An 8-channel Tx dipole and 20-channel Rx loop coil array for MRI of the cervical spinal cord at 7 Tesla.
An 8-channel Tx dipole and 20-channel Rx loop coil array for MRI of the cervical spinal cord at 7 Tesla.
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8 通道 Tx 偶极子和 20 通道 Rx 环形线圈阵列，用于 7 特斯拉颈脊髓 MRI。
DOI：
10.1002/nbm.5002
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发表时间：
2023
影响因子：
2.9
通讯作者：
Cohen-Adad,Julien
中科院分区：
文献类型：
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作者：
Lopez-Rios,Nibardo;Gilbert,KyleM;Papp,Daniel;Cereza,Gaspard;Foias,Alexandru;Rangaprakash,Deshpande;May,MarkusW;Guerin,Bastien;Wald,LawrenceL;Keil,Boris;Stockmann,JasonP;Barry,RobertL;Cohen-Adad,Julien
通过使用定制的射频（RF）线圈解决方案进行磁场成像，可以提高颈髓图像的质量;然而，目前用于脊髓的商业和研究7-T RF线圈很少，特别是具有并行传输（pTx）功能的线圈。这项工作提出了一个pTx/Rx线圈的设计，测试和验证的人颈部和颈部/上胸脊髓。pTx部分由八个偶极子组成，以确保在脊髓的这个大区域上的高度均匀性。Rx部分由20个半自适应重叠环路组成，以在患者人群中产生高信噪比（SNR）。线圈外壳的设计有利于患者定位和舒适性，同时也是紧密配合，以确保高灵敏度。我们展示了RF匀场功能，以优化B1+均匀性，功率效率和/或比吸收率效率。在成人志愿者中评价了B1+均匀性、SNR和g因子，并证明了从枕叶到T4-T5水平的出色性能。我们将申报弹簧圈与两种最先进的头部和头颈部弹簧圈进行了比较，证实了其在脊髓颈部和上胸部区域的优越性。因此，该线圈解决方案提供了一个令人信服的平台，用于产生上脊髓临床和研究扫描所需的高质量图像。
The quality of cervical spinal cord images can be improved by the use of tailored radiofrequency (RF) coil solutions for ultrahigh field imaging; however, very few commercial and research 7‐T RF coils currently exist for the spinal cord, and in particular, those with parallel transmission (pTx) capabilities. This work presents the design, testing, and validation of a pTx/Rx coil for the human neck and cervical/upper thoracic spinal cord. The pTx portion is composed of eight dipoles to ensure high homogeneity over this large region of the spinal cord. The Rx portion is made up of twenty semiadaptable overlapping loops to produce high signal‐to‐noise ratio (SNR) across the patient population. The coil housing is designed to facilitate patient positioning and comfort, while also being tight fitting to ensure high sensitivity. We demonstrate RF shimming capabilities to optimize B1+uniformity, power efficiency, and/or specific absorption rate efficiency. B1+homogeneity, SNR, and g‐factor were evaluated in adult volunteers and demonstrated excellent performance from the occipital lobe down to the T4‐T5 level. We compared the proposed coil with two state‐of‐the‐art head and head/neck coils, confirming its superiority in the cervical and upper thoracic regions of the spinal cord. This coil solution therefore provides a convincing platform for producing the high image quality necessary for clinical and research scanning of the upper spinal cord.