Measurements of cardiac volumes based on biplane radiographic data exhibit a cyclical variation as the heart is rotated with respect to the radiologic instrumentation. This study develops a theoretical basis for evaluating the measurement errors due to orientation, that explains the cyclical variation. Since this type of measurement error is always one of overestimation, better accuracy will be obtained if several views are performed at varying orientations and the smallest of the resulting values is used as the measurement.
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