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Related Experiment Videos

In vivo tissue characterization using magnetic techniques.

A A Carneiro1, G R Vilela, J B Fernandes

  • 1Departamento de Física e Matemática, FFCLRP, Universidade de São Paulo, Ribeirão Preto, SP, Brazil. adilton@biomag.usp.br

Neurology & Clinical Neurophysiology : NCN
|July 14, 2005
PubMed
Summary
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Magnetic Resonance Imaging (MRI) and Biomagnetic Liver Susceptometry (BLS) are non-invasive methods for quantifying liver iron. BLS is more effective than MRI for detecting high iron concentrations in patients with hemochromatosis.

Area of Science:

  • Medical Imaging
  • Biophysics
  • Hepatology

Background:

  • Iron overload, a condition requiring monitoring in patients with hemochromatosis or those receiving regular blood transfusions, can be quantified non-invasively.
  • Magnetic Resonance Imaging (MRI) and Biomagnetic Liver Susceptometry (BLS) are leading non-invasive diagnostic tools for assessing liver iron deposits.

Purpose of the Study:

  • To evaluate the clinical utility of MRI and BLS in quantifying hepatic iron deposits.
  • To compare the effectiveness of MRI and BLS in both transfused and non-transfused patient populations.

Main Methods:

  • Liver iron was assessed in 48 patients using both MRI and BLS.
  • MRI T2-weighted images were acquired using multi-slice single-spin-echo (SSE) and single-slice multi-spin-echo (MSE) sequences on a 1.5 T scanner.

Related Experiment Videos

  • BLS measurements utilized an AC superconducting susceptometer based on SQUID technology.

    • Main Results:

    • MRI effectively quantifies liver iron up to approximately 30 mg/g (dry tissue) with specialized pulse sequences.
    • For iron concentrations exceeding this threshold, BLS demonstrates superior performance due to MRI signal saturation at higher iron levels.

    Conclusions:

    • Both MRI and BLS are valuable non-invasive tools for liver iron quantification.
    • BLS offers an advantage over MRI in assessing severe iron overload in hepatic tissue.