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European Radiology Experimental
Fig. 1 | European Radiology Experimental

Fig. 1

From: Improved accuracy and precision of fat-suppressed isotropic 3D T2 mapping MRI of the knee with dictionary fitting and patch-based denoising

Fig. 1

The Lib3DGRE pulse sequence used for T2 mapping of the knee and the following reconstruction techniques. a An adiabatic T2-prep module with variable duration precedes a GRE segment of Np = 100 readouts with LIBRE water excitation. This is followed by a period to recover magnetization and to lower the effective energy deposition (SAR) of the T2-prep. Note that the total segment duration is fixed. Echo time TE = 3.24 ms, TR = 6.96 ms, receiver bandwidth 301 Hz/px. b The three image reconstruction and mapping techniques compared in this study are as follows: (I) an analytic map of a standard GRAPPA-reconstructed image (AnT2Fit); (II) a dictionary map of the same image (DictT2Fit); and (III) a dictionary map of an HD-PROST-denoised version of that image (DenDictT2Fit). The color coding (red, green, black) of the three techniques is used throughout this study. GRAPPA Generalized autocalibrating partially parallel acquisitions, GRE Gradient-recalled echo, HD-PROST High-dimensionality undersampled patch-based reconstruction, Lib3DGRE LIBRE-enabled three-dimensional GRE pulse sequence, LIBRE Lipid-insensitive binomial off-resonant radiofrequency excitation, SAR Specific absorption rate, T2-prep T2 preparation

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