https://doi.org/10.1140/epjp/s13360-025-06917-6
Regular Article
Radio frequency measurements in Magnetic Resonance Imaging
1 Institute of Electrical Engineering, Chinese Academy of Sciences, 100190, Beijing, People’s Republic of China
2 School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, 101408, Beijing, People’s Republic of China
3 Department of Radiology, China-Japan Friendship Hospital, 100029, Beijing, People’s Republic of China
4 Graduate School of Peking Union Medical College, Chinese Academy of Medical Sciences and Peking Union Medical College, 100730, Beijing, People’s Republic of China
a
lxn@mail.iee.ac.cn
b
maguolin1007@qq.com
Received:
6
August
2025
Accepted:
29
September
2025
Published online: 15 October 2025
Magnetic resonance imaging (MRI) was a great invention for medicine, particularly in soft tissue diagnosis. The variety of the modalities and methodologies developed in MRI, from contrast weighted imagings to tissue properties imagings and from rapid imagings to functional imagings, has enriched the identification of various diseases. Due to the proton density nature of the signal, routine MRI has to imaging weightedly according to either the Longitudinal Relaxation Time or Transverse Relaxation Time. Here, we present a Method (MRIM) to measure the radio frequency magnetic fields in the context of MRI. Based on the common concepts of magnitude ratio and phase difference, triple scan sequences of Fast Spin Echo are designed with special flip angles and receive bandwidths to manipulate the magnetization. Inside tissue, the magnetic fields induced during the excitation as well as those spontaneous during the detection are elaborated, which is further beneficial to magnetic resonance-based electrical properties tomography (MR-EPT). The feasibility is verified by three phantoms having different electromagnetic properties; the consistence of the conductivity results between Helmholtz MR-EPT and instrumentation probe is up to 84.5%. In a preclinical experiment, we also demonstrate the proposed Method with healthy and stroked candidates, respectively. The electric properties maps achieved reveal moderately resolved anatomical structures, while the corresponding values are reasonable and keeping in physical range. With the feature of quantification, advanced MRI is promising to be used in the differential diagnosis non-invasively as well as without contrast agent, under the fact of the significant difference in tissue electromagnetic properties.
Supplementary Information The online version contains supplementary material available at https://doi.org/10.1140/epjp/s13360-025-06917-6.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
