Abstract #3689

Optimal Flip Angle Formula for SWIFT and CEA (Concurrent Excitation and Acquisition) MRI

Serhat Ilbey¹, Michael Garwood², Michael Bock¹, and Ali Caglar Özen^1,3

¹Dept. of Radiology, Medical Physics, Medical Center – University of Freiburg, Freiburg, Germany, ²Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota, Minneapolis, MN, United States, ³German Consortium for Translational Cancer Research Partner Site Freiburg, German Cancer Research Center (DKFZ), Heidelberg, Germany

MR imaging of tissue components with extremely fast transverse relaxation times require advanced MRI techniques such as continuous SWIFT (cSWIFT), Concurrent Excitation and Acquisition (CEA), and full duplex MRI. Frequency modulated pulses are used in these methods. A steady-state signal model with transverse relaxation term was formulated and solved for an arbitrary frequency and phase modulated RF pulse. An accurate expression for the optimal flip angle was derived. The performance of the new formulation was verified by a home-made Bloch equation simulator for T₂ values between 10µs and 100ms.

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