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4 March 2019 In vivo tissue micro-Raman spectroscopy with simultaneous reflectance confocal microscopy monitoring using a single laser (Conference Presentation)
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Abstract
Confocal Raman spectroscopy (CRS) is a noninvasive optical method capable of providing endogenous molecule fingerprinting information as well as allowing depth-resolved measurements into biological tissue. For precise data acquisition in highly scattering tissue in vivo, reflectance confocal microscopy (RCM) has been integrated as imaging guidance with confocal Raman spectroscopy system. However, building a CRS system for point of interest (POI) Raman measurement with simultaneous full field of view (FOV) RCM imaging using a single laser is a challenge. In this work, we addressed the challenge using an optical Faraday isolator to separate the returning reflectance confocal signal from the incident laser beam. A single laser source was used for both RCM and CRS measurements by utilizing two polarized beam splitters (PBS): one for splitting the beam into a RCM illumination beam and a CRS excitation beam; the other for merging the two beam together before entering the objective lens. The confocal setting minimizes the Raman signal contribution from the scanning RCM beam to as small as 0.18%. Furthermore, this small portion of Raman signal will not contaminate the CRS Raman spectrum because they are excited by the same laser wavelength. The co-registration of the sectioning plane of the RCM and CRS were confirmed to be within 0.2 micron. This new integrated confocal Raman system allowed us to acquire confocal Raman signals at specific POI under real-time full FOV RCM guidance and monitoring. Application examples for both ex vivo sample and in vivo skin measurements will be presented.
Conference Presentation
© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Zhenguo Wu, Liwei Jiang, Wenbo Wang, Jianhua Zhao, Harvey Lui, and Haishan Zeng "In vivo tissue micro-Raman spectroscopy with simultaneous reflectance confocal microscopy monitoring using a single laser (Conference Presentation)", Proc. SPIE 10851, Photonics in Dermatology and Plastic Surgery 2019, 108510U (4 March 2019); https://doi.org/10.1117/12.2513719
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