Fifty human right ventricular cast specimens were subjected to X-ray cineangiography in biplane right anterior oblique and left anterior oblique (RAO/LAO) projection. From the silhouettes seen in the two projection planes we estimated areas and lengths using a light-pen minicomputer system and calculated the volumes using various methods. The calculated volume values were compared with the true values determined by water displacement. The methods were then arranged is order of decreasing accuracy. Criteria for judging model quality were the mean squared deviations, correlation coefficient, and residual variance. The most accurate calculation of the right ventricular volume was obtained with Ferlinz' method and our own empirical approach.
The volumes of 15 human right ventricular cast specimens were analyzed by computed tomography (CT) and compared with reference volumes and the values obtained by cineradiography. CT volumes were more accurate than those determined by cineradiography. The mean deviation between CT and reference volumes was 3.4%. The differences between cineradiographic values and reference volumes were 14 and 17%, respectively, for the 60 degree LAO projection, area-length method, and biplane 30 degree RAO/60 degree LAO projection, according to the Ferlinz method. The CT and cineradiographic volumes differed significantly in our experiment.
Axial cinematography of 15 cadaver cast models of the right ventricle was performed, using 16 different real and simulated single and biplane axial oblique projections. Heart volumes were then calculated by Dodge's area-length method and Ferlinz' method. In our volumetric studies of models, the smallest positive deviation from real volumes was 3.7% with the simulated long-axis projection (SLP2), evaluated from the frontal plane and calculated by the area-length method. Volumetric determinations of most usefulness, as ranked by mean differences and mean quadratic deviations, were achieved with the simulated long-axis projection, (SLP1--ranked third and SLP2--ranked first), evaluated from the frontal plane and calculated by Dodge's method; with biplane orientation and calculation by Ferlinz' method (SLP1 + SLP1C1-- ranked seventh, deviation from real volumes was 23%, SLP2 + SLP2C2--ranked fourth). We found that single-plane hepatoclavicular projection (HCP--ranked second and fifth), calculated by Dodge's or Ferlinz' method, as well as single-plane sitting-up projection (SUP--ranked sixth), calculated by the area-length method, were also acceptable for right ventricular volume measurements.
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