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Blood flow measurement using variable velocity encoding in the RR interval

M H Buonocore1

  • 1Department of Radiology, UC Davis Medical Center, Sacramento.

Magnetic Resonance in Medicine
|June 1, 1993
PubMed
Summary
This summary is machine-generated.

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This study modified velocity-encoded phase imaging to use two velocity encodings per cardiac cycle. This improved the accuracy of ascending aorta flow measurements, particularly during diastole.

Area of Science:

  • Cardiovascular imaging
  • Medical physics
  • Flow dynamics

Background:

  • Velocity-encoded phase imaging relies on a single velocity encoding value per cardiac cycle.
  • Current methods limit accuracy due to the constant encoding throughout the cardiac cycle.
  • Optimizing velocity sensitivity is crucial for precise flow quantification.

Purpose of the Study:

  • To modify velocity-encoded phase imaging to incorporate dual velocity encodings within a single RR interval.
  • To enhance the accuracy and precision of ascending aorta blood flow measurements.
  • To evaluate the impact of variable velocity encoding on flow quantification.

Main Methods:

  • Modified the pulse sequence and raw data interpolation/reconstruction scheme.
  • Implemented two distinct velocity encoding values within the RR interval: 200 cm/s for systole and 30 cm/s for diastole.

Related Experiment Videos

  • Compared flow measurements using the modified dual-encoding technique against standard single-encoding methods.

    • Main Results:

    • The modified sequence successfully allowed for two distinct velocity encodings per RR interval.
    • Utilizing a lower diastolic encoding value (30 cm/s) significantly improved measurement accuracy.
    • Enhanced precision in ascending aorta flow quantification was observed with the dual-encoding approach.

    Conclusions:

    • Dual velocity encoding within the RR interval is feasible and beneficial for cardiovascular imaging.
    • Adjusting diastolic velocity encoding improves the accuracy of ascending aorta flow measurements.
    • This technique offers a more precise method for assessing cardiac blood flow dynamics.