Two dimensional echographic imaging of the left ventricle - Comparison of mechanical and phased array systems in vitro
Abstract
The accuracies of in vitro left ventricular images produced by two different phased array and two different mechanical systems for two-dimensional echocardiography are compared. Images were obtained of 22 short axis slices of three postmortem human hearts (one with infarction, one with left ventricular aneurysm, one with mitral regurgitation) by the Varian VR 3000 instrument using a 2.25 MHz, 84 deg sector angle transducer (phased array 1), IREX prototype with 2.25 MHz, 66 deg sector angle transducer (phased array 2), ATL Mark III with 3.0 MHz, 90 deg sector angle transducer (mechanical 1) and SKI EKO sector I with 2.25 MHz, 90 deg sector angle transducer (mechanical 2). Comparison of total, myocardial and cavity areas with calibrated photographs reveals excellent correlation for each echographic system. The ratios of echographic to photographic total left ventricular area and myocardial area are found to be near unity for all systems except mechanical 2, while all systems underestimated left ventricular cavity area, with mechanical system 2 giving significantly lower values than the other systems. It is concluded that accurate left ventricular image quantitation is possible with any of the systems tested if each variable studied is calibrated against an independent reference standard
- Publication:
-
American Journal of Cardiology
- Pub Date:
- October 1981
- Bibcode:
- 1981AmJC...48..728H
- Keywords:
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- Cardiac Ventricles;
- Echocardiography;
- Imaging Techniques;
- Phased Arrays;
- Aerospace Medicine;
- Biomedical Data;
- Clinical Medicine;
- Photographs;
- Communications and Radar