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Related Experiment Videos

MR angiography using steady-state free precession.

Thomas K F Foo1, Vincent B Ho, Hani B Marcos

  • 1Applied Science Laboratory, GE Medical Systems, Baltimore, Maryland 21287, USA. thomas.foo@med.ge.com

Magnetic Resonance in Medicine
|September 28, 2002
PubMed
Summary
This summary is machine-generated.

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Steady-state free precession (SSFP) pulse sequences enable high signal-to-noise ratio (SNR) visualization of vascular structures long after contrast injection. This contrast-enhanced MR angiography (CE-MRA) method offers a second imaging window with high spatial resolution.

Area of Science:

  • Radiology
  • Medical Imaging
  • Magnetic Resonance Imaging

Background:

  • Contrast-enhanced MR angiography (CE-MRA) is crucial for vascular imaging.
  • Traditional CE-MRA techniques have limitations in visualizing delayed vascular phases.
  • Steady-state free precession (SSFP) offers potential for improved SNR in MR angiography.

Purpose of the Study:

  • To describe and evaluate contrast-enhanced MR angiography (CE-MRA) using steady-state free precession (SSFP) pulse sequences.
  • To assess the feasibility of visualizing vascular structures at delayed time points post-contrast administration.
  • To investigate methods for optimizing image quality and reducing background noise in delayed CE-MRA.

Main Methods:

  • Utilized steady-state free precession (SSFP) pulse sequences for CE-MRA.

Related Experiment Videos

  • Administered 0.2 mmol/kg of Gd-chelate contrast media.
  • Evaluated signal decay of blood SSFP signal over 30 minutes.
  • Implemented a mask subtraction scheme using spin echo SSFP-S(-) acquisition.

    • Main Results:

    • SSFP sequences allowed visualization of vascular structures with high signal-to-noise ratio (SNR) at delayed time points.
    • Peak blood SSFP signal diminished by less than 20% at 30 minutes post-contrast.
    • The method provided a second opportunity for imaging with high SNR and spatial resolution.
    • Mask subtraction effectively reduced stationary background signal.

    Conclusions:

    • CE-MRA with SSFP sequences is effective for visualizing vascular structures with high SNR at delayed phases.
    • This technique expands the imaging window for arterial and venous assessment.
    • The described methods enhance image quality and diagnostic utility of delayed CE-MRA.