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This study enhances medical ultrasound imaging field of view (FOV) by increasing element size, not element count. Advanced beamformers like Minimum Variance (MV) improve resolution, crucial for better diagnostic imaging.

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Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Acoustic Engineering

Background:

  • Medical ultrasound applications often require a larger imaging field of view (FOV).
  • Current linear array probes are limited by element count for FOV expansion.
  • Increasing element size offers an alternative approach to enhance FOV.

Purpose of the Study:

  • To investigate increasing the FOV of linear array probes by increasing element size.
  • To analyze the impact of element coupling on array beam patterns and image quality.
  • To evaluate advanced beamforming techniques for resolution recovery with larger elements.

Main Methods:

  • Utilized coupled elements to simulate larger element sizes.
  • Examined array beam patterns using Fourier transforms.
  • Acquired phantom and in-vivo (rabbit tumor) images using plane-wave compounding.
  • Employed a positioning system for virtual large aperture data acquisition (120 mm FOV).
  • Investigated Null Subtraction Imaging (NSI), Sign Coherence Factor (SCF), and Minimum Variance (MV) beamformers.

Main Results:

  • Element coupling effects on beam patterns were analyzed.
  • Image quality metrics (resolution, contrast, speckle SNR) were assessed.
  • The MV beamformer demonstrated superior resolution improvement (0.78 mm to 0.54 mm FWHM) without increasing speckle variance.
  • MV beamforming effectively compensated for resolution loss due to increased F-number with larger elements.

Conclusions:

  • Increasing element size is a viable strategy for expanding ultrasound FOV.
  • Advanced beamformers, particularly MV, are essential for maintaining and improving image resolution with larger elements.
  • This approach holds potential for enhanced diagnostic capabilities in medical ultrasound.