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Measurement of Tumor T2* Relaxation Times after Iron Oxide Nanoparticle Administration
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Published on: May 19, 2023

Liver Diffusion Weighted MRI: Effect of Iron Overload on Apparent Diffusion Coefficient.

Antonella Meloni1, Massimiliano Missere2, Vincenzo Positano1

  • 1Bioengineering Unit, Fondazione G. Monasterio CNR-Regione Toscana, Pisa, Italy.

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Summary

Liver iron overload significantly lowers liver apparent diffusion coefficient (ADC) values, particularly at higher b-values. This finding is crucial for accurate interpretation of diffusion-weighted imaging (DWI) in patients with beta-thalassemia.

Keywords:
diffusion magnetic resonance imagingiron overloadliver

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Area of Science:

  • Radiology
  • Medical Imaging
  • Biophysics

Background:

  • Beta-thalassemia patients often develop liver iron overload due to frequent blood transfusions.
  • Hepatic iron concentration (LIC) can lead to liver dysfunction and fibrosis.
  • Accurate, non-invasive assessment of LIC is critical for managing beta-thalassemia.

Purpose of the Study:

  • To evaluate the impact of hepatic iron levels on liver apparent diffusion coefficient (ADC) values measured by MRI.
  • To determine how different b-values influence the association between LIC and liver ADC.
  • To assess the clinical implications of liver iron overload on quantitative diffusion-weighted imaging (DWI).

Main Methods:

  • Prospective enrollment of 110 beta-thalassemia patients.
  • Acquisition of diffusion-weighted imaging (DWI) with varying b-values (200, 600, 1000 s/mm²).
  • Calculation of ADC values (ADC_200, ADC_600, ADC_1000) and measurement of liver T2* to estimate LIC.

Main Results:

  • A significant inverse correlation was observed between LIC and all measured ADC values (ADC_200, ADC_600, ADC_1000).
  • The correlation was strongest at higher b-values (ADC_600 and ADC_1000) compared to ADC_200.
  • Patients with liver iron overload showed significantly lower ADC_600 and ADC_1000 values.

Conclusions:

  • Liver iron overload is a significant confounding factor in quantitative liver DWI.
  • Higher b-values (ADC_600, ADC_1000) are more sensitive to the effects of hepatic iron.
  • Accounting for LIC is essential to prevent misinterpretation of liver ADC measurements in clinical practice.