Abstract #1809

Concurrent Excitation and Acquisition in Steady State: T1-Modulation Effects of Frequency Sweep

Ali Caglar Özen¹, Jan Korvink², and Michael Bock¹

¹Dept. of Radiology - Medical Physics, University Medical Center Freiburg, Freiburg, Germany, ²Institute of Microstructure Technology, Karlsruhe Institute of Technology, Karlsruhe, Germany

Concurrent Excitation and Acquisition (CEA) enables MRI with true zero echo times, and full signal acquisition efficiency. However, frequency sweep along readout gradients results in sequential excitation of spins at different locations, thus a unique TR is experienced by each spin at each radial acquisition spoke. In this work, implications of modulations in transverse magnetization as a function of T1, flip angle and TR were investigated for 2D and 3D radial acquisition schemes with equidistant point trajectory, segmented ordering and golden angle ordering. Resulting changes in point spread function (PSF) of a point source located at the edge of the field of view (FOV) were analyzed and discussed.

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