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. 2012 May 23;2:25. doi: 10.4103/2156-7514.96540

Figure 1.

Figure 1

Postero-anterior chest X-ray projection where the measure of the transverse diameter of heart shadow (TDH) is reported. The measure was taken by drawing a line near the middle of the heart shadow and the spine and a line from the right border to that line. Another line from the left heart border, drawn to the middle, was added. The two lengths were added together to derive the TDH.