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Related Concept Videos

Ultrasonography01:17

Ultrasonography

Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called a...
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Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...

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Related Experiment Video

Updated: May 16, 2026

Evaluating Targeting Accuracy in the Focal Plane for an Ultrasound-guided High-intensity Focused Ultrasound Phased-array System
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Increasing ultrasound field-of-view with reduced element count arrays containing large elements.

Mick Gardner1, Rita J Miller1, Michael L Oelze1

  • 1Electrical and Computer Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA.

The Journal of the Acoustical Society of America
|May 14, 2026
PubMed
Summary

This study enhances medical ultrasound imaging by increasing the field of view (FOV) using coupled elements to simulate wider elements. This method improves resolution and maintains image quality without increasing element count.

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Area of Science:

  • Medical imaging
  • Ultrasound technology
  • Acoustic engineering

Background:

  • Medical ultrasound applications often require a larger field of view (FOV) for better diagnostic capabilities.
  • Current linear array probes have limitations in FOV, impacting diagnostic accuracy.
  • Increasing element width is a potential strategy to expand FOV.

Purpose of the Study:

  • To investigate the feasibility of increasing the FOV of linear array ultrasound probes by increasing element width.
  • To evaluate the performance of coupled elements as a method to simulate larger element widths.
  • To assess the impact of increased element width on image quality metrics like resolution, contrast, and speckle SNR.

Main Methods:

  • Coupled elements were designed and fabricated to mimic larger element widths.
  • Fourier analysis, theoretical pressure amplitudes, and bandwidth estimations were used for theoretical validation.
  • Phantom and in vivo (rabbit tumor) imaging were performed using plane wave compounding.
  • A positioning system facilitated data acquisition for a virtual large aperture (120 mm FOV).
  • Null subtraction imaging (NSI), sign coherence factor, and minimum variance (MV) beamformers were compared.

Main Results:

  • Coupled elements closely approximated the behavior of large elements in terms of pressure amplitude and bandwidth.
  • Plane wave compounding with coupled elements showed effects on resolution, contrast, and speckle SNR.
  • The NSI beamformer significantly reduced the full-width at half-maximum (FWHM) of wire targets by 79% compared to uncoupled DAS.
  • The MV beamformer excelled at preserving speckle statistics while enhancing resolution.
  • A virtual large aperture of 120 mm FOV was successfully reconstructed.

Conclusions:

  • Increasing element width through coupling is an effective strategy to expand the FOV of linear array ultrasound probes.
  • This approach achieves a larger FOV without requiring an increase in the total number of elements.
  • Advanced beamforming techniques like NSI and MV are crucial for mitigating resolution loss associated with wider elements.