Focused array transducer for two-dimensional optoacoustic tomography
| Autor: | A. N. Zharinov, V. V. Kozhushko, Vladimir S. Solomatin, T.D. Khokhlova, Ivan Pelivanov, Alexander A. Karabutov |
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| Rok vydání: | 2004 |
| Předmět: |
Physics
Point spread function Photoacoustic effect Acoustics and Ultrasonics business.industry Aperture Acoustics Transducers Iterative reconstruction Equipment Design Models Theoretical Image Enhancement Signal Optics Transducer Arts and Humanities (miscellaneous) Neoplasms Humans Ultrasonic sensor Ultrasonics business Image resolution Tomography |
| Zdroj: | The Journal of the Acoustical Society of America. 116(3) |
| ISSN: | 0001-4966 |
| Popis: | 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 degrees and 60 degrees 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. |
| Databáze: | OpenAIRE |
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