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3 March 2014 Dual modality optoacoustic and laser ultrasound endoscopy system
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Ultrasound endoscopy has been proven effective in identifying and staging relatively advanced tumors in esophageal or colon wall lining. When combined with optoacoustic imaging modality, the endoscopy examination may prove beneficial in detecting also early stage tumors as well as more accurate staging of advanced tumors based on functional - anatomical maps. Here we present a prototype of a dual-modality optoacoustic – laser ultrasound (OA-LUS) endoscopy system with enhanced imaging capabilities. The system consists of a rotating 90° off-axis parabolic reflector which is acoustically coupled to a flat 8-element transducer array. A parabolic mirror serves dual purpose of directing light towards a sample and reflecting incoming optically generated ultrasound signals towards a detector. LUS modality is enabled by placing an optically absorbing and acoustically transparent polymeric membrane in the path of laser light to generate broadband and non-reverberating transient ultrasound waves propagating towards the sample. Focused system detects ultrasound signals and reconstructs the image similar to optoacoustic mode. Presence of a delay between optically generated and reflected acoustic signals allows concurrent image acquisition in OA and LUS modalities.
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Dmitri Tsyboulski, André Conjusteau, and Alexander Oraevsky "Dual modality optoacoustic and laser ultrasound endoscopy system", Proc. SPIE 8943, Photons Plus Ultrasound: Imaging and Sensing 2014, 89432S (3 March 2014);

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