Fig. 1

Normal lung. A normal lung ultrasound image acquired with a 15–6 MHz linear transducer. The ribs are visible with their anechoic shadows on both sides of the image. The pleural line is shown in between the ribs, indicated with two horizontal arrows. Emanating down from the pleural line are comet tails. B-lines (not visible here) also start at the pleural line, but extend all the way down to edge of the image