Measurement of left-ventricular volumes using an internal standard |
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Authors: | Dr Eric Delcourt Philippe Franken Andre Lenaers |
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Institution: | (1) Départment de Médecine Nucléaire, Centre Hospitalier Universitaire de Montigny, 6110 Montigny-le-Tilleul, Belgium;(2) Service de Cardiologie, Centre Hospitalier Universitaire de Montigny, 6110 Montigny-le-Tilleul, Belgium;(3) Service des Radioisotopes, Hôpital Universitaire Saint-Pierre, 1000 Bruxelles, Belgium |
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Abstract: | When performing equilibrium radionuclide angiocardiography with two successive acquisition views, absolute left-ventricular volumes can be calculated using an internal standard generated by a computer in the left-ventricular cavity. The method is based on the computed ratio of maximum to global activity in the 40°-left-anterior-oblique view after background correction and on the measured depth of the left ventricle in almost-orthogonal, 30°-left-posterior-oblique Fourier first-harmonic images. The method does not require blood sampling or correction for self attenuation. The intra- and interobserver reproducibility is excellent, even in patients with severe impairment of the ventricular-contractility pattern. When compared with a classical method requiring venous-blood counting and an attenuation correction factor, the accuracy of the internalstandard method was fairly good, with a regression coefficient of 0.90. |
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Keywords: | Radionuclide angiocardiography Ventricular volume Internal standard |
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