Fig 4. Reconstructed T₂ maps in a physical phantom.

In short T₂ regions such as tubes 4 and 7, Fourier-based fast T₂ mapping methods either underestimate (c) or overestimate (d) high spatial frequency signal, resulting in blurring and edge enhancement respectively. While the proposed nonlinear reconstruction method has decreased stability for short T₂s relative to long T₂s, as visible in tube 7 of (b), the overall error remains consistently low (e). All accelerated methods used 1/4^th of the full dataset.