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Table 3 Relative foetal dose reduction rate with and without each part of 10 mm shielding device. The point of measurement is from 30 cm at the field edge and 10 cm depth from the surface

From: Evaluation of a new foetal shielding device for pregnant brain tumour patients

 

Part A (%)

Part B (%)

Part C (%)

Parts A + B (%)

Parts A + C (%)

Parts B + C (%)

Parts A + B + C (%)

VMAT

 6 MV

17.92

20.75

23.58

26.42

29.25

31.13

36.79

 6 MV FFF

21.05

22.11

23.16

28.42

30.53

31.58

35.79

IMRT

 6 MV

21.50

26.41

15.37

31.31

22.73

22.73

34.99

 6 MV FFF

22.22

22.22

13.58

25.93

25.93

20.99

33.77

  1. VMAT volumetric modulated arc therapy, IMRT intensity-modulated radiation therapy, FFF flattening filter-free, Part A neck shielding, Part B body shielding, Part C back shielding