ArticleVeterinary radiology & ultrasound : the official journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association2026
Radiographic Evaluation of Thoracic Inlet Diameter-Normalized Cardiac Silhouette Indices in Clinically Normal Young Adult Cats.
Article in Veterinary radiology & ultrasound : the official journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This prospective study aimed to establish reference values for thoracic inlet diameter-normalized radiographic indices to evaluate cardiac size in clinically healthy domestic shorthair cats. Standardized thoracic radiographs were obtained from 50 cats at defined respiratory phases. Two metrics were evaluated: the cardiac silhouette axis index, on the basis of the sum of orthogonal long and short axes, and the cardiac silhouette circumference index, derived from the total cardiac perimeter. The thoracic inlet diameter, readily measurable on right and left lateral thoracic radiographs, remained consistent regardless of laterality and respiratory phase and showed strong correlations with cardiac measurements (Pearson's r = 0.86-0.96), supporting its use as a reliable anatomic reference for standardizing cardiac dimensions. Mean cardiac silhouette axis index values at end-inspiration and end-expiration were 2.54 and 2.57 in the right lateral, 2.55 and 2.58 in the left lateral, 2.70 and 2.72 in the dorsoventral, and 2.68 and 2.71 in the ventrodorsal views. Corresponding cardiac silhouette circumference index values were 4.29 and 4.31 in the right lateral, 4.30 and 4.32 in the left lateral, 4.44 and 4.46 in the dorsoventral, and 4.42 and 4.43 in the ventrodorsal views. Unlike the axis index, which is restricted to orthogonal long and short cardiac axes, the circumference index integrates the entire cardiac silhouette. This yields a dimensionless, shape-sensitive parameter that potentially offers a more precise reflection of true cardiac size.
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