IVIM diffusion-weighted imaging of the liver at 3

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IVIM diffusion-weighted imaging of the liver at 3 IVIM diffusion-weighted imaging of the liver at 3.0T: Comparison with 1.5T Yong Cui, Hadrien Dyvorne, Cecilia Besa, Nancy Cooper, Bachir Taouli European Journal of Radiology Open Volume 2, Pages 123-128 (January 2015) DOI: 10.1016/j.ejro.2015.08.001 Copyright © 2015 The Authors Terms and Conditions

Fig. 1 43-year-old male patient with HCV. SS EPI diffusion-weighted images acquired at 1.5T and 3.0T. (A–C): 1.5T coronal DWI images [b=200 (A), 400 (B), 800 (C)]. (D–F): 3.0T axial DWI images [b=200 (D), 400 (E), 800 (F)]. (G): Coronal DWI image (b=200) reformatted from axial acquisition at 3.0T. (A) and (G) show ROI placement for signal intensity measurement. ROIs with the same size were placed within the right hepatic lobes as similar location as possible between scans. (H): Graph shows liver SI decay with 16 b values acquired at 1.5T (Δ) and 3.0T (■). For display purposes, data were normalized to b0 SI. Dashed (1.5T) and solid (3.0T) lines are biexponential model curves using Bayesian estimated IVIM parameters Calculated values were D (true diffusion coefficient)=1.19 and 0.96×10−3mm2/s, PF (perfusion fraction)=13.6% and 10.4% and D* (pseudo-diffusion coefficient)=82.3 and 41.9×10−3mm2/s at 1.5T and 3.0T, respectively. European Journal of Radiology Open 2015 2, 123-128DOI: (10.1016/j.ejro.2015.08.001) Copyright © 2015 The Authors Terms and Conditions

Fig. 2 Bland–Altman plots of percentage difference (y-axis) against mean (x-axis) of D (A), PF (B), D* (C) and ADC (D) measurements at the 1.5T and 3.0T, with mean percentage difference and upper and lower limits of agreement (also refer to Table 3). European Journal of Radiology Open 2015 2, 123-128DOI: (10.1016/j.ejro.2015.08.001) Copyright © 2015 The Authors Terms and Conditions

Fig. 3 66-year-old male patient with HCV and Metavir stage 1 fibrosis. Parametric IVIM diffusion maps of the abdomen at 1.5T (Coronal, A–D) and 3.0T (axial, E–H). A, E: SS EPI diffusion image (b200). (B and F): D map (true diffusion coefficient, mm2/s). (C and G): PF map (perfusion fraction, %). (D and H): D* map (pseudodiffusion coefficient mm2/s). D maps show slightly higher values at the 1.5T than the 3.0T. D* maps show higher values at the 1.5T compared to the 3.0T. PF maps show lower values at the 1.5T compared to the 3.0T. Calculated values were as follows: for D, 0.97 and 0.94×10−3mm2/s at the 1.5T and the 3.0T, respectively; for PF, 18.9% and 27.7%, respectively; for D*, 82.9 and 60.3×10−3mm2/s, respectively. European Journal of Radiology Open 2015 2, 123-128DOI: (10.1016/j.ejro.2015.08.001) Copyright © 2015 The Authors Terms and Conditions