title: An All-Fiber-Optic Combined System of Noncontact Photoacoustic Tomography and Optical Coherence Tomography.
abstract: We propose an all-fiber-based dual-modal imaging system that combines noncontact photoacoustic tomography (PAT) and optical coherence tomography (OCT). The PAT remotely measures photoacoustic (PA) signals with a 1550-nm laser on the surface of a sample by utilizing a fiber interferometer as an ultrasound detector. The fiber-based OCT, employing a swept-source laser centered at 1310 nm, shares the sample arm of the PAT system. The fiber-optic probe for the combined system was homemade with a lensed single-mode fiber (SMF) and a large-core multimode fiber (MMF). The compact and robust common probe is capable of obtaining both the PA and the OCT signals at the same position without any physical contact. Additionally, the MMF of the probe delivers the short pulses of a Nd:YAG laser to efficiently excite the PA signals. We experimentally demonstrate the feasibility of the proposed dual-modal system with a phantom made of a fishing line and a black polyethylene terephthalate fiber in a tissue mimicking solution. The all-fiber-optic system, capable of providing complementary information about absorption and scattering, has a promising potential in minimally invasive and endoscopic imaging.
authors.affiliation: Department of Medical System Engineering, Institute of Integrated Technology, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Korea. eomjonghyun@gist.ac.kr.
authors.forename: Jonghyun
authors.initials: J
authors.lastname: Eom
authors.affiliation: School of Information and Communications, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Korea. jgshine@gist.ac.kr.
authors.forename: Jun Geun
authors.initials: JG
authors.lastname: Shin
authors.affiliation: School of Information and Communications, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Korea. shpark88@gist.ac.kr.
authors.forename: Soongho
authors.initials: S
authors.lastname: Park
authors.affiliation: School of Information and Communications, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Korea. rim@gist.ac.kr.
authors.forename: Sunghwan
authors.initials: S
authors.lastname: Rim
authors.affiliation: School of Information and Communications, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Korea. leebh@gist.ac.kr.
authors.forename: Byeong Ha
authors.initials: BH
authors.lastname: Lee
keywords: fiber-optic imaging; interferometry; multimodal imaging; noncontact measurement; optical coherence tomography; photoacoustic imaging