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Related Experiment Video

Updated: Dec 27, 2025

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

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Development and feasibility of quantitative dynamic cardiac imaging for mice using μSPECT.

M A Guerraty1, L C Johnson2, E Blankemeyer2

  • 1Division of Cardiovascular Medicine, Department of Medicine, University of Pennsylvania, 11-145 South Perelman Tower, 3400 Civic Center Blvd, Philadelphia, PA, 19104, USA. marie.guerraty@pennmedicine.upenn.edu.

Journal of Nuclear Cardiology : Official Publication of the American Society of Nuclear Cardiology
|March 6, 2020
PubMed
Summary
This summary is machine-generated.

We developed quantitative imaging to assess mouse coronary microvascular function. This non-invasive approach measures blood flow and volume, aiding CMVD research.

Keywords:
Microvascular dysfunctionMyocardial blood flowSPECTSmall-animal imaging

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Area of Science:

  • Cardiovascular Imaging
  • Molecular Imaging
  • Mouse Models

Background:

  • Coronary microvascular disease (CMVD) lacks mechanistic understanding.
  • Mouse models are crucial for studying CMVD molecular processes.
  • Quantitative imaging is needed to assess coronary microvascular function in mice.

Purpose of the Study:

  • To develop quantitative mouse imaging techniques for assessing coronary microvascular function.
  • To enable mechanistic studies of coronary microvascular disease (CMVD) using mouse models.

Main Methods:

  • Utilized 99mTc-sestamibi with MILabs U-SPECT+ system for myocardial blood flow measurement in mice.
  • Determined influx rate constant (K1) and intramyocardial blood volume (IMBV) using SPECT imaging.
  • Employed 99mTc and stannous pyrophosphate for red blood cell imaging to assess IMBV.

Main Results:

  • Established a quantitative framework for measuring K1 (0.57 ± 0.08 min⁻¹) and IMBV changes.
  • Demonstrated a 22.9 ± 3.3% increase in IMBV in wild-type mice under hyperemic conditions.
  • Derived Renkin-Crone parameters (α=0.99, β=0.39) for 99mTc-sestamibi extraction fraction.

Conclusions:

  • Successfully developed a non-invasive µSPECT-based quantitative imaging framework for mouse microvascular function.
  • This method allows for the measurement of K1 and changes in IMBV, advancing CMVD research in mouse models.