Table 2 Dose volume histogram (DVH) parameters in the six pilot institutes (I–VI)

Dose to PTV (homogeneity) (%)^a

 D98% (SD)

92.0 (3.2)

94.9 (2.2)

95.2 (1.6)

96.0 (1.4)

93.4 (4.9)

95.4 (1.1)

 D2% (SD)

104.0 (0.7)

104.0 (0.6)

104.0 (1.0)

103.0 (0.8)

104.0 (0.8)

104.0 (1.5)

 Dmean (SD)

99.7 (0.7)

100.0 (0.4)

100.0 (0.7)

100.0 (0.9)

100.0 (0.5)

101.0 (0.6)

Dose to OAR (Gy)

 MHD (SD)^b

0.8 (0.3)

1.7 (1.2)

1.5 (0.5)

0.9 (0.3)

1.0 (0.2)

1.8 (1.4)

 D2% heart (SD)^b

2.8 (1.1)

8.3 (6.5)

7.2 (6.3)

4.1 (3.1)

3.3 (0.9)

13.7 (14.4)

 MLD (SD)^a

2.1 (0.5)

2.9 (0.9)

2.8 (0.8)

2.9 (0.7)

2.3 (0.6)

3.3 (1.0)