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Journal Article

Signal behavior in continuously ramped 2D TrueFISP for whole-body imaging


Scheffler,  K
Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Fautz, H.-P., Leupold J, Hennig, J., & Scheffler, K. (2002). Signal behavior in continuously ramped 2D TrueFISP for whole-body imaging. Magnetic Resonance in Medicine, 48(6), 1085-1090. doi:10.1002/mrm.10323.

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A fast and robust imaging technique was developed based on a single-slice TrueFISP acquisition using a slice excitation frequency that is incremented, or spatially “ramped,” with each repetition. The short acquisition time of single slices allows artifact-free imaging during free breathing, which demonstrates the potential use of this technique for whole-body screening. Overlapping positioning of consecutively acquired slices was used to provide gapless volume coverage in free-breathing measurements. The image contrast of ramped TrueFISP was analyzed in detail using simulations and experiments. A high ramp speed results in an increased overall signal intensity and in a modification of the known T2/T1 contrast towards a proton density-weighted contrast. A further increase in imaging speed is achieved with z-interleaved phase-encoding trajectories based on weighted transitions between adjacent views.