Diagnosis and quantification of bronchiectasis using computed tomography or magnetic resonance imaging: A systematic review

•There are no validated objective criteria for bronchiectasis.•Airway-artery ratios are dependent on age.•To quantify bronchiectasis, 42 different scoring methods were described.•CT is the gold standard to diagnose bronchiectasis, but MRI is emerging.•The most frequent used criterion for bronchiectasis is an airway-artery ratio of more than 1.0.