MRI for Liver Iron Quantification: Concepts and Current Methods.

Area of Science:

• Radiology
• Medical Imaging
• Biophysics

Background:

• Liver iron content is the primary indicator of total body iron stores and essential for diagnosing iron overload diseases.
• Historically, liver biopsy was the gold standard but is invasive, costly, and carries risks.
• Magnetic Resonance Imaging (MRI) has emerged as a preferred non-invasive method for liver iron evaluation.

Purpose of the Study:

• To review current MRI techniques for quantifying liver iron concentration.
• To discuss the advantages and disadvantages of various MRI methods.
• To highlight the clinical value of accurate liver iron quantification.

Main Methods:

• Review of established and emerging MRI techniques for liver iron quantification.
• Discussion of signal intensity ratio (SIR), T2 relaxometry, T2* relaxometry, and Dixon-based methods.
• Mention of advanced techniques like quantitative susceptibility mapping and ultrashort TE sequences, and dual-energy CT.

Main Results:

• Various MRI techniques can accurately quantify liver iron concentration.
• Each method has unique strengths and weaknesses regarding accuracy, reproducibility, and cost.
• Emerging techniques show promise for future clinical application.

Conclusions:

• Accurate liver iron quantification is achievable using current MRI technology available at most imaging centers.
• MRI provides a valuable, non-invasive tool for evaluating patients with iron overload diseases.
• Continued research into advanced MRI techniques may further enhance clinical utility.