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3 March 2014 Dependence of photoacoustic signal generation on the transducer and source type
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The influence of size, geometry, temporal response of finite sensors and source geometry on the detected photoacoustic pressure is explored. We started considering the transducer simulated by a mesh of point-like sensors connected in parallel, which implies that appropriate modeling of pressure depends on the discretization size of the sensing surface. On the other hand, in analogy with the approach for the finite sensor, a finite source can be considered as a set of point like sources. We simulated the pressure produced by the linear, cylindrical and spherical source geometries, located at certain position over an axis perpendicular to the sensing surface. In order to simulate the photoacoustic signal, the computed pressure was convolved with the impulse response of two kind of commercial sensors: a low frequency transducer (3.5 MHz) and a high frequency transducer (125 MHz). Taking a fixed coordinate system we investigated the signal variations when the translational degree of freedom was modified. We found that simulated pressure generated by the different geometries using the proposed approach clearly differs from the point-like detection model.
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C. A. Bravo-Miranda, A. González-Vega, and G. Gutiérrez-Juárez "Dependence of photoacoustic signal generation on the transducer and source type", Proc. SPIE 8943, Photons Plus Ultrasound: Imaging and Sensing 2014, 89434T (3 March 2014);

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