Feasibility of laparoscopic photoacoustic imaging system based on diffusing side-illumination fibers

Shang Gao; Matthew C. Flegal; Haichong K. Zhang

doi:10.1117/12.2613895

3 March 2022 Feasibility of laparoscopic photoacoustic imaging system based on diffusing side-illumination fibers

Shang Gao, Matthew C. Flegal, Haichong K. Zhang

Proceedings Volume 11960, Photons Plus Ultrasound: Imaging and Sensing 2022; 119601C (2022) https://doi.org/10.1117/12.2613895
Event: SPIE BiOS, 2022, San Francisco, California, United States

Abstract

Laparoscopic surgery is commonly used in the abdominal creating minimal trauma to the patient. With the current standard videoscope, visualizing vessels under the tissue is challenging. Photoacoustic (PA) imaging is laser-generated ultrasound imaging that offers vascular mapping. However, most in vivo PA imaging is limited by the lack of depth penetration due to the insufficient illumination in deep tissue caused by the light scattering and the risk of over-irradiation near laser contact tissue. Having a method to bring the signal sensing device closer to the target area is critical for the PA-guided intervention. A miniaturized PA laparoscopic should increase the maneuverability inside the abdominal for better visualization of the operational region. A PA imaging probe mainly consists of optical fibers and an ultrasound (US) transducer. While the US device miniaturization has been investigated, previous works used customized angled-tips fiber for side-illumination to miniaturize the light delivery, requiring multiple fibers or having limited illumination region. Diffusing fiber can illuminate a wider region with fewer fibers than angled-tip side-illumination fibers. This could further minimize the diameter of the entire PA laparoscopic by several millimeters. We propose a PA laparoscopic system imaging with only two diffusing side-illumination fibers while maintaining high image contrast. The phantom study shows the system can image 0.30 mm resolution with a 30 dB signal-to-noise ratio in an optical scattering environment. The result demonstrated the feasibility of delivering sufficient energy with diffusing fiber to miniaturize the dimensions of the PA laparoscopic device.

Citation Download Citation

Shang Gao, Matthew C. Flegal, and Haichong K. Zhang "Feasibility of laparoscopic photoacoustic imaging system based on diffusing side-illumination fibers", Proc. SPIE 11960, Photons Plus Ultrasound: Imaging and Sensing 2022, 119601C (3 March 2022); https://doi.org/10.1117/12.2613895

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KEYWORDS

Optical fibers

Laparoscopy

Imaging systems

Photoacoustic imaging

Signal to noise ratio

Tissues

Transducers

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