Marques, DM;
Sheppard, O;
Zhang, EZ;
Beard, PC;
Munro, PRT;
Guggenheim, JA;
(2023)
Interrogating Fabry-Perot ultrasound sensors with Bessel beams for photoacoustic imaging.
In:
Proceedings Volume 12631, Opto-Acoustic Methods and Applications in Biophotonics VI; 126310U (2023).
SPIE: Munich, Germany.
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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 focussed 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.
Type: | Proceedings paper |
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Title: | Interrogating Fabry-Perot ultrasound sensors with Bessel beams for photoacoustic imaging |
Event: | European Conferences on Biomedical Optics, 2023 |
ISBN-13: | 9781510664715 |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1117/12.2675686 |
Publisher version: | https://doi.org/10.1117/12.2675686 |
Language: | English |
Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng |
URI: | https://discovery.ucl.ac.uk/id/eprint/10178714 |
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