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2 March 2010 Point spread function of array transducers in 2D optoacoustic tomography
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In this work the spatial resolution provided by the array transducers in 2D optoacoustic (OA) imaging is considered numerically. The resolution is determined from the point spread function (PSF) of an array, that is a 2D OA image of a point source of the spherical acoustic wave. Numerical simulations consisted of the following steps. First, the OA signals excited by the point source and detected by each element of the array calculated using the Rayleigh integral. Radial backprojection algorithm was then employed to obtain the image of the point source in the imaging plane. The influence of the geometrical parameters of array elements, number of the detectors and a single detector bandwidth on the PSF was studied in detail. It was shown that the spatial resolution provided by the array transducer in the imaging plane can be unambiguously determined from the detector frequency band, array aperture angle and the width of a single array detector, and does not depend on the number of the detectors.
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Ivan M. Pelivanov, Varvara A. Simonova, Tatiana D. Khokhlova, and Alexander A. Karabutov "Point spread function of array transducers in 2D optoacoustic tomography", Proc. SPIE 7564, Photons Plus Ultrasound: Imaging and Sensing 2010, 756428 (2 March 2010);

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