tissue Doppler imaging
Also written as: TDI — Tissue Doppler Imaging
Ultrasound technique measuring myocardial tissue velocities to assess regional cardiac function and timing of mechanical events.
Full Definition
Tissue Doppler imaging (TDI) is a specialized echocardiographic technique that uses Doppler principles to measure the velocity of myocardial tissue movement rather than blood flow. TDI provides quantitative assessment of regional myocardial function by measuring systolic (S') and diastolic (E', A') tissue velocities at various myocardial locations. This technique offers superior temporal resolution compared to conventional echocardiography and can detect subtle abnormalities in regional function. TDI is particularly valuable for assessing diastolic function, identifying regional ischemia, and measuring mechanical synchrony. The technique can be performed using pulsed-wave, color-coded, or speckle-tracking approaches.
Usage
Usage note: Capitalize Doppler; specify measurement location and velocity direction when reporting values.
In Context
- "Tissue Doppler imaging showed reduced E' velocity of 6 cm/s at the septal annulus." — Diastolic function assessment
- "TDI revealed mechanical dyssynchrony with opposing wall motion patterns." — Cardiac resynchronization evaluation