Development of Compact Ultra-Low-Field MRI System Using an Induction Coil
Development of Compact Ultra-Low-Field MRI System Using an Induction Coil
复制标题
使用感应线圈开发紧凑型超低场 MRI 系统
DOI：
10.1109/tmag.2017.2709340
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发表时间：
2017
影响因子：
2.1
通讯作者：
and Gen Uehara
中科院分区：
文献类型：
--
作者：
Daisuke Oyama;Yoshiaki Adachi;Masanori Higuchi;Naohiro Tsuyuguchi;and Gen Uehara
超低场磁共振成像 (ULF-MRI) 对于脑磁图 (MEG) 和 MRI 并行系统等 MRI 应用很有吸引力。我们正在开发一种紧凑型 ULF-MRI 系统，可以与小动物 MEG 系统结合使用。在本文中，我们开发了一种使用感应线圈代替超导量子干涉装置的 ULF-MRI 检测方法。感应线圈具有更坚固、易于操作、设计灵活等优点。我们用尺寸为 29 毫米 x 39 毫米 x 29 毫米（内径 x 外径 x 长度）的铜线制造感应线圈。连接电容器以通过 LC 谐振效应提高灵敏度。共振频率为3 kHz，MRI测量对应的磁场密度为70 μT。检测线圈与紧凑型 ULF-MRI 系统集成，并放置在磁屏蔽盒内。 MRI 测量通过使用总体积为 5.5 x 103mm3 的水模型进行演示。获得的图像的尺寸为32×32像素(30.2mm×30.2mm)。使用该 ULF-MRI 系统拍摄了清晰的水体模型。该结果表明感应线圈可用于紧凑型 ULF-MRI 系统。
Ultra-low-field magnetic resonance imaging (ULF-MRI) is attractive for MRI applications such as a concurrent system of magnetoencephalography (MEG) and MRI. We are developing a compact ULF-MRI system that can be combined with a small-animal MEG system. In this paper, we developed a detection method that uses an induction coil instead of a superconducting quantum interference device for the ULF-MRI. The induction coil has advantages such as being more robust, easy to handle, and flexible for designing. We fabricated an induction coil from a copper wire with dimensions of 29 mm x 39 mm x 29 mm (inner diameter x outer diameter x length). A capacitor was connected to increase the sensitivity by the LC resonance effect. The resonance frequency was 3 kHz, and the corresponding magnetic field density for MRI measurement was 70 μT. The detection coil was integrated with the compact ULF-MRI system and placed inside a magnetically shielded box. MRI measurement was demonstrated by using water phantoms with a total volume of 5.5 x 103mm3. The size of the obtained image was 32 x 32 pixels for 30.2 mm x 30.2 mm. A clear shape of the water phantom was taken with this ULF-MRI system. This result shows the induction coil can be used for the compact ULF-MRI system.