CT scan is not used routinely for imaging of the heart because it is not real time, is expensive, requires gating for accurate measurements, requires contrast injection, and involves radiation exposure. On the other hand it is used routinely for examinations of the chest, and although this examination is not tailored for cardiac evaluation, evaluation of the size and an estimate of the thickness of component structures is possible.
Volume measurements and wall thickness measurements requires a diastolic frame in order to standardize the measurement and also because there is thickening of the myocardium during systole as it shortens. This requires a gated study in order to determine the phase of the heart
However the size of the atria and to some extent the ventricles can be fairly accurately and subjectively assessed often by reviewing the shape of the chambers.
Comparing the Normal RV inflow with the Normal Left Ventricular Size
Courtesy Ashley DAvidoff MD copyright 2009 all rights reserved 37758b01c01.8s
Courtesy Ashley Davidoff MD copyright TCV 2008 75517
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