Advanced fluorescence imaging endoscopy using an acousto-optic tuneable filter

Maurice Patrick Whelan; Mounir Bouhifd; Marc Aprahamian

doi:10.1117/12.572045

29 July 2004 Advanced fluorescence imaging endoscopy using an acousto-optic tuneable filter

Maurice Patrick Whelan, Mounir Bouhifd, Marc Aprahamian

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Proceedings Volume 5486, ALT'03 International Conference on Advanced Laser Technologies: Biomedical Optics; (2004) https://doi.org/10.1117/12.572045
Event: ALT'03 International Conference on Advanced Laser Technologies: Biomedical Optics, 2003, Silsoe, United Kingdom

Abstract

Two novel prototype instruments for in vivo fluorescence-based medical diagnostics are described. The devices are based on an acousto-optic tuneable filter (AOTF) and can be easily attached to the eyepiece of most commercially available endoscopes. The instruments developed offer significant advantages over typical fixed-filter or filter-wheel fluorescence imaging systems in terms of flexibility, performance and diagnostic potential. Any filtering center-wavelength in the range from 450 to 700 nm can be rapidly selected either by random access or sequential tuning using simple commands delivered over a PC serial interface. In addition, both filtered and unfiltered light can be imaged to facilitate the direct association of fluorescence signals with specific anatomical sites. To demonstrate the system in vivo, a study of the diagnostic potential of fluorescence imaging for pancreatitis was conducted on rats. The aim was to detect extremely low-levels of endogenous protoporphyrin IX (PpIX) that has been shown to accumulate in early-stage diseased tissue undergoing an inflammatory response. Results show clearly that the device is effective in diagnosing mild pancreatitis in rats without the necessity of administering PpIX promoting agents such as ALA. Planning of human clinical trials is currently underway to demonstrate its potential as a tool for non-invasive early diagnosis of gastroenterological diseases.

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Maurice Patrick Whelan, Mounir Bouhifd, and Marc Aprahamian "Advanced fluorescence imaging endoscopy using an acousto-optic tuneable filter", Proc. SPIE 5486, ALT'03 International Conference on Advanced Laser Technologies: Biomedical Optics, (29 July 2004); https://doi.org/10.1117/12.572045

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KEYWORDS

Luminescence

Image filtering

Optical filters

Endoscopes

Imaging systems

Tissues

In vivo imaging

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