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Related Experiment Videos

Variable-density one-shot Fourier velocity encoding.

Julie C DiCarlo1, Brian A Hargreaves, Krishna S Nayak

  • 1Department of Electrical Engineering, Stanford University, Stanford, California 94305-9510, USA. julie@mrsrl.stanford.edu

Magnetic Resonance in Medicine
|August 10, 2005
PubMed
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Variable-density sampling enhances real-time blood flow imaging by improving velocity resolution and field of view (FOV). This method allows for accurate measurement of high velocities, crucial for diagnosing conditions like stenosis.

Area of Science:

  • Medical imaging
  • Fluid dynamics
  • Biomedical engineering

Background:

  • High-resolution, real-time imaging is critical for assessing pulsatile and turbulent blood flow.
  • One-dimensional Fourier velocity encoding (FVE) offers real-time velocity measurement with reduced off-resonance effects.

Purpose of the Study:

  • To introduce variable-density sampling to improve velocity measurements in FVE.
  • To enhance velocity resolution and field of view (FOV) without increasing scan time or aliasing.

Main Methods:

  • Developed and compared two FVE sequences utilizing variable-density sampling.
  • Acquired kz-kv space data with variable-density sampling.
  • Validated measurements using a tube flow phantom, stenosis phantom, and healthy volunteers.

Related Experiment Videos

  • Compared results with Doppler ultrasound (US).

    • Main Results:

    • Variable-density acquisition significantly improved velocity resolution and FOV.
    • Achieved unambiguous velocity measurements up to 5 m/s without aliasing.
    • Demonstrated enhanced FOV for capturing velocities in stenotic ranges.
    • Measurements showed good agreement with Doppler US.

    Conclusions:

    • Variable-density sampling is effective for enhancing FVE imaging.
    • This technique improves the ability to measure high velocities and diagnose vascular conditions like stenosis.
    • Offers a valuable advancement for real-time cardiovascular imaging.