Fast Volumetric Imaging Using a Matrix Transesophageal Echocardiography Probe with Partitioned Transmit-Receive Array

Area of Science:

• Medical Imaging
• Ultrasound Technology
• Cardiovascular Imaging

Background:

• Real-time 3-D ultrasound imaging is crucial for cardiovascular diagnostics.
• Current volumetric ultrasound systems face limitations in speed and image quality.

Purpose of the Study:

• To develop and validate a 3-D multiline parallel beamforming scheme for enhanced real-time volumetric ultrasound imaging.
• To improve frame rates and image quality in transesophageal echocardiography.

Main Methods:

• Utilized a prototype matrix transesophageal echocardiography probe with diagonally diced elements and separated transmit/receive arrays.
• Implemented micro-beamforming in an application-specific integrated circuit for receive aperture sub-arrays.
• Developed a beamforming sequence with 85 transmit-receive events for a 60°×60° volume sector.

Main Results:

• Achieved volume rates up to 59 Hz, with in vivo imaging at 22 Hz.
• Produced high-quality 3-D images through angle-weighted combination of overlapping sub-volumes.
• Validated performance using simulations, phantom measurements, and in vivo imaging, showing close matches in image quality metrics.

Conclusions:

• The proposed 3-D parallel beamforming scheme enables high-volume-rate, real-time 3-D ultrasound imaging.
• Demonstrated effective visualization of cardiac structures and valve motion in vivo.
• This technique offers significant potential for advanced cardiovascular diagnostics.