Journal
PHOTOACOUSTICS
Volume 17, Issue -, Pages -Publisher
ELSEVIER GMBH
DOI: 10.1016/j.pacs.2019.100160
Keywords
Laser ultrasound; Laser ultrasound imaging; Tomography; Real-time; Back projection; Toroidal array; Focused array
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Funding
- NUST MISIS Competitiveness Program by the Ministry of Science and Higher Education of the Russian Federation [K2-2019-004]
- Russian Federation State assignment of FSRC Crystallography and Photonics RAS
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In this paper we report on the first toroidally focused 2D real-time laser-ultrasonic imaging system and a modified filtered back projection algorithm that can be used in the region near the waist of the astigmatic laser-ultrasonic probe beam. The system is capable of visualizing an acupuncture needle 0.2 mm in diameter located at similar to 4 cm depth in water. The lateral spatial resolution is better than similar to 0.32 mm and axial spatial resolution is similar to 30 mu m. The achieved frame rate is up to 30 Hz. The depth dependency of the sensitivity region width and lateral resolution are experimentally measured and discussed. The array is intended to be used as a part of combined real-time photoacoustic and laser-ultrasonic imaging system.
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