研究目的
Investigating the first toroidally focused 2D real-time laser-ultrasonic imaging system and a modified filtered back projection algorithm for improved imaging near the waist of the astigmatic laser-ultrasonic probe beam.
研究成果
The developed toroidally focused LU imaging system allowed visualization of a sample located at ~4 cm depth in water with the lateral spatial resolution of 0.32 mm and axial spatial resolution of 30 μm in real time. The achieved frame rate was up to 30 Hz. The high sensitivity is achieved between the foci of the array.
研究不足
The manufacture of the toroidally focused imaging system is more difficult than the manufacture of the cylindrically focused system. The sensitivity region of the toroidal array is much smaller than that of the cylindrical array.
1：Experimental Design and Method Selection:
The study utilized a toroidally focused 2D real-time laser-ultrasonic imaging system with a modified filtered back projection algorithm.
2：Sample Selection and Data Sources:
An acupuncture needle
3：2 mm in diameter located at ~4 cm depth in water was used as a model for a point-like acoustic scatterer. List of Experimental Equipment and Materials:
A Q-switched laser, fiberoptic cable, PA generator, toroidal PMMA acoustic lens, 16 wideband piezoelectric PVDF transducers, and a high-speed 32-channel data acquisition and processing system based on NI FlexRIO architecture.
4：Experimental Procedures and Operational Workflow:
The laser radiation was delivered to the PA generator, generating an acoustic pulse that underwent scattering by the object. The back-scattered acoustic waves were registered by the transducers, digitized, and processed in real-time.
5：Data Analysis Methods:
The LU image was reconstructed using the FBP algorithm modified for toroidally focused arrays, accelerated on a GPU using NVIDIA CUDA computing platform.
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Q-switched laser
TECH-1053
Laser-Compact, Russia
Generating laser radiation for the PA generator
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Fiberoptic cable
Optofiber, Russia
Delivering laser radiation to the PA generator
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PA generator
Absorbing laser radiation and generating acoustic pulses
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Toroidal PMMA acoustic lens
Focusing the acoustic pulse
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Piezoelectric PVDF transducers
Registering back-scattered acoustic waves
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High-speed 32-channel data acquisition and processing system
NI FlexRIO
National Instruments, USA
Digitizing, storing, averaging the acquired data
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Personal computer
Intel? Core? i7-4770 CPU @ 3.4GHz
Intel, USA
Processing and reconstructing the LU image
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GPU
NVIDIA GeForce GTX 770
NVIDIA, USA
Accelerating the FBP algorithm
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