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Improved SNR in linear reordered 2D bSSFP imaging using variable flip angles.

Dominik Paul¹, Maxim Zaitsev

¹Department of Diagnostic Radiology, Medical Physics, University Hospital Freiburg, Freiburg, Germany. dominik.paul@uniklinik-freiburg.de

Magnetic Resonance Imaging

|March 17, 2009

Summary

This summary is machine-generated.

This study introduces a variable flip-angle technique for balanced steady-state free precession (bSSFP) MRI. This method enhances signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) without increasing specific absorption rate (SAR).

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Area of Science:

Magnetic Resonance Imaging (MRI)
Medical Physics

Background:

Balanced steady-state free precession (bSSFP) is a widely used MRI technique.
Optimizing signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) while managing specific absorption rate (SAR) remains a challenge, especially at higher field strengths.

Purpose of the Study:

To present a novel variable flip-angle approach for bSSFP imaging.
To demonstrate increased SNR and CNR while maintaining or reducing SAR.

Main Methods:

Implementing a variable flip-angle strategy during the echo train using a trigonometric function.
Combining flip-angle variation with linear k-space reordering, sampling outer k-space with a low flip angle (αmin) and central k-space with a high flip angle (αmax).
No dummy cycles or additional preparation were used.

Main Results:

Achieved significant SNR gains (up to 50%) by utilizing the transient phase signal.
Demonstrated the ability to use higher flip angles (e.g., 47 degrees vs. conventional 34 degrees at 3T) within SAR limits.
Observed no transient artifacts and maintained image resolution in volunteer studies.

Conclusions:

Variable flip-angle techniques effectively enhance SNR and CNR in bSSFP imaging.
This approach is particularly valuable for higher magnetic field strengths due to SAR constraints.
Flip-angle variation can be synergistically combined with other techniques like parallel imaging for further SAR reduction.