MP‐SAGE: A new MP‐RAGE sequence with enhanced SNR and CNR for brain imaging utilizing square‐spiral phase encoding and variable flip angles

Magnetic Resonance in Medicine - Tập 56 Số 4 - Trang 824-834 - 2006
Tony Stöcker1, N. Jon Shah2,1,3
1Institut für Medizin, Forschungszentrum Jülich GmbH, Jülich, Germany
2Brain Imaging Center West, Jülich, Germany
3Institute of Physics, University of Dortmund, Dortmund, Germany

Tóm tắt

AbstractThe magnetization‐prepared rapid gradient‐echo (MP‐RAGE) sequence is well known and widely used for high‐resolution, structural brain MRI. Here we present a new version, termed magnetization‐prepared spiral acquisition gradient‐echo (MP‐SAGE), that employs interleaved square‐spiral phase‐encoding (PE) to take advantage of the 3D nature of the sequence. Resolution loss caused by point‐spread function (PSF) blurring is circumvented by the use of variable flip angle (VFA) radiofrequency (RF) pulses. The pulse train is calculated by means of an accurate new signal evolution theory that is derived from the extended phase graph (EPG) description. Phantom results show excellent agreement between theory and experiment for substances with relaxation times similar to those of human brain tissue. Both phantom and in vivo results show a strong enhancement of SNR and CNR compared to the standard MP‐RAGE in high‐resolution MRI. The benefits for brain tissue segmentation using images obtained with MP‐SAGE are shown. Magn Reson Med, 2006. © 2006 Wiley‐Liss, Inc.

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Magnetic Resonance in Medicine

Tập 56 Số 4

824-834

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