Probe Oscillation Shear Elastography (PROSE): A High Frame-Rate Method for Two-Dimensional Ultrasound Shear Wave...

Area of Science:

• Medical Imaging
• Biophysics
• Ultrasound Technology

Background:

• Ultrasound shear wave elastography (SWE) characterizes soft tissue elasticity using shear wave propagation.
• Acoustic radiation force (ARF) methods require specialized hardware and are limited to ~1 Hz frame rates due to thermal constraints.
• Current ARF limitations restrict its use to high-end clinical systems.

Purpose of the Study:

• To introduce Probe Oscillation Shear Elastography (PROSE) as an alternative to ARF-based SWE.
• To demonstrate PROSE's capability for high frame rate, 2D shear wave imaging.
• To validate PROSE's accuracy and resolution in phantom studies.

Main Methods:

• PROSE generates shear waves via transducer harmonic mechanical vibration.
• Simultaneous pulse-echo detection with a novel symmetric sampling scheme decouples shear waves from compression artifacts.
• Local frequency estimation (LFE) generates full field-of-view (FOV) 2D shear wave speed images from single frames.

Main Results:

• PROSE achieved effective frame rates of 300 Hz, an order of magnitude higher than ARF techniques.
• Smooth and accurate 2D shear wave images were obtained from homogeneous phantoms.
• Inclusion imaging demonstrated improved accuracy with increased vibration frequencies, resolving 6.5 mm targets with high contrast (≥ 19 dB).

Conclusions:

• PROSE provides a viable, hardware-efficient alternative for high frame rate ultrasound shear wave elastography.
• The method accurately quantifies tissue elasticity and visualizes inclusions with high resolution and contrast.
• PROSE has the potential to broaden the clinical accessibility of SWE.