Chest X Ray Normal Heart. The cardiothoracic ratio should not be measured on an ap chest x ray. Introduction to the chest x ray.
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The image on the right shows a mass in the right lung. On a normal lateral chest film the silhouette of the left diaphragm 2 can be seen from posterior up to where it is bordered by the heart which has the same density blue arrow. Objects nearer the x ray tube appear artificially enlarged due to divergence of the x ray beam resulting in the heart appearing artificially large on ap radiographs.
Introduction to the chest x ray.
If the ctr is 50 on either a posterior anterior pa or an anterior posterior ap view then the heart size is within normal limits. A normal measurement is 0 42 0 50. A measurement 0 42 is usually deemed to be pathologic. However a pa view is required to confidently diagnose cardiac enlargement.
