Fig. 4. Bland-Altman plots for assessment of agreement of fat-signal fraction (FF) between MR spectroscopy (MRS) and mapping image measurements. Bland-Altman.

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Fig. 4. Bland-Altman plots for assessment of agreement of fat-signal fraction (FF) between MR spectroscopy (MRS) and mapping image measurements. Bland-Altman plot shows mean measurement bias with limits of agreement of FFs, obtained from FF maps using non-T2*-corrected two-echo volume interpolated breath-hold gradient-echo (VIBE-Dixon) sequence (Observer A, A-1; Observer B, B-1), T2*-corrected three-echo VIBE-Dixon sequence (Observer A, A-2; Observer B, B-2), and T2*-corrected six-echo VIBE-Dixon sequence (Observer A, A-3; Observer B, B-3) in relation to FFs measured with MRS. Narrow range of limits of agreement was seen in T2*-corrected six-echo VIBE-Dixon as compared with other sequences in each observer. FF % two-echo = FF obtained from non-T2*-corrected two-echo VIBE-Dixon sequence, FF % three-echo = FF obtained from T2*-corrected three-echo VIBE-Dixon sequence, FF % six-echo = FF obtained from T2*-corrected six-echo VIBE-Dixon sequence, FF % MRS = FF obtained from MR spectroscopy, SD = standard deviation Fig. 4. Bland-Altman plots for assessment of agreement of fat-signal fraction (FF) between MR spectroscopy (MRS) and mapping image measurements. Bland-Altman plot shows mean measurement bias with limits of agreement of FFs, obtained from FF maps using non-T2*-corrected two-echo volume interpolated breath-hold gradient-echo (VIBE-Dixon) sequence (Observer A, A-1 . . . Korean J Radiol. 2015 Sep-Oct;16(5):1086-1095. http://dx.doi.org/10.3348/kjr.2015.16.5.1086