Real-time chirp-coded imaging with a programmable ultrasound biomicroscope

Area of Science:

• Biomedical Imaging
• Ultrasound Technology
• Animal Models

Background:

• Ultrasound biomicroscopy (UBM) is crucial for preclinical research, particularly in small animal models like mice.
• Developing advanced UBM systems is essential for improving imaging resolution, signal-to-noise ratio (SNR), and imaging depth.

Purpose of the Study:

• To present a novel, programmable Ultrasound Biomicroscopy (UBM) system for mice research.
• To demonstrate the system's capability in implementing and evaluating advanced imaging sequences, specifically chirp sequences.
• To compare the performance of chirp imaging against conventional impulse imaging in terms of resolution, SNR, and imaging depth.

Main Methods:

• Development of a versatile UBM system with programmable design, broad bandwidth (2-80 MHz), and rapid scanning (
• Real-time implementation of chirp sequences (1.28, 2.56, 5.12 µs durations) with matched filter analysis.
• Comparison of chirp and impulse imaging (31, 46 MHz) using a wire phantom and in vivo mouse imaging.

Main Results:

• Chirp sequences achieved axial and lateral resolutions comparable to impulse imaging.
• Chirp imaging demonstrated a 10-15 dB gain in SNR and a 2-3 mm increase in imaging depth.
• Real-time in vivo imaging of mice using both impulse and chirp-coded sequences was successfully demonstrated.

Conclusions:

• The developed UBM system effectively supports the development and testing of new imaging strategies.
• Chirp-coded ultrasound imaging offers significant advantages in SNR and imaging depth over conventional methods.
• The system's open architecture facilitates the implementation and evaluation of novel ultrasound imaging sequences for preclinical research.