Key result
The tissue Doppler imaging (TDI) system accurately represents tissue velocity and creates real-time two-dimensional images of ventricular wall motion, facilitating visual assessment.
Why the study?
Does the tissue Doppler imaging (TDI) system accurately measure and represent ventricular wall motion velocity?
Does the tissue Doppler imaging (TDI) system accurately measure and represent ventricular wall motion velocity?
The development of the tissue Doppler imaging system allows for accurate, real-time two-dimensional visual assessment of ventricular wall motion velocities.
Answers are grounded in this paper and cite their sources.
Provides preclinical proof-of-concept for real-time TDI wall motion imaging; leaves open human validation and clinical adoption.
We developed a new color Doppler system by which Doppler signals associated with tissue motion can be determined, and called it the tissue Doppler imaging (TDI) system. Using high-speed scanning, the frame rate was 26–38 F/s, and the pulse repetition frequency was 4.5–6.0 kHz. Under these conditions, the lowest measurable velocity was improved to 2 mm/s. Wall motion toward the transducer was coded as red, and that away from the transducer, as blue. To examine the accuracy and validity of the measured velocity of ventricular wall motion, we performed in vitro and in vivo studies. The results demonstrate that the present TDI system accurately represents the tissue velocity, and is applicable for creating two-dimensional images of the ventricular wall motion in real time, facilitating the visual assessment of abnormal ventricular wall motion.
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Yamazaki et al. (1994) studied Abnormal ventricular wall motion. Tissue Doppler imaging (TDI) system was evaluated on Accuracy and validity of the measured velocity of ventricular wall motion. The tissue Doppler imaging (TDI) system accurately represents tissue velocity and creates real-time two-dimensional images of ventricular wall motion, facilitating visual assessment.
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