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Related Experiment Videos

Fat tissue: relationship between chemical shift and magnetization transfer

H Yoshioka1, H Onaya, I Anno

  • 1Department of Radiology, University of Tsukuba, Ibaraki, Japan.

Radiology
|May 1, 1995
PubMed
Summary

Researchers used magnetic resonance imaging (MRI) to study calf muscles. They observed periodic oscillations in fat tissue related to the water-fat chemical shift, offering new insights into MRI techniques.

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Magnetic Resonance Imaging

Background:

  • Magnetic Resonance Imaging (MRI) is a crucial non-invasive imaging modality.
  • Magnetization Transfer Contrast (MTC) enhances image contrast by targeting water and macromolecule protons.
  • Chemical Shift Imaging (CSI) differentiates tissues based on the resonant frequency of different nuclei, like water and fat.

Purpose of the Study:

  • To investigate the behavior of Magnetization Transfer Contrast (MTC) in biological tissues using a specific MRI sequence.
  • To explore the relationship between MTC effects and chemical shift differences in fat tissue.
  • To evaluate the application of gradient-recalled echo sequences combined with MTC and CSI in calf muscle imaging.

Main Methods:

  • 1.5-Tesla (T) MRI was employed to scan the calf muscles of 25 healthy volunteers (12 males, 13 females, aged 18-25 years) and phantoms.

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  • A gradient-recalled echo technique was utilized.
  • Magnetization Transfer Contrast (MTC) and Chemical Shift Imaging (CSI) were integrated into the MRI protocol.

    • Main Results:

    • Periodic oscillations in the MTC effect were detected within the fat tissue of the calf muscles.
    • These oscillations occurred at a frequency directly corresponding to the known water-fat chemical shift difference.
    • The findings demonstrate a quantifiable relationship between MTC and chemical shift in vivo.

    Conclusions:

    • The study successfully identified and characterized periodic MTC oscillations in fat tissue using advanced MRI techniques.
    • This observation provides a novel understanding of MTC behavior and its dependence on the water-fat chemical shift.
    • The combined MTC and CSI approach shows potential for detailed tissue characterization in musculoskeletal MRI.