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Abstract:
Imaging using nuclear magnetic resonance (NMR), i.e. Larmor fields comparable or even smaller to the earth magnetic field (∼ 50), is possible, and it has been widely demonstrated so far using precession frequencies above 1kHz. Recently, it has been shown that imaging is also possible at Larmor frequencies below 1 kHz, i.e. in the spectral band of the neuronal activity in the brain. Up to now, published ultra low field NMR images (ULF-MRI) were reconstructed using the magnitude of the FFT transform of the recorded NMR signals, but is not well know that at the ULF regimes the phase contrast could also provide important or complementary information. This works addressed the topic of phase imaging at ULF-MRI, i.e. images reconstructed using the phase of the FFT transform and it aims at comparing their properties in comparison with the standard magnitude MRI images. A comparison between
the two reconstruction modalities (phase and magnitude) at ULF-MRI is reported with the indication of similarities, differences and future perspective for medical applications like the direct neuronal imaging.
