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A prototype was built and evaluated via numerical modeling, simulations, RF measurements, empirical tests, and comparisons with a conventional surface coil of identical size and geometry. Results: The array shows improved B1 efficiency (B1+ and B1−), lower SAR, and high-frequency operation potential compared with the conventional coil. Conclusion and significance: The approach enables scalable, efficient ultrahigh-field spine RF performance without complex multi-channel 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efficiency for both transmit and receive fields and improved SAR behavior.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},407138,1790863367,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,101,106,110,115,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & 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Manuscript Author Manuscript  \n\n| | HHS Public Access\u003Cbr>Author manuscript\u003Cbr>IEEE Trans Biomed Eng. Author manuscript; available in PMC 2026 January 01. |\n| --- | --- |\n\nPublished in final edited form as:  \nIEEE Trans Biomed Eng. 2026 January ; 73(1): 442–450. doi:10.1109/TBME.2025.3584217 .  \nA coupled multimodal planar transmit RF array for ultrahigh fieldspine MR imaging  \nYunkun Zhao [Student Member, IEEE],  \nDepartment of Biomedical Engineering, State University of New York at Buffalo, Buffalo, NY 14260 USA  \nKomlan Payne [Graduate Student Member, IEEE],  \nDepartment of Biomedical Engineering, State University of New York at Buffalo, Buffalo, NY 14260 USA  \nLeslie Ying [Fellow, IEEE],  \nDepartments of Biomedical Engineering and Electrical Engineering, State University of New York at Buffalo, Buffalo, NY 14260 USA  \nXiaoliang Zhang [Member, IEEE]  \nDepartments of Biomedical Engineering and Electrical Engineering, State University of New York at Buffalo, Buffalo, NY 14260 USA  \nAbstract  \nObjective: Ultrahigh-field MRI, such as those operating at 7 Tesla, enhances diagnostic capabilities but also presents unique challenges, including the need for advanced RF coil designs to achieve an optimal signal-to-noise ratio and transmit efficiency, particularly when imaging large samples.  \nMethods: In this work, we introduce the coupled planar array, a novel technique for highfrequency, large-size RF coil design with enhanced the RF magnetic field (B1) efficiency and transmit performance for ultrahigh-field spine imaging applications. This array comprises multiple resonators that are electromagnetically coupled to function as a single multimodal resonator.  \nThe field distribution of its highest frequency mode is suitable for spine imaging applications.  \nBased on the numerical modeling and calculation, a prototype of the coupled planar array was constructed and its performance was evaluated through comprehensive numerical simulations, rigorous RF measurements, empirical tests, and a comparison against a conventional surface coil with the same size and geometry.  \nResults: The results of this study demonstrate that the proposed coupled planar array exhibits superior performance compared to conventional surface coils in terms of B1 efficiency for both transmit (B1+) and receive (B1−) fields, specific absorption rate (SAR), and the ability to operate at high frequencies.  \nThis work is licensed under a Creative Commons Attribution 4.0 License. For more information, see [https://creativecommons.org/](https://creativecommons.org/)[ ](https://creativecommons.org/)[licenses/by/4.0/](licenses/by/4.0/)  \n[Corresponding author: Xiaoliang Zhang. xzhang89@buffalo.edu](Corresponding author: Xiaoliang Zhang. xzhang89@buffalo.edu).  \nAuthor Manuscript Author Manuscript Author Manuscript Author Manuscript  \nZhao et al. Page 2  \nConclusion: This study suggests a promising and efficient approach to the design of highfrequency, large-size RF coils for spine MR imaging at ultrahigh magnetic fields.  \nSignificance: The coupled planar array offers a practical solution to overcome scalability and efficiency limitations in ultrahigh-field spine MRI, enabling improved RF performance without requiring complex multi-channel systems.  \nIndex Terms—  \nUltra-high field; RF Coil; Surface Coil; B 1 Efficiency; Specific Absorption Rate; MR imaging  \nI. Introduction  \nMagnetic Resonance Imaging (MRI) is a pivotal technology for visualizing soft tissues and determining metabolic processes, providing high-resolution images with varied contrasts without employing ionizing radiation [1, 2]. Advancements in MRI technology have led to the development of high and ultrahigh field systems, notably the 7 Tesla MRI, which is now increasingly utilized in clinical settings [3–10] . The transition to a higher static magnetic field strength, from the standard 1.5T or 3T to 7T, significantly enhances the signal-to-noise ratio (SNR) [11–1","cbCainH62MYu65l9","https://ap.wps.com/l/cbCainH62MYu65l9","pdf",3470014,27,"English","# Abstract\n# Introduction\n## Ultrahigh-field MRI benefits and system transition to 7T\n## Challenges in large transmit RF coil design at ultrahigh frequency\n## Multichannel transmit approaches and motivation","[{\"question\":\"What problem does the coupled planar RF array address in ultrahigh-field spine MRI?\",\"answer\":\"It targets the need for advanced large-size transmit RF coil designs that provide high B1 efficiency and transmit performance at ultrahigh frequencies, overcoming limitations from inductance and scalability constraints.\"},{\"question\":\"How does the proposed array work?\",\"answer\":\"It uses multiple resonators electromagnetically coupled to function as a single multimodal resonator, with a field distribution in its highest-frequency mode suitable for spine imaging.\"},{\"question\":\"What evidence demonstrates performance improvements over a conventional surface coil?\",\"answer\":\"Performance is supported by numerical modeling and simulations, RF measurements, empirical testing, and direct comparison with a conventional surface coil matched in size and geometry, showing superior B1 efficiency for both transmit and receive fields and improved SAR behavior.\"}]","A coupled multimodal planar transmit RF array for ultrahigh fieldspine MR imaging | PDF",1790570651,68]