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Related Experiment Videos

Multiphase segmented k-space velocity mapping in pulsatile flow waveforms

V P Poutanen1, R Kivisaari, A M Häkkinen

  • 1Department of Radiology, Helsinki University Central Hospital, Finland. veli-pekka.poutanen@huch.fi

Magnetic Resonance Imaging
|June 11, 1998
PubMed
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Breath-hold segmented k-space flow sequences improve magnetic resonance imaging quality by reducing motion artifacts. However, increasing lines per segment (LPS) leads to inaccurate velocity measurements, with LPS 7 or more being clinically irrelevant.

Area of Science:

  • Cardiovascular Imaging
  • Magnetic Resonance Imaging (MRI)
  • Flow Quantification

Background:

  • Respiratory motion degrades image quality in abdominal and cardiothoracic MRI.
  • Segmented k-space acquisition shortens imaging time, enabling single breath-holds.
  • Breath-hold cine flow imaging allows evaluation of flow in various thoracic and abdominal regions, including coronary arteries.

Purpose of the Study:

  • To determine the precision of flow measurement using breath-hold segmented k-space flow sequences.
  • To assess the impact of varying lines per segment (LPS) on flow measurement accuracy.
  • To establish the clinical relevance of different LPS values for coronary flow assessment.

Main Methods:

  • Pulsatile flow in a phantom tube was studied using segmented k-space flow sequences.

Related Experiment Videos

  • The number of k-space ky-lines per segment (LPS) was systematically varied.
  • Velocity curves and flow correlations were analyzed as a function of LPS.

    • Main Results:

    • Velocity curves exhibited a time shift that was linearly dependent on LPS.
    • Mean velocity (Vmean) remained constant (40.1 ± 2.9 cm/s).
    • Correlation between theoretical and experimental flow curves showed a linear decrease with increasing LPS (C = -0.977 * LPS).

    Conclusions:

    • Velocity curves shift and smooth with increasing LPS in breath-hold velocity mapping.
    • Higher LPS values result in more inaccurate flow measurements.
    • LPS values of 7 or greater are not considered clinically relevant for accurate flow quantification.