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Removal of evidential motion-contaminated and poorly fitted image data improves IVIM diffusion MRI parameter scan–rescan reproducibility

Abstract : Background: It has been reported that intravoxel incoherent motion (IVIM) diffusion magnetic resonance imaging (MRI) scan-rescan reproducibility is unsatisfactory. Purpose: To study IVIM MRI parameter reproducibility for liver parenchyma after the removal of motion-contaminated and/or poorly fitted image data. Material and Methods: Eighteen healthy volunteers had liver scans twice in the same session to assess scan-rescan repeatability, and again in another session after an average interval of 13 days to assess reproducibility. Diffusion-weighted images were acquired with a 3-T scanner using respiratory-triggered echo-planar sequence and 16 b-values (0-800 s/mm(2)). Measurement was performed on the right liver with segment-unconstrained least square fitting. Image series with evidential anatomical mismatch, apparent artifacts, and poorly fitted signal intensity vs. b-value curve were excluded. A minimum of three slices was deemed necessary for IVIM parameter estimation. Results: With a total 54 examinations, six did not satisfy inclusion criteria, leading to a success rate of 89%, and 14 volunteers were finally included for the repeatability/reproducibility study. A total of 3-10 slices per examination ( mean = 5.3 slices, median = 5 slices) were utilized for analysis. Using threshold b-value = 80 s/mm(2), the coefficient of variation and within-subject coefficient of variation for repeatability were 2.86% and 3.36% for D-slow, 3.81% and 4.24% for perfusion fraction (PF), 18.16% and 24.88% for D-fast; and those for reproducibility were 2.48% and 3.24% for D-slow, 4.91% and 5.38% for PF, and 21.18% and 30.89% for D-fast. Conclusion : Removal of motion-contaminated and/or poorly fitted image data improves IVIM parameter reproducibility.
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https://hal-univ-bourgogne.archives-ouvertes.fr/hal-01926942
Contributeur : Le2i - Université de Bourgogne <>
Soumis le : lundi 19 novembre 2018 - 15:14:51
Dernière modification le : lundi 19 novembre 2018 - 16:38:42

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Olivier Chevallier, Nan Zhou, Jian He, Romaric Loffroy, Yì Xiáng J Wáng. Removal of evidential motion-contaminated and poorly fitted image data improves IVIM diffusion MRI parameter scan–rescan reproducibility. Acta Radiologica, SAGE Publications, 2018, 59 (10), pp.1157 - 1167. ⟨10.1177/0284185118756949⟩. ⟨hal-01926942⟩

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