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Variable-rate selective excitation for rapid MRI sequences.

Brian A Hargreaves1, Charles H Cunningham, Dwight G Nishimura

  • 1Magnetic Resonance Systems Research Laboratory, Department of Electrical Engineering, Stanford University, CA, USA. brian@mrsrl.stanford.edu

Magnetic Resonance in Medicine
|August 31, 2004
PubMed
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Variable-rate selective excitation (VERSE) improves magnetic resonance imaging (MRI) slab profiles for faster 3D imaging. This technique enhances image quality and consistency at the edges of excited slices, crucial for balanced steady-state free precession (SSFP) sequences.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Pulse Sequence Design
  • Medical Physics

Background:

  • Balanced steady-state free precession (SSFP) sequences require short repetition times (TRs) to minimize off-resonance artifacts.
  • Slab-selective excitations improve imaging speed by limiting the field of view (FOV) but often suffer from poor slab profiles.
  • Short-duration excitations lead to unusable slices at slab edges due to flip-angle variations or aliasing.

Purpose of the Study:

  • To investigate the application of Variable-Rate Selective Excitation (VERSE) for improving slab profiles in SSFP imaging.
  • To design short-duration RF pulses with enhanced slab profiles using VERSE.
  • To assess the performance of VERSE pulses regarding flip-angle consistency, off-resonance sensitivity, and Specific Absorption Rate (SAR) at 1.5 T.

Main Methods:

Related Experiment Videos

  • Utilized Variable-Rate Selective Excitation (VERSE) to modify RF and gradient waveforms.
  • Designed short-duration RF pulses with improved slab profiles.
  • Evaluated pulse performance, including flip-angle variations, off-resonance effects, and SAR compliance at 1.5 T.

Main Results:

  • VERSE enabled the design of short-duration pulses with significantly improved slab profiles.
  • These pulses achieved high flip angles with minimal off-resonance sensitivity.
  • The technique met SAR limits at 1.5 T, demonstrating practical applicability.

Conclusions:

  • VERSE significantly enhances slab profiles in SSFP imaging, overcoming limitations of conventional short-duration excitations.
  • This advancement facilitates more rapid 3D imaging of limited volumes.
  • Improved slab profiles lead to more consistent image contrast across the excited slab, enhancing diagnostic utility.