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Related Experiment Video

Updated: Jun 24, 2026

In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography
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Published on: February 16, 2016

Half-time SPECT myocardial perfusion imaging with attenuation correction.

Iftikhar Ali1, Terrence D Ruddy, Abdulaziz Almgrahi

  • 1Division of Cardiology, University of Ottawa Heart Institute, Ottawa, Ontario, Canada.

Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
|March 18, 2009
PubMed
Summary

Half-time (HT) myocardial SPECT imaging with new software provides diagnostic accuracy comparable to full-time (FT) imaging. This allows for reduced acquisition time, improving efficiency while maintaining clinical diagnosis concordance.

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Area of Science:

  • Nuclear Medicine
  • Cardiovascular Imaging
  • Medical Imaging Software

Background:

  • Reducing SPECT acquisition time can improve patient throughput and reduce costs.
  • However, shorter acquisition times typically increase image noise, potentially affecting diagnostic quality.
  • New software utilizing maximum a posteriori reconstruction with resolution recovery aims to mitigate noise while preserving resolution.

Purpose of the Study:

  • To compare the diagnostic performance of half-time (HT) gated myocardial SPECT images processed with ordered-subset expectation maximization with resolution recovery (OSEM-RR).
  • To evaluate HT images with and without CT-based attenuation correction (AC) against standard full-time (FT) SPECT imaging.
  • To assess the impact of reduced acquisition time on image quality, diagnostic accuracy, and clinical outcomes.

Main Methods:

  • 212 patients underwent rest/stress (99m)Tc-tetrofosmin gated SPECT, with both FT (12.5 min) and HT (6.0-7.5 min) acquisitions.
  • HT images were reconstructed using OSEM-RR (with/without AC); FT images used filtered backprojection (FBP) and OSEM (with/without AC).
  • Visual assessment by radiologists and automated analysis for left ventricular function and transient ischemic dilation (TID) were performed.

Main Results:

  • Significant correlations (P < 0.01) were observed between HT and FT measurements across all parameters.
  • OSEM-RR with AC showed a minor increase in TID (4%) compared to FT imaging.
  • Clinical diagnosis concordance between HT and FT was high (95-96%), similar to the test-retest repeatability of FT imaging (95%).

Conclusions:

  • Half-time gated myocardial SPECT imaging processed with the novel OSEM-RR algorithm achieves diagnostic concordance comparable to standard full-time imaging.
  • This approach effectively reduces acquisition time, enhancing efficiency without compromising clinical diagnostic accuracy.
  • The findings support the clinical utility of HT SPECT for improved patient throughput and resource utilization.