NDLI: All-optical transducer for ultrasound and photoacoustic imaging by dichroic filtering

Content Provider	IEEE Xplore Digital Library
Author	Bao-Yu Hsieh Sung-Liang Chen Tao Ling Guo, L.J. Pai-Chi Li
Copyright Year	2012
Description	Author affiliation: Grad. Inst. of Biomed. Electron. & Bioinf., Nat. Taiwan Univ., Taipei, Taiwan (Bao-Yu Hsieh; Pai-Chi Li) \|\| Dept. of Electr. Eng. & Comput. Sci., Univ. of Michigan, Ann Arbor, MI, USA (Sung-Liang Chen; Tao Ling; Guo, L.J.)
Abstract	The ultrasound (US) and photoacoustic (PA) multi-modality imaging has the advantages of combining good acoustic resolution with high optical contrast. An all-optical transducer for both imaging modalities can simplify the entire system design and miniaturize the imaging scanhead for intravascular imaging applications. In this study, we propose and demonstrate an all-optical US/PA transducer using a thin plate for optoacoustic generation for US imaging, a microring resonator for acoustic detection, and a dichroic filter to switch between the two imaging modes. In other words, a dichroic (i.e., a color filter) is used to selectively pass light depending on the imaging mode. When under US imaging, the light hits the color filter to generate US for US imaging. When under PA imaging, the light pass through the color filter and directly hits the image object. The experimental image results indicated that the US and PA imaging modes can be selected by switching the laser wavelengths using a dichroic filter. The imaging resolution and contrast were improved by applying the synthetic aperture focusing technique (SAFT). The axial and lateral resolutions of the implemented imaging system were 125μm and 2.52°, respectively, while application of the SAFT enhanced the contrast by about 5dB.
Starting Page	1410
Ending Page	1413
File Size	1163464
Page Count	4
File Format	PDF
ISBN	9781467345613
ISSN	19485719
e-ISBN	9781467345620
DOI	10.1109/ULTSYM.2012.0352
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-10-07
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical filters Optical imaging Optical resonators Ultrasonic imaging Image resolution Resonator filters Dichroic filter Photoacoustic imaging All-optical design
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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