Two-dimensional localization with a single diffuse ultrasound field excitation

Area of Science:

• Ultrasound imaging
• Acoustic microscopy
• Non-destructive testing

Background:

• Traditional ultrasound imaging relies on specific bandwidth and center frequency for resolution.
• Existing methods often involve complex scanning techniques.

Purpose of the Study:

• To present a new modality for spatially localizing scattering targets in 2D.
• To simplify traditional scanning techniques in ultrasound imaging.

Main Methods:

• Utilizing high bandwidth and low center frequency excitation.
• Employing single send-receive sequences for full 2D field measurements.
• Reconstructing field data using temporal-spectral cross-correlations with a priori measurements.
• Developing a wedge-shaped transducer geometry for frequency separation.

Main Results:

• Achieved spatially frequency-separated bandwidths up to 156% with a 1.38 MHz center frequency.
• Demonstrated 2D target localization within 0.5 mm for cylindrical targets in a 10-mm x 10-mm region of interest (ROI).
• Successfully localized single and multiple point scatterers.

Conclusions:

• The new modality offers simplified scanning and precise 2D spatial localization of targets.
• The wedge-shaped transducer design enhances frequency separation for improved imaging.
• This method shows potential for advanced ultrasound applications requiring accurate target identification.