Magnetic resonance imaging using a straight wire magnetic field for spatial signal encoding : imaging verification with 2D experiments and 3D modeling

Spatial encoding in MRI is usually performed using gradient coils that produce a linearly increasing magnetic field B_z in a desired spatial direction such that its gradient is constant. However, it has been shown that spatial encoding in MRI can also be performed with coils that produce nonlinear magnetic fields. In this study, the performance of different types of nonlinear encoding coils, which have a simple design based on the use of a straight wire segment as a building block and a source of a highly nonlinear magnetic field, was experimentally tested in 2D and by simulation in 3D on coils with a nonsymmetric and a symmetric arrangement of these wire segments.  All images were reconstructed using our new reconstruction method, in which the signals spatially encoded by nonlinear coils are first transformed from the time- to the frequency-domain, yielding a distorted image (spectrum), which is then geometrically and intensity corrected. The results of the study may help advance the design of “gradient” coils towards freer geometries, higher magnetic field gradients or lower inductance and thus faster imaging.

TUŠAR, Kaja, SERŠA, Igor. Magnetic resonance imaging using a straight wire magnetic field for spatial signal encoding : imaging verification with 2D experiments and 3D modeling. Journal of magnetic resonance. Dec. 2025, vol. 381, str. 1-16, ilustr. ISSN 1096-0856. https://www.sciencedirect.com/science/article/pii/S1090780725001624, DOI: 10.1016/j.jmr.2025.107990. [COBISS.SI-ID 256516099]