Optimized spectrally selective steady-state free precession sequences for cartilage imaging at ultra-high fields

  • O. Bieri
  • T. C. Mamisch
  • S. Trattnig
  • O. Kraff
  • M. E. Ladd
  • K. Scheffler
Research Article

DOI: 10.1007/s10334-007-0092-0

Cite this article as:
Bieri, O., Mamisch, T.C., Trattnig, S. et al. Magn Reson Mater Phy (2008) 21: 87. doi:10.1007/s10334-007-0092-0
  • 102 Downloads

Abstract

Object

Fat suppressed 3D steady-state free precession (SSFP) sequences are of special interest in cartilage imaging due to their short repetition time in combination with high signal-to-noise ratio. At low-to-high fields (1.5–2.0 T), spectral spatial (spsp) radio frequency (RF) pulses perform superiorly over conventional saturation of the fat signal (FATSAT pulses). However, ultra-high fields (7.0 T and more) may offer alternative fat suppression techniques as a result of the increased chemical shift.

Materials and methods

Application of a single, frequency selective, RF pulse is compared to spsp excitation for water (or fat) selective imaging at 7.0 T.

Results

For SSFP, application of a single frequency selective RF pulse for selective water or fat excitation performs beneficially over the commonly applied spsp RF pulses. In addition to the overall improved fat suppression, the application of single RF pulses leads to decreased power depositions, still representing one of the major restrictions in the design and application of many pulse sequences at ultra-high fields.

Conclusion

The ease of applicability and implementation of single frequency selective RF pulses at ultra-high-fields might be of great benefit for a vast number of applications where fat suppression is desirable or fat–water separation is needed for quantification purposes.

Keywords

SSFP Ultra-high fields Water excitation Fat suppression 

Copyright information

© ESMRMB 2007

Authors and Affiliations

  • O. Bieri
    • 1
  • T. C. Mamisch
    • 2
  • S. Trattnig
    • 3
  • O. Kraff
    • 4
  • M. E. Ladd
    • 4
  • K. Scheffler
    • 1
  1. 1.MR Physics, Department of Medical RadiologyUniversity of BaselBaselSwitzerland
  2. 2.Orthopedic Surgery DepartmentInselspitalBernSwitzerland
  3. 3.MR Center, Department of RadiologyMedical University of ViennaViennaAustria
  4. 4.Erwin L. Hahn Institute for Magnetic Resonance ImagingUniversity Duisburg-EssenEssenGermany

Personalised recommendations