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Localized T1 measurements using an inversion-recovery OSIRIS method

F Girard1, P Poulet, J Steibel

  • 1Fondation pour la Recherche en Neurosciences Appliquées à la Psychiatrie, Rouffach, France.

NMR in Biomedicine
|November 1, 1993
PubMed
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This study introduces a novel method for localized T1 measurements using a modified OSIRIS scheme. This technique enhances accuracy for in vivo proton (1H) and fluorine (19F) imaging, with potential for oxygen level monitoring.

Area of Science:

  • Magnetic Resonance Imaging
  • Biomedical Engineering
  • Nuclear Magnetic Resonance

Background:

  • Accurate T1 measurements are crucial for quantitative MRI.
  • The OSIRIS (Outer-space Independent Refocusing Inversion recovery Sequence) method offers potential for T1 mapping.
  • Existing methods may have limitations in accuracy or applicability.

Purpose of the Study:

  • To develop and validate a new method for localized T1 measurements.
  • To improve the accuracy of T1 quantification using a modified OSIRIS sequence.
  • To explore the potential of this method for in vivo applications and oxygen sensing.

Main Methods:

  • Implementation of a modified OSIRIS sequence incorporating a non-selective 180-degree pulse prior to preparation.
  • Validation of the method using phantoms (test tubes).

Related Experiment Videos

  • In vivo accuracy assessment using two nuclei: proton (1H) and fluorine (19F).

    • Main Results:

    • The new method demonstrated accurate localized T1 measurements.
    • Successful verification of accuracy in both phantom and in vivo studies.
    • T1 values for 1H and 19F were accurately determined.

    Conclusions:

    • The presented method provides an accurate approach for localized T1 quantification.
    • The technique shows promise for in vivo MRI applications.
    • Further exploration into non-invasive in vivo oxygen tension (pO2) measurements using this inversion-recovery method is warranted.