Phase aberration correction using ultrasound radiation force and vibrometry optimization

Area of Science:

• Medical Imaging
• Acoustic Physics
• Biomedical Engineering

Background:

• Ultrasound imaging quality is often degraded by phase aberrations.
• Accurate focusing is crucial for achieving high-resolution ultrasound images.
• Existing aberration correction methods can be complex and time-consuming.

Purpose of the Study:

• To develop and validate a new method for phase aberration correction in ultrasound.
• To utilize dynamic ultrasound radiation force for optimizing beam focus.
• To demonstrate the recovery of ultrasound resolution post-aberration.

Main Methods:

• Employing amplitude modulated continuous wave ultrasound to induce harmonic vibration via radiation force.
• Adjusting the phase of an annular array transducer elements to maximize radiation force.
• Monitoring scatterer velocity in the focal region to guide optimization.
• Utilizing Doppler laser vibrometer and pulse-echo Doppler ultrasound for velocity measurements.

Main Results:

• Theoretical framework demonstrating a well-behaved cost function for focal optimization.
• Experimental correction of manually induced defocusing of an annular array.
• Successful correction of phase aberrations caused by a lens-shaped aberrator.
• Demonstrated recovery of ultrasound beam resolution through radiation force maximization.

Conclusions:

• Dynamic ultrasound radiation force provides an effective mechanism for phase aberration correction.
• This method enables real-time optimization of ultrasound beam focusing.
• The technique shows promise for improving image quality in various ultrasound applications.