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Compartment model for measuring myocardial oxygen consumption using [1-11C]acetate

K T Sun1, K Chen, S C Huang

  • 1Department of Molecular and Medical Pharmacology, UCLA School of Medicine 90095, USA.

Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
|March 1, 1997
PubMed
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A new kinetic model accurately estimates myocardial oxygen consumption (MVO2) using [1-11C]acetate PET scans. This method provides reliable MVO2 assessment across various physiological conditions.

Area of Science:

  • Cardiovascular Imaging
  • Nuclear Medicine
  • Physiology

Background:

  • [1-11C]acetate is a validated PET tracer for myocardial oxygen consumption (MVO2).
  • Current fitting methods provide only estimates of MVO2.
  • A need exists for a more direct MVO2 estimation method.

Purpose of the Study:

  • To develop and validate a simple tracer kinetic model for in vivo estimation of regional MVO2 using [1-11C]acetate.
  • To assess the model's performance across a range of physiological conditions.

Main Methods:

  • [1-11C]acetate PET imaging was performed in 12 anesthetized dogs (27 experiments).
  • Measurements were taken under baseline, ischemia, and pharmacologically induced changes in myocardial blood flow (MBF) and MVO2.
  • MVO2 was estimated using the developed PET model and compared with Fick method calculations and microsphere-derived MBF.

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Main Results:

  • The proposed kinetic model demonstrated excellent fit across all study conditions (R² = 0.985 ± 0.026).
  • Estimated MVO2 showed a strong linear correlation with measured MVO2 (r = 0.92).

Conclusions:

  • A simple tracer kinetic model enables reliable assessment of myocardial oxygen consumption (MVO2) using [1-11C]acetate PET.
  • This validated model can be used to assess MVO2 over a wide physiological range.