In this contribution we present numerical and experimental results of a parametric quantitative study of radiative dipole antennas in a phased array configuration for efficient body magnetic resonance imaging at 7 T via parallel transmission. For magnetic resonance imaging (MRI) at ultrahigh fields (7 T and higher) dipole antennas are commonly used in phased arrays, particularly for body imaging targets. This study reveals the effects of dipole positioning in the array (elevation of dipoles above the subject and inter-dipole spacing) on their mutual coupling, $B_1^{+}$ per P_acc and $B_1^{+}$ per maximum local SAR efficiencies as well as the RF-shimming capability. The numerical and experimental results are obtained and compared for a homogeneous phantom as well as for a real human models confirmed by in vivo experiments.

在这项贡献中，我们展示了相控阵配置中的辐射偶极子天线的参数定量研究的数值和实验结果，用于通过并行传输在7 T处进行有效的人体磁共振成像。对于超高场（7 T和更高）的磁共振成像（MRI），偶极天线通常用于相控阵中，尤其是对于身体成像目标。这项研究揭示了偶极在阵列中的位置（被摄体上方的偶极高程和偶极间间距）对其相互耦合的影响，${乙}_{\mathrm{1个}}^{+}$每个P _acc和${乙}_{\mathrm{1个}}^{+}$最大本地SAR效率以及RF匀速能力。获得了数值和实验结果，并对同质体模以及通过体内实验确认的真实人体模型进行了比较。