الفهرس 
Congenital Heart DiseaseOnly 14 pages are availabe for public view
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Abstract
Cardiac torsion is defined as the dynamic twisting component of cardiac motion about the apex-to-base axis as the heart contracts. This particular component of cardiac motion is not accounted for in routine myocardial perfusion single photon emission computed tomography (SPECT), even when such studies are acquired and processed in a gated fashion (I). Left ventricular torsion from helically oriented myofibers is a key parameter of cardiac performance but is difficult to measure. layers, where the direction of rotation is in favor of the epicardial layer(6). For the clockwise basal rotation, this is more complex,
because multiple fiber layers in various directions exist at this level(7).