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Related Experiment Videos

Efficient dynamic focus control for three-dimensional imaging using two-dimensional arrays.

Pai-Chi Li1, Jing-Jung Huang

  • 1Department of Electrical Engineering, National Taiwan University, Taipei. paichi@cc.ee.ntu.edu.tw

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|September 24, 2002
PubMed
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This study introduces an efficient dynamic focus control scheme for ultrasonic array imaging. The method simplifies complex computations for 3D imaging, reducing controller needs and quantization levels with minimal impact on image quality.

Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Signal Processing

Background:

  • Dynamic receive focusing in ultrasonic array imaging demands significant real-time computation and data transfer.
  • Implementing dynamic focusing in 3D imaging with fully sampled 2D arrays is challenging due to high channel counts.

Purpose of the Study:

  • To propose an efficient dynamic focus control scheme for delay-and-sum beamformers in ultrasonic array imaging.
  • To simplify the complex computational and data communication requirements of dynamic focusing, especially for 3D applications.

Main Methods:

  • The proposed scheme divides overall delay into range-independent steering and range-dependent focusing terms.
  • Approximation of the range-dependent focusing term, inversely proportional to range, simplifies control.

Related Experiment Videos

  • A non-uniform quantization scheme for focusing delay values is devised using aperture growth controlled by a constant f/number.

    • Main Results:

    • The scheme significantly simplifies dynamic focus control with minimal degradation in focusing quality at shallow depths.
    • A design example shows a 4096-element array requires only 227 controllers for the focusing term.
    • Only 28 non-uniform quantization levels achieve comparable quality to 784 uniform levels, with slight sidelobe increase below 3 cm.

    Conclusions:

    • The proposed dynamic focus control scheme offers an efficient solution for ultrasonic array imaging, particularly for 3D applications.
    • The method effectively reduces computational load and hardware requirements.
    • The scheme maintains high focusing quality across various imaging depths.