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A multicontrast imaging method using steady-state free precession with alternating RF flip angles.

Joonsoo Kim1, Hyunseok Seo1, Seohee So1

  • 1Department of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea.

Magnetic Resonance in Medicine
|May 11, 2018
PubMed
Summary

A new magnetic resonance imaging (MRI) method uses alternating radiofrequency (RF) pulses in a steady-state free precession (SSFP) sequence to create multicontrast images, including fat-suppressed views for better diagnosis.

Keywords:
balanced steady-state free precession (bSSFP)condition numberfat suppressionmulticontrast imagingsingular-value decomposition

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Techniques

Background:

  • Conventional balanced SSFP sequences produce unique contrasts by combining FID and echo signals.
  • Achieving multicontrast imaging and fat suppression typically requires separate sequences or complex setups.

Purpose of the Study:

  • To introduce a novel multicontrast imaging method using SSFP with alternating RF flip angles.
  • To generate multicontrast images, including fat-suppressed contrast images, for enhanced diagnostic capabilities.

Main Methods:

  • The proposed method employs a balanced SSFP sequence with two alternating RF flip angles and RF phase cycling.
  • This technique allows for the acquisition of various image contrasts weighted by proton density, T1, and T2.
  • Multicontrast images with fat suppression are obtained by combining two images acquired after alternating RF pulses.

Main Results:

  • Simulations, phantom studies, and in vivo experiments demonstrated the method's efficacy.
  • The technique successfully produced multicontrast knee images, including fat-suppressed contrast images.
  • The results validate the potential of the proposed SSFP method for generating diverse image contrasts.

Conclusions:

  • The novel SSFP-based multicontrast imaging method provides valuable fat-suppressed images.
  • This technique can serve as a useful tool for clinical diagnosis, including cartilage segmentation and rapid lesion screening.
  • The proposed method offers an efficient approach to obtaining comprehensive imaging information in a single scan.