A Novel 2-D Speckle Tracking Method for High-Frame-Rate Echocardiography

Area of Science:

• Cardiology
• Medical Imaging
• Biomedical Engineering

Background:

• Speckle tracking echocardiography (STE) assesses regional myocardial function noninvasively.
• High-frame-rate (HFR) imaging can improve STE time resolution.
• Dedicated HFR STE algorithms are needed for detecting subtle interframe motions.

Purpose of the Study:

• To introduce a novel 2-D STE method specifically designed for HFR echocardiography.
• To enhance the accuracy of regional motion and deformation quantification in cardiac imaging.

Main Methods:

• Developed a two-step, 1-D cross-correlation-based 2-D motion estimator for axial and lateral displacement.
• Optimized and validated the algorithm using simulated data.
• Tested the method in vivo on ten healthy volunteers.

Main Results:

• Achieved ~3.3% accuracy for axial and ~10.5% for lateral displacement estimates on simulated data.
• Demonstrated clinical applicability and feasibility in vivo.
• Obtained clinical markers comparable to literature values and showed good correlation with clinical scanners for peak global longitudinal strain.

Conclusions:

• A novel algorithm for HFR STE was developed, utilizing RF signals for axial and envelope data for lateral motion estimation.
• The use of 2-D kernels in 1-D cross-correlation enhances noise sensitivity.
• The method shows promise for improved noninvasive assessment of regional myocardial function.