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Related Experiment Videos

MRI estimation of the arterial input function in mice.

Stephen Pickup1, Rong Zhou, Jerry Glickson

  • 1Department of Radiology, University of Pennsylvania, B1 Stellar Chance Laboratories, 422 Curie Blvd., Philadelphia, PA 19104, USA.

Academic Radiology
|September 19, 2003
PubMed
Summary

A new MRI method accurately measures the arterial input function (AIF) in mouse models for cancer research. This technique is crucial for quantitative tumor perfusion analysis in small animals, but individual measurement is needed due to variability.

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Area of Science:

  • Biomedical Imaging
  • Cancer Research
  • Small Animal Models

Background:

  • Dynamic contrast-enhanced MRI (DCE-MRI) is vital for quantitative tumor perfusion analysis in cancer research.
  • Accurate extraction of the arterial input function (AIF) is essential for reliable DCE-MRI data interpretation.
  • Small animal models, particularly mice, are increasingly used for preclinical cancer studies, necessitating specialized imaging techniques.

Purpose of the Study:

  • To demonstrate an MRI-based method for determining the arterial input function (AIF) in a mouse model.
  • To establish a reliable technique for quantitative perfusion parameter mapping in preclinical cancer research.
  • To assess the feasibility and accuracy of AIF measurement in mice using DCE-MRI.

Main Methods:

  • Utilized a saturation-recovery gradient echo imaging sequence with EEG-gating.

Related Experiment Videos

  • Acquired short-axis cardiac images during the first pass of Gadodiamide.
  • Extracted the AIF from signal intensity changes in the left ventricle (LV) blood pool.

    • Main Results:

    • The developed technique achieved adequate temporal and spatial resolution for AIF characterization in mice.
    • Observed AIF in mice was qualitatively similar to that in larger animals.
    • Significant inter-animal variability in AIF was detected, highlighting the need for individual measurements.

    Conclusions:

    • The proposed MRI method is effective and reliable for determining the AIF in mice.
    • The observed inter-animal variability underscores the necessity of measuring the AIF for each animal in DCE-MRI studies.
    • This method supports advanced quantitative analysis of tumor perfusion in mouse models for cancer research.