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23 February 2012 A custom-made linear array transducer for photoacoustic breast imaging
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A custom-made first prototype of a linear array ultrasound transducer for breast imaging is presented. Large active area transducer elements (5 mm × 5 mm) with 1 MHz resonance frequency are chosen to obtain a relatively high sensitivity. Acoustic lenses are used to enlarge the narrow acceptance angle of such transducer elements. The minimum detectable pressure, frequency bandwidth and electrical impedance of the transducer elements are characterized. The results show the transducer has a minimum detectable pressure of 0.8 Pa, which is superior than the transducers used in the Twente Photoacoustic Mammoscope system previously developed in our group. The bandwidth of the transducer is relative small, however it can be improved when using optimized matching layer thickness in future. We also observed a strong lateral resonance at 330 kHz, which may cause problems in various aspects for a photoacoustic imaging system. We discuss the future improvement and plans for the transducer optimizations.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wenfeng Xia, Daniele Piras, Michelle Heijblom, Johan Van Hespen, Spiridon van Veldhoven, Christian Prins, Ton G. van Leeuwen, Wiendelt Steenbergen, and Srirang Manohar "A custom-made linear array transducer for photoacoustic breast imaging", Proc. SPIE 8223, Photons Plus Ultrasound: Imaging and Sensing 2012, 82233D (23 February 2012);

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