Table 1.

Prespecified normal tissue doses (specified to a volume of 1 cc)

Organ at risk	Prespecified normal tissue doses
Brachial plexus	Maximum dose=EQD2≤66 Gy
Heart	Maximum dose=EQD2≤76 Gy Mean dose ≤46 Gy
Lung	Mean lung dose (lung—GTV) ≤20 Gy
Mediastinal envelope*	Maximum dose=EQD2≤76 Gy
Spinal canal PRV	Maximum dose=EQD2≤50 Gy

*Including: heart, proximal bronchial tree, trachea, oesophagus and the blood vessels in the upper mediastinum.

EQD2, equivalent dose in 2 Gy fractions; GTV, gross tumour volume; PRV, planning organ at risk volume.