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27 April 2016 High speed intravascular photoacoustic imaging of atherosclerotic arteries (Conference Presentation)
Zhonglie Piao, Teng Ma, Yueqiao Qu, Jiawen Li, Mingyue Yu, Youmin He, K. Kirk Shung, Qifa Zhou, Chang-Seok Kim, Zhongping Chen
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Proceedings Volume 9689, Photonic Therapeutics and Diagnostics XII; 968930 (2016) https://doi.org/10.1117/12.2214068
Event: SPIE BiOS, 2016, San Francisco, California, United States
Abstract
Cardiovascular disease is the leading cause of death in the industrialized nations. Accurate quantification of both the morphology and composition of lipid-rich vulnerable atherosclerotic plaque are essential for early detection and optimal treatment in clinics. In previous works, intravascular photoacoustic (IVPA) imaging for detection of lipid-rich plaque within coronary artery walls has been demonstrated in ex vivo, but the imaging speed is still limited. In order to increase the imaging speed, a high repetition rate laser is needed. In this work, we present a high speed integrated IVPA/US imaging system with a 500 Hz optical parametric oscillator laser at 1725 nm. A miniature catheter with 1.0 mm outer diameter was designed with a 200 μm multimode fiber and an ultrasound transducer with 45 MHz center frequency. The fiber was polished at 38 degree and enclosed in a glass capillary for total internal reflection. An optical/electrical rotary junction and pull-back mechanism was applied for rotating and linearly scanning the catheter to obtain three-dimensional imaging. Atherosclerotic rabbit abdominal aorta was imaged as two frame/second at 1725 nm. Furthermore, by wide tuning range of the laser wavelength from 1680 nm to 1770 nm, spectroscopic photoacoustic analysis of lipid-mimicking phantom and an human atherosclerotic artery was performed ex vivo. The results demonstrated that the developed IVPA/US imaging system is capable for high speed intravascular imaging for plaque detection.
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Zhonglie Piao, Teng Ma, Yueqiao Qu, Jiawen Li, Mingyue Yu, Youmin He, K. Kirk Shung, Qifa Zhou, Chang-Seok Kim, and Zhongping Chen "High speed intravascular photoacoustic imaging of atherosclerotic arteries (Conference Presentation)", Proc. SPIE 9689, Photonic Therapeutics and Diagnostics XII, 968930 (27 April 2016); https://doi.org/10.1117/12.2214068
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KEYWORDS
Arteries
Imaging systems
Photoacoustic imaging
Photoacoustic spectroscopy
Medical laser equipment
Laser optics
Multimode fibers
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