Tissue Doppler Imaging (TDI)

Tissue Doppler Imaging (TDI): A quick clinical refresher

TDI uses PW Doppler to capture low-frequency, high-amplitude signals from myocardial tissue, allowing us to evaluate longitudinal LV shortening and lengthening with far greater precision than standard Doppler.

Spectral TDI:

- The S wave represents systolic motion toward the transducer (positive).

- The E′ and A′ waves reflect early and late diastolic motion away from the transducer (negative), capturing the biphasic pattern of LV lengthening.

Color TDI:

🔴Red indicates myocardial motion toward the probe during systole.

🔵 Blue indicates motion away from the probe during diastole.

TDI helps identify subtle systolic and diastolic abnormalities long before changes appear on conventional measurements such as ejection fraction.

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