The Effect of Treatment of Emphysema With Endobronchial Valves on the Diaphragm Mobility

In some patients with chronic obstructive pulmonary disease (COPD) the breathlessness is caused by hyperinflation of the lungs. This causes difficulty breathing air out and makes it harder to breath in new air and limits the movement of the diaphram. The diaphragm is the muscle used for breathing between the chest and the stomach. Some of these patients can receive treatment with endobronchial valves, where one-ways are inserted into the bronchial system the let out some of the excess air, and thereby relieve breathlessness. The goal of this observational study is to investigate the effect of endobronchial valves on the mobility of the diaphragm in patients with chronic obstructive pulmonary disease. The main questions it aims to answer are: * If the movement of the diaphragm improves after treatment with endobronchial valves. * If there is a link between improvement of diaphragm funct