Interrogating Fabry-Perot ultrasound sensors with Bessel beams for photoacoustic imaging

Dylan M. Marques; Oliver Sheppard; Edward Z. Zhang; Paul C. Beard; Peter R. T. Munro; James A. Guggenheim

doi:10.1117/12.2675686

11 August 2023 Interrogating Fabry-Perot ultrasound sensors with Bessel beams for photoacoustic imaging

Dylan M. Marques, Oliver Sheppard, Edward Z. Zhang, Paul C. Beard, Peter R. T. Munro, James A. Guggenheim

Proceedings Volume 12631, Opto-Acoustic Methods and Applications in Biophotonics VI; 126310U (2023) https://doi.org/10.1117/12.2675686
Event: European Conferences on Biomedical Optics, 2023, Munich, Germany

Abstract

Photoacoustic Tomography (PAT) systems based on Fabry-Perot (FP) sensors provide high-resolution images limited by the system’s sensitivity. The sensitivity is limited by the optical Q-factor of the FP cavity (i.e., the optical confinement of the interrogation laser beam in the FP cavity). In existing systems, a focused Gaussian beam is used to interrogate the sensor. While providing a small acoustic element required for high-resolution imaging, this interrogation beam naturally diverges inside the FP cavity, leading to the current sensitivity limit. To break this limit, a new approach of interrogating the FP sensor using a Bessel beam is investigated. The Noise Equivalent Pressure (NEP) and both axial and lateral PAT resolutions using Bessel beam interrogation were quantified. Bessel beam interrogation provided lower NEP, similar axial resolution, but lower lateral resolution. Thus, Bessel beam might be an alternative interrogation scheme for deep PAT imaging as high sensitivity is needed and the lateral resolution is limited by the aperture of the PAT system.

Citation Download Citation

Dylan M. Marques, Oliver Sheppard, Edward Z. Zhang, Paul C. Beard, Peter R. T. Munro, and James A. Guggenheim "Interrogating Fabry-Perot ultrasound sensors with Bessel beams for photoacoustic imaging", Proc. SPIE 12631, Opto-Acoustic Methods and Applications in Biophotonics VI, 126310U (11 August 2023); https://doi.org/10.1117/12.2675686

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KEYWORDS

Bessel beams

Sensors

Acquisition tracking and pointing

Gaussian beams

Acoustics

Frequency response

Ultrasonography

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