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Table 1 r2 values and time-delays for the cross-correlations between the 2D and the 3D torsion calculation method.

From: Comparison of 2D and 3D calculation of left ventricular torsion as circumferential-longitudinal shear angle using cardiovascular magnetic resonance tagging

 

r2 (T2D)

r2 (T*2D)

Time delay (time lags) (T2D, T*2D)

Base-apex

0.99 ± 0.01

0.98 ± 0.02

0.0 ± 0.0

Base-mid

0.97 ± 0.02

0.96 ± 0.03

0.0 ± 0.0

Mid-apex

0.95 ± 0.02

0.93 ± 0.06

0.0 ± 0.0

Average

0.97 ± 0.02

0.96 ± 0.04

0.0 ± 0.0

  1. One time-lag corresponds to 14 ms. A negative delay would indicate that the 3D method was delayed with respect to the 2D method. Values are mean ± SD.