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Are TrueFISP images T2/T1-weighted?


Huang I-J, Chen C-Y, Scheffler,  K
Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Huang, T.-Y., Huang I-J, Chen C-Y, Scheffler, K., Chung, H.-W., & Cheng, H.-C. (2002). Are TrueFISP images T2/T1-weighted? Magnetic Resonance in Medicine, 48(4), 684-688. doi:10.1002/mrm.10260.

Images acquired using the TrueFISP technique (true fast imaging with steady-state precession) are generally believed to exhibit T2/T1-weighting. In this study, it is demonstrated that with the widely used half-flip-angle preparation scheme, approaching the steady state requires a time length comparable to the scan time such that the transient-state response may dominate the TrueFISP image contrast. Two-dimensional images of the human brain were obtained using various phase-encoding matrices to investigate the transient-state signal behavior. Contrast between gray and white matter was found to change significantly from proton-density- to T2/T1-weighted as the phase-encoding matrix size increased, which was in good agreement with theoretical predictions. It is concluded that TrueFISP images in general exhibit T2/T1-contrast, but should be more appropriately regarded as exhibiting a transient-state combination of proton-density and T2/T1 contrast under particular imaging conditions. Interpretation of tissue characteristics from TrueFISP images in clinical practice thus needs to be exercised with caution.