Cardio-thoracic ratio

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The Cardio-thoracic ratio is defined as:

"The transverse diameter of the heart, as determined by x-ray examination, compared with that of the thoracic cage, used to help determine enlargement of the heart."[1]

This measurement is taken from PA x-rays.

References

  1. http://medical-dictionary.thefreedictionary.com/cardiothoracic+ratio