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Spatial Distribution of Iron Within the Normal Human Liver Using Dual-Source Dual-Energy CT Imaging.

Andres F Abadia1, Katharine L Grant, Kathleen E Carey

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Dual-source dual-energy CT (DSDE CT) can assess liver iron distribution in healthy individuals. Most patients had low iron levels, but iron concentration varied regionally within the liver.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Hepatic iron overload can lead to liver disease.
  • Accurate assessment of iron distribution is crucial for diagnosis and management.
  • Noninvasive methods for quantifying liver iron are needed.

Purpose of the Study:

  • To evaluate the potential of dual-source dual-energy computed tomography (DSDE CT) for analyzing liver iron distribution.
  • To establish reference ranges and patterns of iron concentration in healthy livers.
  • To assess the uniformity of iron distribution in healthy subjects.

Main Methods:

  • A phantom study was conducted using iron nitrate solutions to establish a conversion factor for DSDE CT.
  • A 3-material decomposition algorithm was used to derive iron images.
  • Retrospective analysis of DSDE CT scans from 37 healthy patients was performed to quantify liver iron concentration and distribution.

Main Results:

  • A conversion factor of 0.15 mg Fe/mL per Hounsfield unit was determined.
  • Healthy livers showed mean iron concentrations ranging from 0.0 to 2.91 mg Fe/mL, with 94.6% below 1.0 mg Fe/mL.
  • Iron distribution was non-uniform in all patients, with higher concentrations observed in specific liver regions.

Conclusions:

  • DSDE CT is a viable tool for assessing liver iron distribution uniformity in healthy individuals.
  • Future research should explore DSDE CT for noninvasive assessment of hepatic iron content in diseased livers.
  • This technique may aid in the early detection and management of liver conditions related to iron metabolism.