High Frame Rate Ultrasonic Imaging System Based-on Linear Frequency-Modulated Signal

Area of Science:

• Ultrasound imaging
• Signal processing

Background:

• High frame rate (HFR) ultrasonic imaging systems utilize limited diffraction beams for rapid image construction.
• A key limitation of these systems is a reduced signal-to-noise ratio (SNR) due to single transmission per image.
• This lower SNR can compromise the quality of the generated ultrasound images.

Purpose of the Study:

• To improve the signal-to-noise ratio (SNR) in high frame rate (HFR) ultrasonic imaging.
• To enhance the image quality of HFR ultrasound systems through an advanced signal excitation method.

Main Methods:

• The study proposes using a linear frequency-modulated signal, also known as a chirp, as the excitation signal.
• The received signal is processed through a matched filter to achieve pulse compression.
• This method leverages the high time-bandwidth (TB) product characteristic of chirp signals.

Main Results:

• The proposed chirp excitation method significantly increases the SNR of the ultrasonic imaging system.
• The improved SNR directly translates to enhanced image quality compared to conventional methods.
• Matched filtering of the chirp signal effectively compresses the received data, improving signal detection.

Conclusions:

• Chirp signal excitation is an effective strategy for enhancing SNR in HFR ultrasonic imaging.
• The proposed method offers a viable solution to overcome the SNR limitations of current HFR systems.
• Improved image quality achieved through this technique has significant implications for diagnostic ultrasound applications.