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Strain rate imaging using two-dimensional speckle tracking
K Kaluzynski1, X Chen, S Y Emelianov
1Institute for Precision and Biomedical Engineering, Warsaw University of Technology, 02-525 Warsaw, Poland.
Summary
New strain rate imaging (SRI) using 2D phase-sensitive speckle tracking accurately identifies non-contracting heart regions. This advanced ultrasound technique overcomes limitations of traditional methods, improving cardiac mechanics assessment.
Area of Science:
- Cardiovascular imaging
- Biomedical engineering
- Ultrasound technology
Background:
- Strain rate imaging (SRI) aids in identifying non-contracting myocardium.
- Traditional methods using Doppler-based tissue velocity signals have limitations.
- High frame rate cardiac imaging is crucial for accurate mechanical assessment.
Purpose of the Study:
- To propose and validate an alternate method for strain rate imaging (SRI).
- To utilize 2D phase-sensitive speckle tracking for high-resolution strain magnitude derivative maps.
- To compare the proposed SRI method with traditional tissue velocity imaging (TVI).
Main Methods:
- Developed a 2D phase-sensitive speckle tracking algorithm for real-time ultrasound.
- Captured very high frame rate ultrasound images of a cardiac phantom.
- Simulated and measured strain rate images (SRI) using the developed method and compared with TVI.
Main Results:
- Simulations demonstrated SRI spatial resolution of 1-2 mm at 5 MHz.
- The proposed SRI method is virtually free of angle-dependent artifacts.
- Identified low deformation regions in phantom models that were obscured by TVI-based SRI.
Conclusions:
- 2D phase-sensitive speckle tracking offers a superior method for generating strain rate images.
- This technique provides a more complete description of cardiac mechanics.
- The method effectively visualizes subtle regional myocardial dysfunction.
