||At this seminar I will present the work I did during my study visit at Andes University in Colombia. Acute Respiratory Distress Syndrome (ARDS) presents a high mortality rate in intensive care units. Fast and accurate analysis of lung aeration on CT images may contribute to reduce the mortality rate in ARDS. An important step in the process is the airway tree skeleton extraction and airway tree segmentation. During my stay I improved the algorithm for fast vascular centerline tree extraction and modified it to segment the airway tree in CT images of piglets.