20.500.12556/DiRROS-24078 Magnetic resonance imaging using a straight wire magnetic field for spatial signal encoding imaging verification with 2D experiments and 3D modeling 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 Bz 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 newly presented method, in which the signals are first transformed from the time- to the frequency-domain, yielding a distorted image (spectrum), which is then geometrically and intensity corrected. The quality of the reconstructed images was quantified by comparing them with corresponding reference images obtained with conventional gradient coils. The reconstruction method was accurate for all tested encoding coils and showed that the symmetric coil type produced results that required significantly less corrections compared to the nonsymmetric coil type. Quantitative image quality measurements showed that all encoding coils, despite large differences in the magnetic field of the encoding coils, produce images of similar quality. 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 switching times. spatial signal encoding gradient coils k-space nonlinear coils image reconstruction true false true Elsevier Nizozemska Angleški jezik Ni določen © 2025 The Authors. Neznano 2025-11-11 09:32:01 2025-11-11 09:32:01 2025-11-12 03:48:14 0000-00-00 00:00:00 2025 0 0 Nasl. z nasl. zaslona; Opis vira z dne 10. 11. 2025; str. 1-16 Vol. 381 Dec. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2025-06-22 2025-10-27 2025-10-30 53 1096-0856 10.1016/j.jmr.2025.107990 256516099 https://www.sciencedirect.com/science/article/pii/S1090780725001624?via%3Dihub 1 e66e0d92-bed8-11f0-94a7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=35795 RAZ_Tusar_Kaja_2025.pdf RAZ_Tusar_Kaja_2025.pdf 1 8BB70AFCD15141A9A6163368190587AB f76d5a7314ca9d0ddb82f94c34cb2cc2ecd3b47dd85fcfc2e26d5fd2e1630a1d 313bbcce-bed9-11f0-94a7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=35796 Institut Jožef Stefan 0 0 0