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Fig. 2 | Journal of Cardiovascular Magnetic Resonance

Fig. 2

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

Fig. 2

Example reconstruction of virtual phantom. Normalized signal amplitude maps (PE = 32, SNR = 32) are shown in the left column for (a) FT reconstructed fully-sampled data, and CS reconstructed data for (b) R = 1, (c) R = 3, and (d) R = 5. Example spectra from ROI2 and ROI3 are shown in the middle two columns. The ROI from which each resonance originates is indicated above the spectra. Due to blurring of compartment boundaries, there is signal contamination from compartments 3 and 5 evident in the spectrum for compartment 2; likewise the signal amplitude of the peaks in compartment 2 is reduced relative to the FT data. Note the denoising effect of the CS reconstruction as acceleration factor increases. All images and all spectra are plotted on the same scale. Correlation plots of FT reconstructed noise-free signal amplitudes against raw CS reconstructed amplitudes (i.e. not normalized) for the same data are depicted in the right column for R = 1, 3 and 5. Linear regression yielded slopes of 2.52, 2.61 and 2.53, with R2 values of 0.96, 0.96, and 0.94, respectively. All correlation plots share the same horizontal axis

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