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Comparison of 16-frame and 8-frame gated SPET imaging for determination of left ventricular volumes and ejection fraction

  • Sachin M. Navare
  • Frans J. T. Wackers
  • Yi-Hwa LiuEmail author
Original Article

Abstract

Electrocardiographic (ECG) gated single-photon emission tomography (SPET) allows for simultaneous assessment of myocardial perfusion and left ventricular (LV) function. Presently 8-frame per cardiac cycle ECG gating of SPET images is standard. The aim of this study was to compare the effect of 8-frame and 16-frame gated SPET on measurements of LV volumes and to evaluate the effects of the presence of myocardial perfusion defects and of radiotracer dose administered on the calculation of LV volumes. A total of 86 patients underwent technetium-99m SPET myocardial perfusion imaging using 16-frame per cardiac cycle acquisition. Eight-frame gated SPET images were generated by summation of contiguous frames. Left ventricular end-diastolic volume (EDV), end-systolic volume (ESV) and ejection fraction (EF) were calculated from the 16-frame and 8-frame data sets. The patients were divided into groups according to the administered dose of the radiotracer and the size of the perfusion defect. Results. Sixteen frame per cardiac cycle acquisition resulted in significantly larger EDV (122±72 ml vs 115±68 ml, P<0.0001), smaller ESV (64±58.6 ml vs 67.6±59.5 ml, P<0.0001), and higher LVEF (55.3%±18% vs 49%±17.4%, P<0.0001) as compared to 8-frame SPET imaging. This effect was seen regardless of whether a high or a low dose was administered and whether or not significant perfusion defects were present. This study shows that EDV, ESV and LVEF determined by 16-frame gated SPET are significantly different from those determined by 8-frame gated SPET. The radiotracer dose and perfusion defects do not affect estimation of LV parameters by 16-frame gated SPET.

Keywords

Gated SPET LV volumes Ejection fraction 

Notes

Acknowledgements

We thank Anne-Marie Quirk M.D., for her assistance in data collection and Wendy Bruni, Jeff Pestallozi, Maryjo Zito, Maung Khin and Vera Tastkin for their technical support.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • Sachin M. Navare
    • 1
  • Frans J. T. Wackers
    • 1
    • 2
  • Yi-Hwa Liu
    • 1
    Email author
  1. 1.Section of Cardiovascular Medicine, Department of Internal MedicineYale University School of MedicineNew HavenUSA
  2. 2.Cardiovascular Nuclear Imaging LaboratoryYale University School of MedicineNew HavenUSA

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