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Intra-voxel incoherent motion MRI in rodent model of diethylnitrosamine-induced liver fibrosis. Magn Reson Imaging 2013 Jul;31(6):1017-21

Date

04/20/2013

Pubmed ID

23598061

Pubmed Central ID

PMC3676695

DOI

10.1016/j.mri.2013.03.007

Scopus ID

2-s2.0-84878663123   23 Citations

Abstract

RATIONALE AND OBJECTIVES: To compare the apparent diffusion coefficient (ADC) and the perfusion fraction measured by intra-voxel incoherent motion (IVIM) Magnetic Resonance Imaging (MRI) with liver fibrosis degrees in a rodent model.

MATERIALS AND METHODS: All experiments received approval from our institutional animal care and use committee. Liver fibrosis was induced in 13 rats by oral gavage with diethylnitrosamine; 4 untreated rats with normal livers were used as controls. Diffusion Weighted MRI was performed and 8 gradient factors (0, 50, 100, 150, 200, 300, 400 and 500s/mm(2)) were acquired. The values of ADC, true diffusion coefficient D and perfusion fraction f were measured based on Li Bihan's method. The percentage of liver fibrosis was assessed via quantitative analysis of Masson trichrome staining using an average of 30 fields per section. The MRI measurements were compared to the histological fibrotic grade to evaluate the correlation between them.

RESULTS: ADC contained the contribution of diffusion and perfusion. The ADC and f values decreased significantly with the increasing fibrosis level (correlation coefficient: ADC: ρ=-0.781, p<0.001; f: ρ=-0.720, p=0.001); but D was poorly correlated with fibrosis level (ρ=-0.502, p=0.040).

CONCLUSION: The hepatic ADC and the perfusion fraction f were significantly correlated with the liver fibrosis level; however, D was not. This might suggest that hepatic perfusion is altered during the progression of hepatic fibrosis.

Author List

Zhang Y, Jin N, Deng J, Guo Y, White SB, Yang GY, Omary RA, Larson AC

Author

Sarah B. White MD, MS, FSIR, FCIRSE Vice Chair, Professor in the Radiology department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Animals
Artifacts
Diethylnitrosamine
Disease Models, Animal
Humans
Image Enhancement
Image Interpretation, Computer-Assisted
Liver Cirrhosis
Magnetic Resonance Imaging
Male
Movement
Rats
Rats, Wistar
Reproducibility of Results
Sensitivity and Specificity