The cardiothoracic ratio is calculated to assess heart size. How is this ratio determined?

Question

Answer

The width of the heart at the level of the carina divided by the width of the chest at the diaphragm

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The transverse diameter of the aorta divided by the transverse diameter of the heart

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Maximum horizontal thoracic width divided by the maximum horizontal cardiac width

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Maximum horizontal cardiac width divided by the maximum horizontal thoracic width (inner rib cage)

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Maximum vertical cardiac length divided by the maximum vertical thoracic length

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