Tissue Doppler Imaging/Tissue Velocity Imaging
©Walter Rasmussen, R.D.C.S.
Tissue Doppler Imaging (TDI) or Tissue Velocity Imaging (TVI) is ultrasonic tracking of myocardial movement using pulsed Doppler. Most ultrasound machines provide a preset which automatically optimizes the machine scale and filtering for this mode.
TVI (Tissue Velocity Imaging) button on the GE Vivid product, initiates the Doppler tissue imaging software.
The brightly-colored display demonstrates a moving two-dimensional image with diastolic movement in red hues and systolic movement in blue hues. There is typically noise in the background, resulting in areas that are of no diagnostic value.
Once the apical four chamber view is composed and TDI is activated, a PW Doppler cursor is placed at the lateral mitral annulus and PW Doppler initiated. The medial mitral annulus is also recorded as part of the standard protocol.
Above: GE TVI
Tissue Doppler Imaging was used clinically and in research to a much greater degree when it was first introduced than it is today. TDI has largely been replaced by Speckle Tracking because it does not have the angle limitations.
M-Mode of the septal wall during TVI mode is a method for detailed analysis of myocardial motion duration from apex to base. The lateral wall can be similarly imaged.
Tissue Doppler Imaging and Speckle Tracking are used for what is called, “Strain Rate Imaging”. Strain Rate Imaging attempts to quantify the contractity of myocardial fibers (often referred to as, “Deformation”). Since this website is primarily about imaging techniques, please refer to Wikipedia and other sites for more information about the analysis of Strain Rate Imaging.