The Dosimetric Impact of Shifts in Patient Positioning during Boron Neutron Capture Therapy for Brain Tumors
Table 5
Doses (± SD) of various normal tissues with tumor depths of 6.5 cm and 2.5 cm and with 0-3 cm head-shifts.
Organ
Baseline
LS1
LS2
LS3
OS1
OS2
OS3
Gy-Eq
Gy-Eq (± SD)
Gy-Eq (± SD)
Gy-Eq (± SD)
Gy-Eq
Gy-Eq
Gy-Eq
NB
3.82
1.64
3.78 (0.03)
1.62 (0.01)
3.63 (0.04)
1.56 (0.02)
3.42 (0.05)
1.46 (0.02)
3.64
1.56
3.47
1.49
3.30
1.41
12.26
5.25
11.99 (0.16)
5.14 (0.07)
11.70 (0.31)
5.01 (0.13)
11.50 (0.24)
4.93 (0.10)
11.63
4.98
11.17
4.78
10.72
4.59
CW
1.83
0.78
1.79 (0.08)
0.77 (0.04)
1.73 (0.20)
0.74 (0.09)
1.63 (0.26)
0.70 (0.11)
1.80
0.77
1.73
0.74
1.62
0.70
L-ON
0.85
0.36
0.81 (0.12)
0.35 (0.05)
0.83 (0.15)
0.36 (0.06)
0.84 (0.19)
0.36 (0.08)
0.82
0.35
0.76
0.33
0.68
0.29
R-ON
0.92
0.39
0.83 (0.07)
0.36 (0.03)
0.79 (0.14)
0.34 (0.06)
0.79 (0.24)
0.34 (0.10)
0.82
0.35
0.79
0.34
0.73
0.31
L-lens
0.29
0.12
0.29 (0.03)
0.12 (0.01)
0.30 (0.05)
0.13 (0.02)
0.29 (0.07)
0.12 (0.03)
0.32
0.14
0.24
0.10
0.21
0.09
R-lens
0.32
0.14
0.30 (0.03)
0.13 (0.01)
0.33 (0.10)
0.14 (0.04)
0.29 (0.10)
0.13 (0.04)
0.32
0.14
0.22
0.09
0.22
0.09
L-eye
0.37
0.16
0.36 (0.04)
0.15 (0.02)
0.38 (0.07)
0.16 (0.03)
0.37 (0.09)
0.16 (0.04)
0.35
0.15
0.32
0.14
0.29
0.13
R-eye
0.39
0.16
0.39 (0.04)
0.16 (0.02)
0.36 (0.08)
0.15 (0.03)
0.35 (0.13)
0.15 (0.05)
0.34
0.15
0.30
0.13
0.28
0.12
BS
4.04
1.73
3.86 (0.33)
1.65 (0.14)
3.74 (0.62)
1.60 (0.27)
3.53 (0.87)
1.51 (0.37)
3.75
1.61
3.53
1.51
3.36
1.44
Gy-Eq is the unit of the values reported. NB: normal brain; CW: Circle of Willis; L: left; R: right; ON: optic nerve; BS: brain stem. 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.
