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Related Experiment Videos

[Flow direction-sensitive spin-echo MR angiography]

A Bücker1, A Glowinski, G Adam

  • 1Klinik für Radiologische Diagnostik, Medizinische Fakultät, Rheinisch-Westfälische Technische Hochschule Aachen.

Rofo : Fortschritte Auf Dem Gebiete Der Rontgenstrahlen Und Der Nuklearmedizin
|July 1, 1997
PubMed
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New contrast agents hinder standard angiography. A modified spin echo sequence effectively displays unidirectional arterial and venous blood flow, suppressing stationary tissue, even after contrast agent administration.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging
  • Biomedical Engineering

Background:

  • New blood pool contrast agents significantly shorten T1 relaxation time of blood.
  • This T1 shortening compromises conventional time-of-flight and phase-contrast angiography sensitivity to flow direction.
  • Existing techniques struggle to visualize specific flow directions post-contrast administration.

Purpose of the Study:

  • To develop and validate a specialized spin echo sequence for selective arterial and venous flow display.
  • To test the hypothesis that this sequence can overcome limitations imposed by contrast agents.
  • To enable directional flow-sensitive MR angiography in the presence of blood pool contrast agents.

Main Methods:

  • Application of parallel slice-selective 90-degree and 180-degree radiofrequency pulses.

Related Experiment Videos

  • Utilizing a modified spin echo sequence with variable slice distance.
  • Conducting flow phantom studies and in vivo experiments in pigs following iron oxide particle administration.

    • Main Results:

    • The modified spin echo sequence successfully displayed unidirectional flow.
    • Stationary tissue was completely suppressed in the resulting MR angiograms.
    • The sequence demonstrated flow sensitivity for a single direction without contrast agents and in vivo.
    • The technique relies on locally off-centered pulses, enabling selective proton refocusing.

    Conclusions:

    • A specially designed spin echo sequence can achieve selective display of arterial and venous flow.
    • This method is effective even after the administration of blood pool contrast agents.
    • The technique requires no special hardware or additional postprocessing, offering a practical solution for directional angiography.