Optoacoustic (OA) imaging utilizes short laser pulses to create acoustic sources in tissue and time resolved detection of generated pressure profiles for image reconstruction. The ultrasonic transients provide information on the distribution of optical absorption coefficient that can be useful for early cancer diagnostics. In this work a new design of wide-band array transducer is developed and tested. The array consists of 32 focused piezo-elements made of PVDF slabs imposed on a cylindrical surface. A single array element response to an OA signal coming from arbitrarily located point source is investigated theoretically and experimentally. The measured signals correspond well to numerically calculated ones. Focal zone maps of the elements with aperture angles 30° and 60° are presented and discussed; the resolution in direction perpendicular to the imaging plane is determined. Point spread function of the whole array is calculated using experimentally obtained signals from the sources located at different distances from the array. Backprojection algorithm is employed for reconstruction of the optoacoustic images. It is shown that the spatial resolution of the images yielded by the proposed array increases significantly compared to previous transducer designs.
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September 2004
September 07 2004
Focused array transducer for two-dimensional optoacoustic tomography
Victor Kozhushko;
Victor Kozhushko
International Laser Center of Moscow State University, 119992, Moscow, Russia
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Tanya Khokhlova;
Tanya Khokhlova
International Laser Center of Moscow State University, 119992, Moscow, Russia
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Alexei Zharinov;
Alexei Zharinov
International Laser Center of Moscow State University, 119992, Moscow, Russia
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Ivan Pelivanov;
Ivan Pelivanov
International Laser Center of Moscow State University, 119992, Moscow, Russia
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Vladimir Solomatin;
Vladimir Solomatin
International Laser Center of Moscow State University, 119992, Moscow, Russia
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Alexander Karabutov
Alexander Karabutov
International Laser Center of Moscow State University, 119992, Moscow, Russia
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Victor Kozhushko
Tanya Khokhlova
Alexei Zharinov
Ivan Pelivanov
Vladimir Solomatin
Alexander Karabutov
International Laser Center of Moscow State University, 119992, Moscow, Russia
J. Acoust. Soc. Am. 116, 1498–1506 (2004)
Article history
Received:
December 18 2003
Accepted:
June 22 2004
Citation
Victor Kozhushko, Tanya Khokhlova, Alexei Zharinov, Ivan Pelivanov, Vladimir Solomatin, Alexander Karabutov; Focused array transducer for two-dimensional optoacoustic tomography. J. Acoust. Soc. Am. 1 September 2004; 116 (3): 1498–1506. https://doi.org/10.1121/1.1781710
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