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Left ventricular function
Tissue Velocity Imaging
Tissue Velocity Imaging (TVI) uses myocardial Doppler frequency shifts to quantify myocardial tissue motion. TVI can be used to assess global and regional systolic function, as well as left ventricle relaxation abnormalities. The advantage of TVI is that it is based on the Doppler-shifted part of the reflected signal. This gives the clinician a tool to assess myocardial function, even though the two-dimensional image quality may be suboptimal. Just as with conventional Doppler, TVI can be displayed as pulsed Doppler (Figure 1), color Doppler (Figure 2) and color M-Mode (Figure 3).
GE allows access to raw data, which gives you the ability to quantify TVI live or at a future time by simply storing a 2D color TVI image. You can then go into Q-Analysis and acquire TVI waveforms (Figure 4). You can also convert the TVI information from the raw data to display Tissue Tracking, Tissue Synchronization Imaging, Strain or Strain Rate Imaging.
Authors:
Sue Phillip, RCS
Andreas Heimdal, PhD