Experimental analysis of parallel excitation using dedicated coil setups and simultaneous RF transmission on multiple channels
Experimental analysis of parallel excitation using dedicated coil setups and simultaneous RF transmission on multiple channels
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DOI：
10.1002/mrm.20646
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发表时间：
2005-10-01
影响因子：
3.3
通讯作者：
Hennig, J
中科院分区：
文献类型：
--
作者：
Ullmann, P;Junge, S;Hennig, J
提出了使用发射线圈阵列进行并行空间选择性激励以及在多个通道上同时传输单个波形的实验实现和首次性能分析。该技术也称为 Transmit SENSE，利用并行成像的基本思想来缩短伴随多维激励脉冲的 k 空间轨迹，从而缩短此类脉冲的持续时间。到目前为止，这个概念仅在模拟和半实验研究中提出，因为还没有可用于完整实验实现的硬件设置。在本研究中，提出了一种与专用线圈设置相结合的硬件解决方案来克服这一限制，并且在局部激励和发射场不均匀性补偿的多个实验中，证明了 Transmit SENSE 的实际可行性，并给出了首次性能分析。
An experimental implementation and first performance analysis of parallel spatially selective excitation with an array of transmit coils and simultaneous transmission of individual waveforms on multiple channels is presented. This technique, also known as Transmit SENSE, uses the basic idea of parallel imaging to shorten the k-space trajectories that accompany multidimensional excitation pulses, and hence shorten the duration of such pulses. So far, this concept has only been presented in simulations and semi-experimental studies since no hardware setup had been available for a full experimental realization. In this study, a hardware solution, in combination with a dedicated coil setup, is presented to overcome this limitation, and in several experiments of localized excitation and transmit field inhomogeneity compensation the practical feasibility of Transmit SENSE is demonstrated and a first performance analysis is given.