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Starter sequence for steady-state free precession imaging.

D L Foxall1

  • 1Philips Medical Systems (Cleveland), Inc., 595 Miner Road, Cleveland, OH 44143, USA. david.foxall@philips.com

Magnetic Resonance in Medicine
|March 31, 2005
PubMed
Summary
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A new starter sequence speeds up balanced steady-state free precession (bSSFP) imaging by preconditioning the spin system. This improved sequence uniformly excites the steady-state response and suppresses artifacts for faster, clearer MRI scans.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biophysics

Background:

  • Balanced steady-state free precession (bSSFP) imaging relies on achieving a dynamic equilibrium.
  • This equilibrium formation is slow, depending on spin-spin (T2) and spin-lattice (T1) relaxation times.
  • Imaging before equilibrium leads to artifacts from signal oscillations.

Purpose of the Study:

  • To present an improved starter sequence for bSSFP MRI.
  • To reduce the delay before imaging by efficiently establishing steady-state conditions.
  • To enhance image quality by suppressing artifacts.

Main Methods:

  • Development of a novel starter sequence design.
  • Utilizing phase cycling within the starter sequence.
  • Characterization of the sequence's performance across various resonance offsets.

Related Experiment Videos

Main Results:

  • The improved starter sequence uniformly excites the steady-state response for all resonance offsets.
  • Phase cycling effectively suppresses banding artifacts.
  • Significantly reduced delay before imaging is achieved.

Conclusions:

  • The presented starter sequence accelerates bSSFP imaging by rapidly achieving steady-state conditions.
  • This method offers uniform excitation and artifact suppression, improving MRI efficiency and image quality.