High-resolution real-time three-dimensional acoustic imaging system with a reflector

Area of Science:

• Acoustic imaging
• Medical diagnostics
• Signal processing

Background:

• Traditional ultrasound systems face limitations in achieving high spatial and temporal resolutions simultaneously.
• Computational demands of real-time 3-D imaging often restrict system performance.

Purpose of the Study:

• To introduce a hybrid acoustic real-time three-dimensional (3-D) diagnostic imaging system.
• To achieve high time and spatial resolutions with a modest computational load using a novel array-reflector configuration.

Main Methods:

• Utilizing a small, dense array excited with time delays to transmit a broad beam.
• Employing a concave reflector to gather echoes received by the dense array.
• Reconstructing target images via numerical back projection from defocused array data.

Main Results:

• Reduced element count by approximately 8.2 times compared to dense 2-D digital beamforming systems for equivalent spatial resolution.
• Achieved sidelobe level suppression below -21 dB through element weighting.
• Demonstrated a maximum theoretical frame rate of 5000 3-D images/s.
• Exhibited a higher signal-to-noise ratio than defocused multi-element digital beamforming methods.

Conclusions:

• The proposed hybrid acoustic imaging scheme is suitable for applications demanding high time and spatial resolutions.
• Cardiology is identified as a key area benefiting from this advanced imaging technology.