Abstract
Measurements were obtained for the purpose of calculating cardiac volume with frontal and lateral chest X-rays (FFD: 200cm) from 792 subjects (611 males,131 females),20-70 years of age in human dock. Measurements of their height, weight, circumference of the chest and abdomen, ECG examinations, blood chemical analyses, and anamneses were completed within three days. With measurements obtained from biplane chest films, the author investigated the factors of sex, age, weight, height, and body-type which would possibly affect the size and shape of the cardiac silhouette. The subjects were separated into two groups (enlarged hearts and unenlarged or “normal hearts”) according to the diagnosis of the radiologist. Using measurements taken from the biplane chest films, six formulas (Vol/kg, Vol/m2, (Mr+Ml) / ID, (Mr+Ml)/2⋅√kg/m, L⋅B⋅d/ID⋅D, L⋅B/ID⋅CTR)were derived to obtain index values with which determinations could be made as to the extent of cardiac enlargement. With the index values obtained from these six formulas, quantitative evaluations of the cardiac silhouette were made.
A. Factors in Radiological Diagnosis
