Chest radiograph interpretation in children — branching viva

Emergency department: a 4-year-old with fever, cough, and increased work of breathing has a chest radiograph performed. The examiner asks how you would assess the technical quality before reading the fields, then how you would apply a systematic approach, then branches to the infant whose film shows a right upper mediastinal opacity, to the toddler with a choking episode and a normal inspiratory film, and finally to the principle that governs whether the film should have been requested at all.