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System Description

Each transducer module is a 16-element linear array, with complete electromagnetic shielding and waterproofing. The standard 256-element open-UST imaging system is formed by assembling 16 of these modules into a ring array.

Each module has the following specifications:

  • Ring array diameter: 220 mm
  • PZT elevation height: 10 mm
  • PZT lateral width: 1 mm
  • PZT thickness: 1 mm
  • PZT pitch: 2.54 mm
  • Transmit-Receive watershot data characteristics (N = 256):
    • Resonance frequency: 1.21 MHz 7.1 kHz
    • Amplitude deviation at resonance: 7.9%
    • 6 dB FBW (1.08 MHz - 1.41 MHz): 29% 6.1%
    • 12 dB FBW (924 kHz - 1.58 MHz): 54% 4.9%
    • 40 dB FBW (528 kHz - 2.61 MHz): 170% 3.0%
    • Signal to noise ratio: 61.2 dB 1.2 dB
    • Receive cross talk: -37.1 dB 6.0 dB
  • Beam Pattern (N = 64):
    • Elevational skew: 0.457 0.207
    • Lateral skew: 1.169 0.834
    • Elevational -6 dB beamwidth: 16.3 mm 0.456 mm
    • Lateral -6 dB opening angle: 55.4 2.96
  • Electrical Input Impedance (N = 128):
    • Phase at resonance: -8.58 4.96
    • Magnitude at resonance: 1114 121

Further Reading

  • M. Roberts, E. Martin, M. Brown, B. Cox and B. Treeby, "Transducer Module Development for an Open-Source Ultrasound Tomography System," 2021 IEEE International Ultrasonics Symposium (IUS), 2021, pp. 1-4, doi: 10.1109/IUS52206.2021.9593866 Available for download here
  • M. Roberts, E. Martin, M. Brown, B. Cox and B. Treeby, "Matching Layer Deposition for an Open-Source Ultrasound Tomography System: Inter-Element Variation in Frequency Response," 2022 IEEE International Ultrasonics Symposium (IUS), 2022, pp. 1-4, doi: 10.1109/IUS54386.2022.9957739 Available for download here
  • Roberts, Morgan, Eleanor Martin, Michael D. Brown, Ben T. Cox, and Bradley E. Treeby. "open-UST: An Open-Source Ultrasound Tomography Transducer Array System." arXiv preprint arXiv:2302.10114 (2023) doi: 10.48550/arXiv.2302.10114

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