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23 February 2012 Optoacoustic microscopy system based on an off-axis parabolic reflector
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In this report we introduce a novel experimental design for non-invasive scanning optoacoustic microscopy that utilizes an off-axis parabolic mirror. Such reflector provides ideal and lossless conversion of a spherical wavefront into a plane wave and enables diffraction-limited ultrasound focusing. We have designed and build a custom broadband transducer with 0-19 MHz bandwidth and nominal sensitivity of 15 μV/Pa. With 17 dB amplification and noise level of ~ 1.6 mV the estimated sensitivity limit of our experimental setup is 15 Pa. Using the reflector with numerical aperture of 0.5, we have demonstrated lateral resolution limit of ~ 100 micrometers in test phantoms.
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Dmitri Tsyboulski, André Conjusteau, and Alexander A. Oraevsky "Optoacoustic microscopy system based on an off-axis parabolic reflector", Proc. SPIE 8223, Photons Plus Ultrasound: Imaging and Sensing 2012, 82230Z (23 February 2012);

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