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Magnetization preparation during the steady state: fat-saturated 3D TrueFISP
K Scheffler1, O Heid, J Hennig
1Section of Medical Physics, Department of Diagnostic Radiology, University of Freiburg, Germany. ksch@ukl.uni-freiburg.de
Magnetic Resonance in Medicine
|May 30, 2001
Summary
A new fat saturation method enhances TrueFISP MRI by suppressing bright fat signals without altering image contrast. This technique enables rapid 3D abdominal imaging within a single breath-hold.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Medical Physics
Background:
- Steady-state sequences like TrueFISP are valuable for rapid 3D imaging.
- Bright fat signals in TrueFISP can obscure anatomical details.
- Existing fat suppression methods may compromise image quality or sequence performance.
Purpose of the Study:
- To develop and evaluate a novel fat saturation technique for TrueFISP sequences.
- To maintain TrueFISP's inherent contrast while effectively suppressing fat signals.
- To enable efficient 3D abdominal MRI acquisition.
Main Methods:
- Integration of a spectral fat saturation block with spoiler gradients into a TrueFISP sequence.
- Utilizing a flip-back pulse to preserve steady-state transverse magnetization.
- Employing a preparation pulse to restore longitudinal magnetization after fat saturation.
- Periodic repetition of the fat saturation block within the TrueFISP acquisition.
Main Results:
- Successful suppression of fat signals in TrueFISP images.
- Preservation of TrueFISP's characteristic image contrast.
- No significant alteration of steady-state signal formation by the fat saturation block.
- Demonstration of 3D abdominal dataset acquisition within a single breath-hold.
Conclusions:
- The proposed fat saturation scheme effectively eliminates bright fat signals in TrueFISP MRI.
- This method offers identical image contrast to conventional TrueFISP.
- It facilitates rapid, high-quality 3D abdominal imaging, improving diagnostic utility.