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Figure 3 Correlation between magnetic resonance imaging (MRI) and tissue Doppler images (TDI) for assessment of left ventricular (LV) dyssynchrony. (A) The extent of LV dyssynchrony measured with MRI is plotted against LV dyssynchrony measured with TDI for both patients and normal individuals. For seven normal individuals and two patients, no dyssynchrony was noted on either TDI or MRI, showing coinciding markers in (0,0). Linear regression for all data resulted in a strong linear relation between MRI and TDI (Y = 0.99X – 4.9, n = 30, r = 0.98, p < 0.01). The differences between MRI and TDI (Bland-Altman analysis) are presented in (B). The MRI showed a small nonsignificant underestimation of 5 ± 8 ms for LV dyssynchrony as compared with TDI (dashed lines). The confidence intervals ranged from –22 ms to 11 ms (dotted lines).
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