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MR angiography using spin-lock flow tagging.

H Azhari1, C A McKenzie, R R Edelman

  • 1Department of Biomedical Engineering, Technion IIT, Haifa, Israel. haim@biomed.technion.ac.il

Magnetic Resonance in Medicine
|October 25, 2001
PubMed
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This study introduces a novel magnetic resonance angiography method using radiofrequency (RF) labeling. It visualizes blood flow without contrast agents, offering a new technique for MR angiography.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging
  • Radiology

Background:

  • Contrast-enhanced Magnetic Resonance Angiography (MRA) often requires intravenous contrast agents.
  • Image subtraction techniques can be complex and time-consuming.
  • Developing non-contrast MRA methods is crucial for patient safety and broader applicability.

Purpose of the Study:

  • To present a novel RF labeling technique for non-contrast-enhanced MR angiography.
  • To demonstrate the feasibility of visualizing inflowing blood without contrast agents or image subtraction.
  • To evaluate the proposed technique in phantoms and human volunteers.

Main Methods:

  • Utilized a slice-selective spin-lock pulse sequence for tagging inflowing blood spins.
  • Employed a specific RF pulse sequence including 90(x), 135(y)-n[360(y)]-135(y), and 90(-x) pulses, followed by a spoiler gradient.

Related Experiment Videos

  • Implemented a rapid imaging stage to acquire T(1)rho-weighted signals from tagged spins, suppressing untagged spins.

    • Main Results:

    • Successfully achieved contrast in MR angiography without injecting contrast material or performing image subtraction.
    • Demonstrated visualization of tagged blood bolus flow.
    • Confirmed the feasibility of the sequence in phantom studies and human volunteers using a 1.5T scanner.

    Conclusions:

    • The proposed RF labeling technique is a feasible method for non-contrast-enhanced MR angiography.
    • This technique offers a promising alternative for visualizing blood flow, potentially reducing risks associated with contrast agents.
    • Further research may explore optimization and clinical applications of this novel MRA approach.