T₁-Weighted Image by Ultra-Low Field SQUID-MRI

Investigation of the soybean infiltration process utilizing low-field nuclear magnetic resonance technology

“…NMR is a physical phenomenon in which nuclear magnetic resonance occurs by applying radio frequency pulses (RF) to a spinning atomic nucleus that is in a static magnetic field B 0 , causing the H protons in it to be excited [19,20]. Low-field Nuclear Magnetic Resonance (LF-NMR) technique is a new technique for NMR applications, which has the advantages of being rapid, non-destructive, and non-invasive, requiring fewer samples, and acquiring data in real-time [21][22][23]. Analyzing the LF-NMR signals and observing the NMR images, provides an intuitive reference for the study of the content of water [24][25][26], oil [27][28][29], and other components as well as the dynamic change process, and it can be used to determine the content of water and oil at the same time, as well as the content of different parts of water based on the differences in water mobility [30,31].…”

Low-field MRI at high magnetic field instability and inhomogeneity conditions

“…However, the SNR can be improved by different means, from a simple signal averaging to different hardware and computational contraptions. Some explored hardware solutions include, among other, hyperpolarization schemes [11], magnetic field-cycling technology [3,13,15], single or multiple receiver channels using superconducting quantum interference devices (SQUID) [16][17][18] and coupling to external resonators or magnetic lenses for signal enhancement [19][20][21]. Specially designed pulse sequences are also considered [22,23], while image pos-processing can be used to artificially enhance the image SNR [24,25].…”