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. 2022 Feb;12(2):1450–1466. doi: 10.21037/qims-21-619

Figure 2.

Figure 2

Bland-Altman plots and linear regression analysis, showing the average on the logarithmic scale of the difference between SMI measured by CT and MRI. (A) Bland-Altman plot of lnCTSMI and by MRI T1-weighted (lnMRT1SMI) images. (B) Linear regression analysis of lnCTSMI and lnMRT1SMI images. (C) Bland-Altman plot of lnCTSMI and lnMRT2SMI images. (D) Linear regression analysis of lnCTSMI and by MRI T2-weighted images. The linear regression analysis (B,D) shows a clustering of points around the straight line, demonstrating that the MRI measurements of SMI are predictable starting from the CT measurements. The central line of the Bland-Altman plots represents the average difference between the two methods. In this analysis (A,C) most of the dots are equally distributed above and below the central line; moreover the measurements difference is more homogeneous comparing the MRI T1-weighted images to CT images than MRI T2 images to CT images. SMI, skeletal muscle index; CT, computed tomography; MRI, magnetic resonance imaging; lnCTSMI, the difference between SMI measured by CT; lnMRT1SMI, the difference between SMI by MRI T1-weighted; lnMRT2SMI, the difference between SMI by MRI T2-weighted.