Table 1.

Inclusion and exclusion criteria for deeming an image of sufficient quality for reading

Inclusion	Exclusion
Postero-anterior film	Artefacts obscuring the view of the lung fields
A full view of lung fields – the whole thorax with the first rib, lateral ribs and costophrenic angles in view	Images acquired more than 4 weeks prior to pretreatment visit or more than 3 weeks after this
Adequate penetration of film to allow ribs and lung parenchyma to be distinguished