Estimation of left ventricular ejection fraction by computerized single cardiac probe system with echocardiogram

Conference · Sun Jan 01 00:00:00 EST 1984 · J. Nucl. Med.; (United States)

OSTI ID:6575207

Suzuki, Y; Ide, M; Kenemoto, N; Tomoda, H; Nakamura, M

The authors developed a computerized single cardiac probe system combined with echocardiogram which permits the physician to position the detector more easily and properly. With this system left ventricular ejection fraction (LVEF) can be estimated by the three different modes: first pass (FP) mode, beat-by-beat (B-B) mode and ECG multigated (MG) mode. In FP mode complex demodulation technique is applied for estimation of the background counts. The purpose of this paper is to describe the accuracy and reproducibility of the LVEF estimated by this system. In 40 patients with various heart diseases, the LVEFs estimated by this system using above-mentioned 3 modes were compared with those of obtained by gamma camera. There were good correlations between the LVEFs estimated by each of the 3 modes of this system and obtained by gamma camera. The correlation coefficient (r) between the LVEFs estimated FP mode, B-B mode and MG mode, and those of by gamma camera was 0.938, 0.932, and 0.930, respectively. In 15 patients FP mode study was repeated continuously and LVEFs obtained in the initial and repeat studies were compared. There was good agreement between these results (r=0.953). In 12 patients positioning of the probe over the left ventricle and background area was repeated 5 times and LVEFs were estimated each time by B-B mode. There was no significant standard deviation compared to the mean LVEFs in each patient; the percent coefficient of variation was less than 8.0%. The authors conclude that their results suggest that LVEF can be estimated accurately be each of the 3 modes of this system and reproducibility seems to be sufficient for clinical studies.

• Research Organization: Tokai Univ., School of Medicine, Isehara-city
• OSTI ID: 6575207
• Report Number(s): CONF-840619-; TRN: 87-018901
• Journal Information: J. Nucl. Med.; (United States), Vol. 25:5; Conference: 31. annual meeting of the Society of Nuclear Medicine, Los Angeles, CA, USA, 5 Jun 1984
• Country of Publication: United States
• Language: English

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