Figure 1 Normal thorax in chest x-ray
a. On frontal view, the lung fields are divided by the dotted lines; b. On lateral view, the thin black line represents the right oblique fissure, the white line represents the horizontal fissure, and the thick black line represents the left oblique fissure.
Figure 2 Normal CT lung window
a, b. Trachea (T); c. Right upper lobe bronchus (rul); d. Right intermediate bronchus (BL), Left upper lobe bronchus (lul); e. Right middle lobe bronchus (rml); f. Left lower lobe bronchus (lll)
Figure 3 Normal interlobar fissures
a. On 5mm thick conventional CT, the oblique fissure is not well displayed and is manifested by zonate areas (↗) at the corresponding position of the oblique fissure; b. On thin-section high-resolution CT, the oblique fissure is clearly displayed and shows linear dense opacities (↗).
Figure 4 Pulmonary lobules on thin-section CT
a, b. Thin-thin high-resolution CT images show the pulmonary lobules are polygonal (↗), the peripheral linear dense opacities represent the interlobular septa, and the central punctate dense opacities are the lobular cores. (Note: To clearly show the structure of the pulmonary lobules, the pulmonary lobules are not completely normal, with mild thickening of the interlobular septa.)
Figure 5 Normal mediastinum on contrast-enhanced CT
a. Thoracic inlet level, 1. Right brachiocephalic vein 2. Trachea 3. Left common carotid artery 4. Left subclavian artery 5. Esophagus
b. Manubrium level, 1. Innominate artery 2. Right brachiocephalic vein 3. Trachea 4. Left subclavian artery 5. Esophagus
c. Aortic arch level, 1. Superior vena cava 2. Trachea 3. Aortic arch 4. Esophagus
d. Aortic window level, 1. Ascending aorta 2. Superior vena cava 3. Azygos vein 4. Trachea 5. Descending aorta
e. Tracheal bifurcation level, 1. Ascending aorta 2. Esophagus 3. Main pulmonary artery 4. Left main bronchus 5. Descending aorta
f. Four-chamber heart level, 1. Right ventricle 2. Right atrium 3. Left ventricle 4. Left atrium 5. Descending aorta
