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Related Concept Videos

Parallel Resonance01:23

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
Reducing Line Loss01:18

Reducing Line Loss

In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...

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Reducing color flow artifacts caused by parallel beamforming.

Torbjorn Hergum1, Tore Bjastad, Lasse Lovstakken

  • 1Department of Circulation and Medical Imaging, Faculty of Medicine, Norwegian University of Science and Technology (NTNU), Trondheim, Norway. torbjorn.hergum@ntnu.no

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|April 10, 2010
PubMed
Summary
This summary is machine-generated.

Interpolating autocorrelation estimates from overlapping beams significantly reduces artifacts in parallel receive beamforming for color flow imaging. This method maintains high frame rates and image quality in medical diagnosis.

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Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Signal Processing

Background:

  • Color flow imaging faces a trade-off between frame rate and image quality.
  • Parallel receive beamforming improves frame rates but introduces artifacts.
  • Discontinuities in Doppler velocity estimates arise from beam curvature differences.

Purpose of the Study:

  • To reduce artifacts in parallel receive beamforming for color flow imaging.
  • To mitigate bias in Doppler velocity estimates.
  • To maintain high frame rates without compromising image quality.

Main Methods:

  • Developed an interpolation method for autocorrelation estimates from overlapping receive beams.
  • Acquired beams with time differences across interleaving groups or 3-D scan planes.
  • Evaluated the impact of interpolation on Doppler velocity discontinuities and image quality.

Main Results:

  • Interpolation of autocorrelation estimates significantly reduced parallel beamforming artifacts.
  • The method effectively minimized discontinuities in Doppler velocity estimates.
  • High frame rates were maintained with minimal image quality deterioration.

Conclusions:

  • Interpolation of autocorrelation estimates is an effective technique for artifact reduction in parallel receive beamforming.
  • This approach enables high-quality, high-frame-rate color flow imaging for medical diagnosis.
  • The method addresses key limitations in current ultrasound imaging techniques.