%0 Journal Article
%T Removal of evidential motion
%A Jian He
%A Nan Zhou
%A Olivier Chevallier
%A Romaric Loffroy
%A Y¨¬ Xi¨¢ng J W¨¢ng
%J Acta Radiologica
%@ 1600-0455
%D 2018
%R 10.1177/0284185118756949
%X It has been reported that intravoxel incoherent motion (IVIM) diffusion magnetic resonance imaging (MRI) scan¨Crescan reproducibility is unsatisfactory. To study IVIM MRI parameter reproducibility for liver parenchyma after the removal of motion-contaminated and/or poorly fitted image data. Eighteen healthy volunteers had liver scans twice in the same session to assess scan¨Crescan 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¨C800 s/mm2). 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. 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¨C10 slices per examination (mean£¿=£¿5.3 slices, median£¿=£¿5 slices) were utilized for analysis. Using threshold b-value£¿=£¿80£¿s/mm2, the coefficient of variation and within-subject coefficient of variation for repeatability were 2.86% and 3.36% for Dslow, 3.81% and 4.24% for perfusion fraction (PF), 18.16% and 24.88% for Dfast; and those for reproducibility were 2.48% and 3.24% for Dslow, 4.91% and 5.38% for PF, and 21.18% and 30.89% for Dfast. Removal of motion-contaminated and/or poorly fitted image data improves IVIM parameter reproducibility
%K Diffusion-weighted imaging
%K intravoxel incoherent motion
%K liver
%K reproducibility
%U https://journals.sagepub.com/doi/full/10.1177/0284185118756949