A Kerfless PVDF Array for Photoacoustic Imaging

Reza Pakdaman Zangabad, Geert Springeling, Emile Noothout, Robert H.S.H. Beurskens, Nico de Jong, Antonius F.W. Van Der Steen, Gijs Van Soest, Verya Daeichin

    Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

    2 Citations (Scopus)

    Abstract

    Photoacoustic signals can have very large bandwidth and large dynamic range. With appropriate electrical impedance matching, off-resonance PVDF transducers offer the bandwidth and sensitivity to fully capture these signals. Minimizing pitch and kerf in ultrasound transducer to improve lateral resolution is of great importance. Kerfless arrays, where the electrodes are patterned onto the piezoelectric material, fulfill such a demand and are simpler to manufacture. We have manufactured and characterized a kerfless off resonance PVDF array of 10 elements with dimensions of 1mm×1.5mm×28μm(w×h×t) both numerically and experimentally for PA imaging. We matched the high impedance of the PVDF elements with low impedance of acquisition system through an appropriate LNA (26 dB amplification over 10 MHz BW). PA signals from a tungsten wire with a diameter of 35 μm were received with our device, and compared to those recorded with a 0.2 mm needle hydrophone. Based on simulation and measurement results, the phase change in the off-resonance PVDF is negligible. The crosstalk between adjacent elements is −30dB. We measured a sensitivity for our array of about 1.38 μV/Pa at 3 MHz. The RMS output noise level is 240 uV over the entire bandwidth (10Hz-10 MHz).
    Original languageEnglish
    Title of host publication2018 IEEE International Ultrasonics Symposium (IUS)
    EditorsK. Hashimoto , C. Ruppel
    PublisherIEEE
    Number of pages4
    ISBN (Electronic)978-1-5386-3425-7
    DOIs
    Publication statusPublished - 2018
    Event2018 IEEE International Ultrasonics Symposium, IUS 2018 - Portopia Hotel, Kobe, Japan
    Duration: 22 Oct 201825 Oct 2018

    Conference

    Conference2018 IEEE International Ultrasonics Symposium, IUS 2018
    Abbreviated titleIUS 2018
    CountryJapan
    CityKobe
    Period22/10/1825/10/18

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