Peshkovsky Alexey, Kennan Richard P, Nagel Ronald L, Avdievich Nikolai I
Division of Hematology, Department of Medicine, Albert Einstein College of Medicine, Bronx, NY 10461, USA.
Magn Reson Imaging. 2006 Jan;24(1):81-7. doi: 10.1016/j.mri.2004.08.026. Epub 2005 Dec 19.
An actively detunable planar quadrature surface coil for human body imaging at 4 T has been constructed and compared with a conventional linear surface coil. The coil could be used as a transmit/receive or a receive-only device in combination with a volume transmit coil. Transmission, reception profiles and the corresponding images acquired with each coil, as well as with both individual modes of the quadrature coil, are presented. Data collected using a tissue equivalent loaded phantom recorded with the linear surface coil demonstrated significant intensity distortions due to RF penetration artifact. The quadrature surface coil, on the other hand, provided compensation of the artifact, separately in its transmission and reception profiles as well as in the resultant images. Substantial sensitivity gain was also observed for the quadrature coil compared to the linear device. Significant advantages of using the quadrature surface coil over the linear device at 4 T have, therefore, been demonstrated.
已构建了一种用于4T人体成像的可主动调谐平面正交表面线圈，并将其与传统线性表面线圈进行了比较。该线圈可与容积发射线圈结合用作发射/接收或仅接收设备。展示了每个线圈以及正交线圈的两种单独模式所采集的发射、接收剖面图和相应图像。使用线性表面线圈记录的组织等效负载体模收集的数据显示，由于射频穿透伪影，存在明显的强度失真。另一方面，正交表面线圈在其发射和接收剖面图以及所得图像中分别提供了伪影补偿。与线性设备相比，正交线圈还观察到了显著的灵敏度增益。因此，已证明在4T时使用正交表面线圈比线性设备具有显著优势。
