Dynamic Transmit-Receive Beamforming by Spatial Matched Filtering for Ultrasound Imaging with Plane Wave...

Area of Science:

• Medical Imaging
• Ultrasound Technology
• Signal Processing

Background:

• Conventional ultrasound imaging is limited by low frame rates due to multiple transmissions and time-of-flight constraints.
• High frame rate imaging is achievable with plane wave transmissions (PWT) and parallel receive processing, but lacks transmit focusing, degrading image quality.

Purpose of the Study:

• To combine spatial matched filtering (SMF) beamforming with PWT to achieve high frame rate ultrasound imaging with dynamic transmit-receive focusing.
• To evaluate the performance of the PWT + SMF method in terms of lateral resolution and contrast.

Main Methods:

• Applied SMF beamforming to PWT for simultaneous dynamic focusing and high frame rate acquisition.
• Utilized narrowband Rayleigh-Sommerfeld diffraction theory for mathematical demonstration of two-way focusing.
• Quantified broadband performance using computer simulations and experimental data, comparing PWT + SMF with conventional delay-and-sum (DAS) beamforming.

Main Results:

• PWT + SMF demonstrated mathematical capability for two-way focusing.
• Simulations showed a 29% lateral resolution and 160% contrast improvement at 40 mm depth.
• Experimental data revealed 17% lateral resolution and 48% contrast improvements with PWT + SMF, even with noise.

Conclusions:

• The combination of PWT and SMF beamforming enables high frame rate ultrasound imaging with superior transmit-receive focusing.
• PWT + SMF offers significant improvements in lateral resolution and contrast over conventional DAS beamforming.
• This advanced method holds promise for enhanced diagnostic capabilities in ultrasound applications.