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Fig. 1 | Journal of Cardiovascular Magnetic Resonance

Fig. 1

From: Compressed sensing to accelerate magnetic resonance spectroscopic imaging: evaluation and application to 23Na-imaging of mouse hearts

Fig. 1

Layout of phantoms. a Layout of the virtual phantom. Five compartments were defined within the phantom representing aorta, myocardium, skeletal muscle, liver, and left ventricular blood pool (ROI1-5 respectively) with relative amplitudes of 5, 3, 1, 2, and 4. b The spectra corresponding to voxels within each compartment contain a single Lorentzian resonance at a unique frequency. Example spectra from each compartment within the virtual phantom, reconstructed at 64 × 64 voxels, are shown. Resonance frequencies for ROI1-5 were −1000, −500, 0, 500, 1000 Hz, respectively, with a T2 * of 50 ms. All spectra are plotted using the same axes. The small peak visible at −1000 Hz in ROI2 corresponds to signal contamination from ROI5. c 1H-MR image of the experimental phantom containing NaCl solutions (inner compartment: 20 mM NaCl; outer compartment: 100 mM NaCl). The two coaxial compartments on the left and right of the phantom contained 200 and 500 mM NaCl, respectively, and served as concentration references. The area used for data normalization is indicated by the dashed line (3.3 x 3.5 mm ROI), and the position of the surface coil used for 23Na signal reception is shown

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