title: Dual Modality Noncontact Photoacoustic and Spectral Domain OCT Imaging.
abstract: We developed a multimodal imaging system, combining noncontact photoacoustic imaging and optical coherence tomography (OCT). Photoacoustic signals are recorded without contact to the specimens' surface by using an interferometric technique. The interferometer is realized within a fiber-optic network using a fiber laser at 1550 nm as source. The fiber-optic network allows the integration of a fiber-based OCT system operating at a wavelength region around 1310 nm. Light from the fiber laser and the OCT source are multiplexed into one fiber using wavelength-division multiplexing. The same focusing optics is used for both modalities. Back-reflected light from the sample is demultiplexed and guided to the respective imaging systems. As the same optical components are used for OCT and photoacoustic imaging, the obtained images are co-registered intrinsically in lateral direction. Three-dimensional imaging is implemented by hybrid galvanometer and mechanical scanning. To allow fast B-scan measurements, scanning of the interrogation beam along one dimension is executed by a galvanometer scanner. Slow-axis scanning, perpendicular to the fast axis, is performed utilizing a linear translational stage. We demonstrate two-dimensional and three-dimensional imaging on agarose phantoms.
authors.affiliation: Research Center for Non-Destructive Testing GmbH (RECENDT), Linz, Austria.
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Leiss-Holzinger
authors.affiliation: Research Center for Non-Destructive Testing GmbH (RECENDT), Linz, Austria.
authors.forename: Johannes
authors.initials: J
authors.lastname: Bauer-Marschallinger
authors.affiliation: Research Center for Non-Destructive Testing GmbH (RECENDT), Linz, Austria.
authors.forename: Armin
authors.initials: A
authors.lastname: Hochreiner
authors.affiliation: Research Center for Non-Destructive Testing GmbH (RECENDT), Linz, Austria.
authors.forename: Philipp
authors.initials: P
authors.lastname: Hollinger
authors.affiliation: Research Center for Non-Destructive Testing GmbH (RECENDT), Linz, Austria thomas.berer@recendt.at.
authors.forename: Thomas
authors.initials: T
authors.lastname: Berer
mesh_terms: D004867:Equipment Design; D005336:Fiber Optic Technology; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D064847:Multimodal Imaging / Q000379:methods*; D019047:Phantoms, Imaging; D061088:Photoacoustic Techniques / Q000379:methods*; D013057:Spectrum Analysis; D041623:Tomography, Optical Coherence / Q000379:methods*
keywords: galvanometer scanning; interferometry; optical coherence tomography; photoacoustic imaging; remote sensing