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High-resolution 3D gradient echo (GRE) MRI at 4.7 T. (a) 3D MRI of flowing ∼20 mM HP propane gas with 0.5 × 0.5 × 0.5 mm3 spatial and 17.7 s temporal resolution with 32 × 32 × 32 mm3 field of view. (b) The corresponding image of still thermally polarized 55 M tap water and (c) photograph of spiral phantom used for MRI imaging studies shown in (a) and (b). Signal-to-noise ratio (SNR) values are provided for representative voxels marked with white asterisk (*).
