The Comparison of Electronic Auscultation Coupled With CALSA and FRI; Repeatability of FRI Biomarkers

his is a study with no investigational product. CALSA will be compared with FRI and the repeatability of the FRI parameters will be tested in a group of healthy volunteers and asthma patients. Electronic auscultation of respiratory sounds will be performed, lung function tests (at maximal dilatation) will be executed and computed tomography (CT) scans of the thorax will be taken. The scans will be taken at two different breathing levels, more specifically at total lung capacity (TLC) and functional residual capacity (FRC) level. The scans will be taken while the patient/ volunteer lies down on the movable table of the CT-scan. After the scan is taken it will be asked to the patient/ volunteer to sit upright on the scanning table and to lie down again. When the patient/ volunteer lies down a second CT-scan (TLC and FRC) will be taken. The objective of this study is to compare CALSA with FRI and to assess the repeatability of FRI biomarkers