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Does IVIM measure classical perfusion?

R M Henkelman1

  • 1Department of Medical Biophysics, University of Toronto, Ontario, Canada.

Magnetic Resonance in Medicine
|December 1, 1990
PubMed
Summary
This summary is machine-generated.

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This study clarifies that intravoxel incoherent motion (IVIM) measurements cannot quantify classical tissue perfusion. Misinterpretations arise from confusing tissue uptake with blood flow dynamics.

Area of Science:

  • Biomedical Imaging
  • Physiology
  • Magnetic Resonance Imaging (MRI)

Background:

  • Magnetic resonance imaging (MRI) using motion-encoding gradients offers insights into tissue diffusion.
  • These techniques have been explored for measuring tissue perfusion, a critical physiological parameter.
  • Intravoxel incoherent motion (IVIM) is one such technique under investigation for perfusion assessment.

Purpose of the Study:

  • To elucidate the limitations of IVIM in measuring classical tissue perfusion.
  • To address the underlying reasons for the misapplication of IVIM in perfusion quantification.
  • To differentiate between terminal deposition/uptake and true blood volume flow.

Main Methods:

  • Theoretical analysis of IVIM principles in relation to perfusion.

Related Experiment Videos

  • Comparison of IVIM parameters with established perfusion measurement concepts.
  • Examination of the physical basis of signal decay in diffusion and perfusion MRI.

    • Main Results:

    • IVIM measurements are fundamentally incapable of quantifying perfusion in the classical sense.
    • Attempts to use IVIM for perfusion measurement stem from a misunderstanding of perfusion dynamics.
    • IVIM signal characteristics are more related to micro-capillary exchange and tissue deposition than to bulk blood flow.

    Conclusions:

    • IVIM is not a suitable method for classical perfusion quantification.
    • Distinguishing between tissue uptake and blood volume flow is crucial for accurate physiological assessment.
    • Further research is needed to clarify the specific physiological processes measurable by IVIM.