Laboratory for Social and Neural Systems Research (SNS Lab), University of Zurich, Zurich, Switzerland.
Institute for Biomedical Engineering, ETH Zurich and University of Zurich, Zurich, Switzerland.
Magn Reson Med. 2025 Feb;93(2):889-898. doi: 10.1002/mrm.30314. Epub 2024 Sep 29.
Customizing a Siemens 32-channel coil for use in a Philips 3T MRI system with incorporated magnetic field probes for collecting high-quality MRI and magnetic-field monitoring data concurrently.
The development process of the custom coil involved several (iterative) phases. Standard temporal SNR and B data were collected with the 32-channel Siemens and for reference the 32-channel/8-channel Philips head coils before and after the custom coil was made compatible with the 3T Philips Achieva system, and magnetic field probes were installed into it along with ancillary electronics around it. Quality assurance tests were conducted in each of the build phases to ensure that the modifications did not affect MRI or field-monitoring data negatively. To test the finished custom coil, we collected high angular resolution diffusion imaging (HARDI) datasets on a spherical silicon oil phantom both with and without concurrent field monitoring and a 32-channel Philips coil without concurrent field monitoring, where the latter two served as reference scans to assess the improved performance of the custom coil with field monitoring. Similar HARDI-MRI data were also collected in vivo with the finished custom coil together with field monitoring data.
The custom coil provided excellent temporal SNR especially at the edges where cortical gray matter is expected. When using concurrent field monitoring in HARDI acquisitions, the custom coil alleviated ghosting artifacts in phantom data and provided in vivo images with 1.4-mm isotropic resolution.
The custom MRI coil with integrated magnetic-field monitoring probes provided improved imaging performance.
为了在飞利浦 3T MRI 系统中使用西门子 32 通道线圈，同时收集高质量的 MRI 和磁场监测数据，我们对其进行了定制。
定制线圈的开发过程涉及多个（迭代）阶段。在制作兼容飞利浦 Achieva 3T 系统的定制线圈之前和之后，我们使用 32 通道西门子和 32 通道/8 通道飞利浦头部线圈分别采集标准的时间 SNR 和 B 数据，作为参考。此外，我们还将磁场探头安装到线圈中，并在其周围安装辅助电子设备。在每个构建阶段都进行了质量保证测试，以确保修改不会对 MRI 或磁场监测数据产生负面影响。为了测试完成的定制线圈，我们在一个球形硅油体模上同时采集了具有和不具有同时磁场监测的高角分辨率扩散成像（HARDI）数据集，以及不具有同时磁场监测的 32 通道飞利浦线圈的数据集，后两者作为参考扫描，以评估具有磁场监测的定制线圈的性能。我们还使用完成的定制线圈与磁场监测数据一起在体内采集了类似的 HARDI-MRI 数据。
定制线圈提供了出色的时间 SNR，特别是在预期皮质灰质的边缘处。当在 HARDI 采集过程中使用同时的磁场监测时，定制线圈减轻了体模数据中的鬼影伪影，并提供了具有 1.4-mm 各向同性分辨率的体内图像。
带有集成磁场监测探头的定制 MRI 线圈提供了更好的成像性能。
