Quantitative assessment of portal hypertension with bi-parametric dual-frequency hepatic MR elastography in mouse models

Jiahui Li, Tejasav S. Sehrawat, Jingbiao Chen, Moira B. Hilscher, Kevin J. Glaser, Juan P. Arab, Thiago Milech De Assuncao, Douglas A. Simonetto, Taofic Mounajjed, Armando Manduca, Richard L. Ehman, Vijay H. Shah, Meng Yin

Research output: Contribution to journalArticlepeer-review

Abstract

Objectives: To determine the potential of bi-parametric dual-frequency hepatic MR elastography (MRE) for predicting portal pressure (PP) in mouse models of portal hypertension (PHTN) with the presence of varying hepatic fibrosis. Methods: We studied 73 wild-type male mice, including 22 mice with hepatic congestion, 20 mice with cholestatic liver injury, and 31 age-matched sham mice. Hepatic shear stiffness (SS) and volumetric strain (VS) were calculated by 3D MRE acquired at 80 and 200 Hz. We measured PP immediately after MRE. Liver fibrosis was verified by hydroxyproline assay. We predicted PP by fitting generalized linear models with single- and dual-frequency SS and VS, respectively. The relationship between predicted and actual PP was evaluated by Spearman’s correlation. We compared the prediction accuracy of portal hypertension for all models with DeLong tests at a significance level of 0.05. Results: Animals with congestive or cholestatic liver disease developed significant PHTN and hepatic fibrosis to varying degrees. In both models, SS increased, while VS decreased significantly compared with shams. All bi-parametric models had high diagnostic accuracy for PHTN. The dual-frequency models (AUCs: 0.90 [81–95%], 0.91 [81–95%]) had substantially or significantly higher accuracy than single-frequency ones (AUCs: 0.83 [71–91%], and 0.78 [66–87%]). The predicted PP of dual-frequency models also showed stronger correlations with actual PP than single-frequency predictions. Conclusions: The bi-parametric dual-frequency model improved the diagnostic accuracy of liver MRE in diagnosing PHTN in preclinical models. This technical advance has the potential to monitor PHTN progression and treatment efficacy in the presence of varying fibrosis. Key Points: • Bi-parametric hepatic MR elastography can predict portal pressure. • The prediction models of shear stiffness and volumetric strain with dual-frequency measurements demonstrate high diagnostic accuracy (AUCs > 0.9) in two different portal hypertension mouse models with varying fibrosis.

Original languageEnglish (US)
Pages (from-to)2303-2311
Number of pages9
JournalEuropean radiology
Volume31
Issue number4
DOIs
StatePublished - Apr 2021

Keywords

  • Cirrhosis
  • Congestion
  • Magnetic resonance elastography
  • Portal hypertension

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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