Table 2 Mean % dose difference (quoted as a percentage of the absolute value calculated with AAA) to organs at risk calculated using AAA or AXB for a) RapidArc plans and b) 3D conformal radiotherapy (CRT) plans

Cord PRV D_max

−3.0% [−3.9%, −1.6%]

<0.05

Lung Mean

−1.7% [−5.2%, −0.4%]

<0.05

Lung V_20Gy

−2.7% [−8.3%, 0.0%]

<0.05

Heart Mean

−2.4% [−3.0%, −1.2%]

<0.05

Heart V_25Gy

−5.7% [−7.4%, −4.5%]

<0.05

Heart V_40Gy

−3.6% [−8.3%, −1.3%]

<0.05

Liver Mean

−1.2% [−2.2%, 0.0%]

NS

b)

OAR and dose metric

Mean difference [min, max] % (CRT_AAA) – (CRT_AXB)

p

Cord PRV D_max

−2.0% [ −8.2%, 2.7%]

<0.05

Lung Mean

−2.2% [ −4.5%, 0.3%]

<0.05

Lung V_20Gy

−1.5% [ −3.7%, 0.4%]

<0.05

Heart Mean

−2.6% [ −3.4%, −1.7%]

<0.05

Heart V_25Gy

−3.0% [−12.4%, −0.3%]

<0.05

Heart V_40Gy

−6.9% [−18.4%, −2.2%]

<0.05

Liver Mean

−1.5% [ −2.5%, 0.6%]

NS