Alonso-Ortiz Eva, Papp Daniel, Barry Robert L, Poëti Kyota, Seifert Alan C, Gilbert Kyle M, Lopez-Rios Nibardo, Paska Jan, Eippert Falk, Weiskopf Nikolaus, Beghini Laura, Graedel Nadine N, Trampel Robert, Callaghan Martina F, Aigner Christoph S, Freund Patrick, Seif Maryam, Destruel Aurélien, Callot Virginie, Vannesjo Johanna, Cohen-Adad Julien
NeuroPoly Lab, Department of Electrical Engineering, Polytechnique Montreal, Montreal, Quebec, Canada.
Centre de recherche du CHU Sainte-Justine, Université de Montréal, Montreal, Quebec, Canada.
Magn Reson Med. 2025 Sep;94(3):1339-1355. doi: 10.1002/mrm.30551. Epub 2025 May 20.
PURPOSE: The depth within the body, small diameter, long length, and varying tissue surrounding the spinal cord impose specific considerations when designing RF coils. The optimal coil configuration for 7 T cervical spinal cord MRI is unknown and currently there are very few coil options. The purpose of this work was (1) to establish a quality control protocol for evaluating 7 T cervical spinal cord coils, and (2) to use that protocol to evaluate the performance of four different coil designs. METHODS: Three healthy volunteers and a custom anthropomorphic phantom (the traveling spines cohort) were scanned at seven 7 T imaging centers using a common protocol and each center's specific cervical spinal cord coil. Four different coil designs were tested (two in-house, one Rapid Biomedical, and one MRI.TOOLS design). RESULTS: The Rapid Biomedical coil was found to have the highest efficiency, whereas one of the in-house designs (NeuroPoly Lab) had the highest SNR and the largest spinal cord coverage. The MRI.TOOLS coil had the most uniform profile along the cervical spinal cord; however, it was limited in its ability to provide the requested flip angles (especially for larger individuals). The latter was also the case for the second in-house coil (MSSM). CONCLUSION: The results of this study serve as a guide for the spinal cord MRI community in selecting the most suitable coil based on specific requirements and offer a standardized protocol for assessing future coils.
目的:脊髓所处的身体深度、小直径、长长度以及周围不同的组织,在设计射频线圈时需要特殊考虑。7T颈椎脊髓MRI的最佳线圈配置尚不清楚,目前线圈选择非常少。本研究的目的是:(1)建立用于评估7T颈椎脊髓线圈的质量控制方案;(2)使用该方案评估四种不同线圈设计的性能。 方法:三名健康志愿者和一个定制的仿真人体模型(移动脊柱队列)在七个7T成像中心接受扫描,采用通用方案并使用每个中心特定的颈椎脊髓线圈。测试了四种不同的线圈设计(两种内部设计、一种Rapid Biomedical产品和一种MRI.TOOLS产品)。 结果:发现Rapid Biomedical线圈效率最高,而其中一种内部设计(NeuroPoly Lab)信噪比最高且脊髓覆盖范围最大。MRI.TOOLS线圈沿颈椎脊髓的轮廓最均匀;然而,它提供所需翻转角的能力有限(尤其是对体型较大的人)。第二种内部线圈(MSSM)也是如此。 结论:本研究结果为脊髓MRI领域根据特定需求选择最合适的线圈提供了指导,并为评估未来线圈提供了标准化方案。
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