Aussenhofer S A, Webb A G
C.J. Gorter Center for High Field MRI, Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands.
C.J. Gorter Center for High Field MRI, Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands.
J Magn Reson. 2014 Jun;243:122-9. doi: 10.1016/j.jmr.2014.04.001. Epub 2014 Apr 18.
This study describes the design, construction and operation of a new type of transmit/receive array using ceramic resonators operating in a transverse electromagnetic (TE) mode. Single element function and performance at 298.1MHz (7T) are analyzed and compared to a lumped element design loop coil with comparable geometry. The results show that ceramic resonators working in the TE01δ mode configuration produce similar efficiency, defined as the transmit magnetic field (B1(+)) per square root of the specific absorption rate (SAR), to conventional surface coils. An array consisting of eight ceramic elements was then designed to operate in transmit/receive mode. This array was driven via power/phase splitters by two independent transmit channels and functional cardiac images were produced from a number of healthy volunteers.
本研究描述了一种新型发射/接收阵列的设计、构建和操作，该阵列使用工作在横向电磁（TE）模式下的陶瓷谐振器。分析了单个元件在298.1MHz（7T）时的功能和性能，并与具有可比几何形状的集总元件设计环形线圈进行了比较。结果表明，工作在TE01δ模式配置下的陶瓷谐振器产生的效率与传统表面线圈相似，效率定义为比吸收率（SAR）的平方根对应的发射磁场（B1(+)）。然后设计了一个由八个陶瓷元件组成的阵列，使其工作在发射/接收模式。该阵列由两个独立的发射通道通过功率/相位分配器驱动，并从多名健康志愿者身上获取了功能性心脏图像。
