text: In asthmatics, high-resolution CT may reveal several structural changes related to small-airway disease including cylindrical bronchiectasis, bronchial wall thickening, and air trapping. CT markers valid for small-airway disease can be derived from quantitative lung density measurements and these markers correlate with clinical severity, lung function test results and are also sensitive to demonstrate therapeutic effects. An FEV1/FVC ratio of 75% or more has been shown to be an important predictor of bronchial wall thickening and bronchiectasis; but has a low discriminatory utility for patients without structural airway changes (sensitivity, 67%; specificity, 65%). Thereby, suggesting the importance of radiological assessment of bronchial wall changes in patients with severe asthma.
option_0: Asthma CT
option_1: Asthma chest x ray
option_2: Chronic bronchitis CT
option_3: Asthma pulmonary function test
option_4: Status asthmaticus CT
option_5: Occupational lung disease CT
option_6: Alpha 1-antitrypsin deficiency CT
option_7: Cough CT