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Abdominal Radiology

, Volume 42, Issue 2, pp 468–477 | Cite as

Evaluation of fibrosis and inflammation in diffuse liver diseases using intravoxel incoherent motion diffusion-weighted MR imaging

  • Manuela França
  • Luis Martí-Bonmatí
  • Ángel Alberich-Bayarri
  • Pedro Oliveira
  • Susana Guimaraes
  • João Oliveira
  • João Amorim
  • Javier Sanchez Gonzalez
  • José Ramón Vizcaíno
  • Helena Pessegueiro Miranda
Article

Abstract

Purpose

The purpose of the study was to evaluate the role of intravoxel incoherent motion (IVIM) diffusion model for the assessment of liver fibrosis and inflammation in diffuse liver disorders, also considering the presence of liver steatosis and iron deposits.

Methods

Seventy-four patients were included, with liver biopsy and a 3 Tesla abdominal magnetic resonance imaging examination, with an IVIM diffusion-weighted sequence (single-shot spin-echo echo-planar sequence, with gradient reversal fat suppression; 6 b-values: 0, 50, 200, 400, 600, and 800 s/mm2). Histological evaluation comprised the Ishak modified scale, for grading inflammation and fibrosis, plus steatosis and iron loading classification. The liver apparent diffusion coefficient (ADC) and IVIM parameters (D, D*, f) were calculated from the IVIM images. The relationship between IVIM parameters and histopathological scores were evaluated by ANOVA and Spearman correlation tests. A test–retest experiment assessed reproducibility and repeatability in 10 healthy volunteers and 10 randomly selected patient studies.

Results

ADC and f values were lower with higher fibrosis stages (p = 0.009, p = 0.006, respectively) and also with higher necro-inflammatory activity grades (p = 0.02, p = 0.017, respectively). Considered together, only fibrosis presented a significant effect on ADC and f measurements (p < 0.05), whereas inflammation had no significant effect (p > 0.05). A mild correlation was found between ADC and f with fibrosis (R S = −0.32 and R S = −0.38; p < 0.05) and inflammation (R S = −0.31 and R S = −0.32, p < 0.05; respectively). The AUROC for ADC and f measurements with the different dichotomizations between fibrosis or inflammation grades were only fair (0.670 to 0.749, p < 0.05). Neither D nor D* values were significantly different between liver fibrosis or inflammation grades. D measurements were significantly different across histologic grades of steatosis (p < 0.001) and iron overload (p < 0.001), whereas f measurements showed significant differences across histologic steatosis grades (p = 0.005). There was an excellent agreement between the different readers for ADC, f, and D.

Conclusions

Although fibrosis presented a significant effect on ADC and f, IVIM measurements are not accurate enough to stage liver fibrosis or necro-inflammatory activity in diffuse liver diseases. D values were influenced by steatosis and iron overload.

Keywords

Magnetic resonance Diffusion-weighted imaging Intravoxel incoherent motion Liver fibrosis Liver steatosis Iron overload 

Notes

Acknowledgments

This work was partially funded by a research Grant from the Teaching and Research Department of Centro Hospitalar do Porto (DEFI:309/12(213-DEFI/251-CES)) and from a Spanish Ministry of Health and Carlos III Health Institute funding grant (PI12/01262). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Compliance with ethical standards

Conflicts of interest

Javier Sanchez Gonzalez is employee at Philips Healthcare Iberia. Angel Alberich Bayarri and Luis Martí-Bonmatí are co-founders of QUIBIM SME. The remaining authors declare that they have no conflicts of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed consent

Written informed consent was obtained from all patients.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Manuela França
    • 1
  • Luis Martí-Bonmatí
    • 2
  • Ángel Alberich-Bayarri
    • 2
  • Pedro Oliveira
    • 3
    • 4
  • Susana Guimaraes
    • 5
  • João Oliveira
    • 6
  • João Amorim
    • 6
  • Javier Sanchez Gonzalez
    • 7
  • José Ramón Vizcaíno
    • 8
  • Helena Pessegueiro Miranda
    • 4
    • 9
  1. 1.Imaging DepartmentCentro Hospitalar do PortoPortoPortugal
  2. 2.Radiology DepartmentHospital Universitario y Politécnico La Fe and Biomedical Imaging Research Group (GIBI230)ValenciaSpain
  3. 3.Population Studies Department, Institute of Biomedical Sciences Abel Salazar (ICBAS)University of PortoPortoPortugal
  4. 4.Epidemiology Research Unit (EPI Unit)Institute of Public Health of the University of PortoPortoPortugal
  5. 5.Pathology DepartmentCentro Hospitalar de S. JoãoPortoPortugal
  6. 6.Radiology DepartmentCentro Hospitalar do PortoPortoPortugal
  7. 7.MR Clinical SciencePhilips HealthcareMadridSpain
  8. 8.Pathology DepartmentCentro Hospitalar do PortoPortoPortugal
  9. 9.Liver and Pancreas Transplantation Unit and Medicine DepartmentCentro Hospitalar do PortoPortoPortugal

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