Dr M. Jotterand, MD
Dr K. Michaud, MD

Version 0.4 ( 03/07/2018 )

CTR Score Analysis

BMI:  kg/m2   
CTR Score:  
(sensitivity %;  specificity %;  % of cases are correctly classified)

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CTR Score

The cardiothoracic ratio (CTR) is used on Computed Tomography (CT) by living individuals and is considered to be a reliable indicator of cardiomegaly, with a threshold of 0.5.

CTR alone cannot be used to distinguish between normal heart weight and increased heart weight on PMCT. A new formula has been developed that includes age, gender and BMI. Dilatation of the cardiac chambers on CT, a finding not associated with cardiomegaly, is subjectively assessed and can influence CTR. The newly proposed formula excludes this subjective assessment and proposes a cut-off value of 32 for the diagnosis of cardiomegaly.

Published in : Jotterand M, Faouzi M, Dédouit F, Michaud K. New formula for cardiothoracic ratio for the diagnosis of cardiomegaly on post-mortem CT. Int J Legal Med. 2020 Mar;134(2):663-667. doi: 10.1007/s00414-019-02113-1. Epub 2019 Jul 25. PMID: 31346689.


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