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Updated: Aug 16, 2026

In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography
08:13

In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography

Published on: February 16, 2016

Tl-201 myocardial SPECT in differentiation of ischemic from nonischemic dilated cardiomyopathy in patients with left

Yen-Wen Wu1, Ruoh-Fang Yen, Poon-Ung Chieng

  • 1Department of Nuclear Medicine, National Taiwan University Hospital, No. 7 Chung-Shan South Road, Taipei, Taiwan.

Journal of Nuclear Cardiology : Official Publication of the American Society of Nuclear Cardiology
|August 6, 2003
PubMed

Insights

Thallium-201 SPECT shows modest value in differentiating ischemic from nonischemic cardiomyopathy in heart failure patients. The technique has limited ability to clearly distinguish individual cases due to overlapping scan patterns.

Area of Science:

  • Cardiology
  • Nuclear Medicine
  • Diagnostic Imaging

Background:

  • Differentiating ischemic and nonischemic cardiomyopathy is crucial for patient management.
  • Noninvasive diagnostic modalities are essential for this differentiation.
  • The diagnostic accuracy of thallium-201 single photon emission computed tomography (SPECT) remains uncertain.

Purpose of the Study:

  • To evaluate the effectiveness of thallium-201 SPECT in distinguishing ischemic cardiomyopathy from nonischemic dilated cardiomyopathy.
  • To assess the utility of Tl-201 SPECT in patients with chronic heart failure and reduced ejection fraction.

Main Methods:

  • Twenty-nine patients with chronic heart failure (LVEF ≤40%) were included: 14 with ischemic and 15 with nonischemic dilated cardiomyopathy.
  • Patients underwent Tl-201 SPECT using various stress protocols (exercise, dipyridamole, dobutamine).
  • Myocardial SPECT images were analyzed using a 17-segment model and a 0- to 4-point scoring system.

Main Results:

  • Ischemic cardiomyopathy patients exhibited higher summed stress defect scores (27.9 vs 20.6, P=.04) and more fixed defects (5.9 vs 3.8, P=.05).
  • A higher proportion of ischemic cardiomyopathy patients (71%) showed moderate/severe perfusion defects in ≥7 segments compared to nonischemic patients (20%, P=.016).
  • Significant overlap in SPECT patterns between the two groups was observed.

Conclusions:

  • Tl-201 myocardial SPECT provides only modest diagnostic value for differentiating nonischemic dilated cardiomyopathy from ischemic cardiomyopathy.
  • The technique is insufficient for clearly distinguishing individual patients with chronic heart failure.
Abstract

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