Author + information
Quantitative analysis of strain in cardiac imaging is crucial in treatment of cardiac disorders. Thus far, cardiac motion detection is based on tissue Doppler imaging (TDI) or speckle tracking echocardiography (STE). These techniques are based on two independent methods; Doppler effect and image processing. Doppler techniques are angle dependent and cannot provide 2-dimensional (2D) displacements. STE is 2D but suffers from the noisy structure of B-mode images.
In order to increase the performance of the speckle tracking technique, a combined novel approach (fusion method) was developed. The proposed approach is based on the fusion of B-mode data and projected Doppler data in the direction of the ultrasound beam using linear algebra.
The relative motion detection error was 1.58 ± 0.86 mm for the fusion method compared to the manual tracking. Cardiac longitudinal strain values derived from the fusion method were compared to the strain values derived from STE. The mean absolute difference of motion using the fusion method with respect to STE was 42.7% ± 13.8. Correlation value of the longitudinal strain derived from the fusion method was r=0.76 (p<0.001) compared to the STE. Figure 1(a) shows the strain curves for different long-axis cardiac segments using iE 33 STE and Figure 1(b) shows the strain curves using the fusion technique.
Fusion of speckle tracking and tissue Doppler in echocardiography is feasible and can lead to more accurate analysis of the motion.
Poster Sessions, Expo North
Monday, March 11, 2013, 9:45 a.m.-10:30 a.m.
Session Title: Imaging: CRT/New Technology
Abstract Category: 18. Imaging: Echo
Presentation Number: 1312-340
- 2013 American College of Cardiology Foundation