“…Radiologists used the European Guidelines on Quality criteria, modified for supine radiographs, to intraindividually compare the quality of chest images. 7 The following criteria were rated: symmetrical reproduction of the thorax; reproduction of the whole rib cage above the diaphragm; visually sharp reproduction of vascular pattern in the whole lung, trachea and proximal bronchi, borders of the heart and aorta, diaphragm, and lateral costophrenic angles; visualization of retrocardiac lung, mediastinum, and spine through the heart shadow; and small round details in the whole lung, including the retrocardiac area.…”