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

Tušar, Kaja (author), Serša, Igor (author)

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 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.

• Language: English
• Keywords: spatial signal encoding, gradient coils, k-space, nonlinear coils, image reconstruction, magnetic resonance imaging
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: MF - Faculty of Medicine
• Publication status: Published
• Publication version: Version of Record
• Year: 2025
• Number of pages: 16 str.
• Numbering: Vol. 381, art. 107990
• PID: 20.500.12556/RUL-175932
• UDC: 53
• ISSN on article: 1096-0856
• DOI: 10.1016/j.jmr.2025.107990
• COBISS.SI-ID: 256516099
• Publication date in RUL: 23.12.2025

Record is a part of a journal

• Title: Journal of magnetic resonance
• Shortened title: J. magn. res.
• Publisher: Elsevier
• ISSN: 1096-0856
• COBISS.SI-ID: 18272295

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: magnetna resonanca, slikanje z magnetno resonanco

Projects

• Funder: ARIS - Slovenian Research and Innovation Agency
• Project number: P1-0060
• Name: Eksperimentalna biofizika kompleksnih sistemov in slikanje v biomedicini