Values expressed as deviation or as measures of frequency, as appropriate. See details in the text. Air trapping was analyzed only in scans with an expiratory phase. #In 19 patients, the images could not be recovered for prospective analysis. BMI: body mass index; CCI: Charlson’s comorbidity index (0-37); ICS: inhaled corticosteroid; LABA: long-acting beta agonist; SABA: short-acting beta agonist; LAMA: long-acting muscarinic antagonist; SAMA: short-acting muscarinic antagonist; SpO2: peripheral oxygen saturation; FVC: forced vital capacity; FEV1: forced expiratory volume in the first second; SGRQ: Saint George’s Hospital Questionnaire, scores presented as mean and SD (range 0-100).