Rafael Luis O'Halloran1, Murat Aksoy1, Tobias Kober2, Roland Bammer1
1Department of Radiology, Stanford University, Stanford, CA, United States; 2Laboratory for functional and metabolic imaging, Ecole Polytechnique Fdrale de Lausanne, Lausanne, Switzerland
A simple method of respiratory monitoring using the phase of the DC term of k-space collected with a spiral k-space trajectory is presented and compared with the measurement from the respiratory bellows. The method presented is shown to be in excellent agreement with the measurement from the respiratory bellows and reveal even cardiac pulsatility. In this work the method is used to gate a spiral-trajectory scan of the liver. The image reconstructed with the DC phase used for gating was qualitatively similar to the one reconstructed using conventional gating. Since the image data is used for gating no additional navigators must be acquired.