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Assessment of left ventricular ejection fraction using low radiation dose computed tomography

  • Original Article
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Journal of Nuclear Cardiology Aims and scope

An Erratum to this article was published on 20 June 2015

Abstract

Background

Cardiac CT is a non-invasive modality with the ability to estimate LVEF. However, given its limited temporal resolution and radiation, there has been initial resistance to use CT to measure LVEF. Developing an accurate, fast, low radiation dose protocol is desirable.

Objective

The objective of this study is to demonstrate that a ‘low radiation dose’ 64 slice cardiac computed tomography (CT) protocol is feasible and can accurately measure left ventricular ejection fraction (LVEF) while delivering a radiation dose lower than radionuclide angiography (RNA).

Methods

Patients undergoing RNA were prospectively screened and enrolled to undergo a ‘low-dose’ 64 slice CT LVEF protocol. LVEF measures, duration of each study and radiation dose between CT and RNA were compared.

Results

A total of 77 patients (mean age = 61.8 ± 12.2 years and 58 men) were analyzed. The mean LVEF measured by CT and RNA were 41.9 ± 15.2% and 39.4 ± 13.9%, respectively, (P = 0.154) with a good correlation (r = 0.863). Bland-Altman plot revealed a good agreement between the CT and RNA LVEF (mean difference of −2.4). There was good agreement between CT LVEF and RNA for identifying patients with LVEF ≤30% (kappa = 0.693) and LVEF ≥50% (kappa = 0.749). The mean dose estimated effective dose for CT and RNA were 4.7 ± 1.6 and 9.5 ± 1.0 mSv, respectively. The mean CT LVEF imaging duration (4:32 ± 3:05 minutes) was significantly shorter than the RNA image acquisition time (9:05 ± 2:36 minutes; p < 0.001).

Conclusion

The results of our study suggest that low-dose CT LVEF protocol is feasible, accurate, and fast while delivering a lower radiation dose than traditional RNA.

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Acknowledgments

Benjamin Chow is supported by the Saul and Edna Goldfarb Chair in Cardiac Imaging and receives research support from GE Healthcare and educational support from TeraRecon Inc. The study was funded in part by the UOHIAMO Innovations Fund.

Disclosures

No other authors have conflicts of interest to disclose.

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Corresponding author

Correspondence to Benjamin J. W. Chow MD, FRCPC, FACC, FASNC, FSCCT.

Additional information

See related editorial, doi:10.1007/s12350-015-0183-7.

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Yang, Y., Yam, Y., Chen, L. et al. Assessment of left ventricular ejection fraction using low radiation dose computed tomography. J. Nucl. Cardiol. 23, 414–421 (2016). https://doi.org/10.1007/s12350-015-0123-6

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  • DOI: https://doi.org/10.1007/s12350-015-0123-6

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