cm outward shift. The mean doses reported for LS1, LS2, and LS3 represent the mean values of the doses for left/right and superior/inferior shifts.