Published in:
01-02-2016 | Research Article
DCE-MRI of hepatocellular carcinoma: perfusion quantification with Tofts model versus shutter-speed model—initial experience
Authors:
Guido H. Jajamovich, Wei Huang, Cecilia Besa, Xin Li, Aneela Afzal, Hadrien A. Dyvorne, Bachir Taouli
Published in:
Magnetic Resonance Materials in Physics, Biology and Medicine
|
Issue 1/2016
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Abstract
Objective
To quantify hepatocellular carcinoma (HCC) perfusion and flow with the fast exchange regime-allowed Shutter-Speed model (SSM) compared to the Tofts model (TM).
Materials and methods
In this prospective study, 25 patients with HCC underwent DCE-MRI. ROIs were placed in liver parenchyma, portal vein, aorta and HCC lesions. Signal intensities were analyzed employing dual-input TM and SSM models. ART (arterial fraction), K
trans (contrast agent transfer rate constant from plasma to extravascular extracellular space), v
e
(extravascular extracellular volume fraction), k
ep (contrast agent intravasation rate constant), and τ
i
(mean intracellular water molecule lifetime) were compared between liver parenchyma and HCC, and ART, K
trans, v
e
and k
ep were compared between models using Wilcoxon tests and limits of agreement. Test–retest reproducibility was assessed in 10 patients.
Results
ART and v
e
obtained with TM; ART, v
e
, k
e and τ
i
obtained with SSM were significantly different between liver parenchyma and HCC (p < 0.04). Parameters showed variable reproducibility (CV range 14.7–66.5 % for both models). Liver K
trans and v
e
; HCC v
e
and k
ep were significantly different when estimated with the two models (p < 0.03).
Conclusion
Our results show differences when computed between the TM and the SSM. However, these differences are smaller than parameter reproducibilities and may be of limited clinical significance.