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Eliminating the blood‐flow confounding effect in intravoxel incoherent motion (IVIM) using the non‐negative least square analysis in liver
Author(s) -
Gambarota Giulio,
Hitti Eric,
Leporq Benjamin,
SaintJalmes Hervé,
Beuf Olivier
Publication year - 2017
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.26085
Subject(s) - intravoxel incoherent motion , partial volume , perfusion , voxel , blood flow , nuclear magnetic resonance , blood volume , diffusion , nuclear medicine , chemistry , diffusion mri , magnetic resonance imaging , medicine , radiology , physics , cardiology , thermodynamics
Purpose Tissue perfusion measurements using intravoxel incoherent motion (IVIM) diffusion‐MRI are of interest for investigations of liver pathologies. A confounding factor in the perfusion quantification is the partial volume between liver tissue and large blood vessels. The aim of this study was to assess and correct for this partial volume effect in the estimation of the perfusion fraction. Methods MRI experiments were performed at 3 Tesla with a diffusion‐MRI sequence at 12 b‐values. Diffusion signal decays in liver were analyzed using the non‐negative least square (NNLS) method and the biexponential fitting approach. Results In some voxels, the NNLS analysis yielded a very fast‐decaying component that was assigned to partial volume with the blood flowing in large vessels. Partial volume correction was performed by biexponential curve fitting, where the first data point (b = 0 s/mm 2 ) was eliminated in voxels with a very fast‐decaying component. Biexponential fitting with partial volume correction yielded parametric maps with perfusion fraction values smaller than biexponential fitting without partial volume correction. Conclusion The results of the current study indicate that the NNLS analysis in combination with biexponential curve fitting allows to correct for partial volume effects originating from blood flow in IVIM perfusion fraction measurements. Magn Reson Med 77:310–317, 2017. © 2016 Wiley Periodicals, Inc.