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Solid focal liver lesion characterisation with apparent diffusion coefficient ratios.

Tom Sutherland1, Emma Steele, Frans van Tonder

  • 1Medical Imaging Department, St Vincents Hospital, Melbourne, Victoria, Australia.

Journal of Medical Imaging and Radiation Oncology
|February 18, 2014
PubMed
Summary
This summary is machine-generated.

Diffusion-weighted imaging (DWI) shows overlap between benign and malignant liver lesions. Calculating the lesion-to-liver ratio did not improve diagnostic accuracy for differentiating these focal liver lesions.

Keywords:
diffusion-weighted imaginglesion characterisationliver imaging

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Area of Science:

  • Radiology
  • Medical Imaging
  • Oncology

Background:

  • Diffusion-weighted imaging (DWI) is used for non-invasive characterization of focal liver lesions.
  • Existing DWI methods show significant overlap between benign and malignant lesions, limiting diagnostic accuracy.
  • A novel approach involving a lesion-to-normal liver ratio was investigated to enhance categorization accuracy.

Purpose of the Study:

  • To evaluate the efficacy of apparent diffusion coefficient (ADC) ratios in differentiating benign from malignant focal liver lesions.
  • To determine if calculating a ratio of lesion ADC to adjacent normal liver ADC improves diagnostic accuracy.

Main Methods:

  • Retrospective review of 52 hepatic MRI studies with focal liver lesions (>10 mm) between April 2009 and September 2011.
  • Exclusion of cysts, hemangiomas, and patients with chronic liver disease.
  • Calculation of apparent diffusion coefficient (ADC) values for lesions and adjacent normal liver, and subsequent ratio computation.

Main Results:

  • Analysis of 58 lesions (47 benign, 11 malignant).
  • Mean ADC ratio for benign lesions to benign liver was 1.1005 (±0.3783 SD).
  • Mean ADC ratio for malignant lesions to malignant liver was 1.0890 (±0.4975 SD).
  • No statistically significant difference was found between benign and malignant lesion ratios (P > 0.5).

Conclusions:

  • Diffusion-weighted imaging (DWI) alone is insufficient for reliable differentiation of solid benign from malignant focal liver lesions.
  • The calculated lesion-to-liver ADC ratio does not significantly improve the accuracy of differentiating benign and malignant liver lesions.
  • Further research may be needed to identify more effective imaging biomarkers for liver lesion characterization.