Fig. (2b) Sonographic measurement of the up- and downward movement of the lung silhouette – here on the right side. Underwards the arrowhead marked with I the different echogenicity separates between the lung and liver tissue at maximal end inspiration. To measure the distance the lung silhouette moved the distance between the E point in figure 2a and the I point in figure 2b has to be measured by scrolling the sonographic video. The cross indicates the rib`s ultrasound shadow.