Optically controlled on-coil amplifier with RF monitoring feedback.
Optically controlled on-coil amplifier with RF monitoring feedback.
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DOI：
10.1002/mrm.26916
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发表时间：
2018-05
影响因子：
3.3
通讯作者：
Duyn JH
中科院分区：
文献类型：
--
作者：
Gudino N;de Zwart JA;Duan Q;Dodd SJ;Murphy-Boesch J;van Gelderen P;Duyn JH
开发一种新的光控线圈上放大器，通过实时监测信号相位和幅度，促进多通道射频传输在磁共振成像中的安全使用。监测采用4通道原型系统，通过传感、下采样、数字化和光学传输将射频发射信号传输到远程PC来控制放大器。通过台式和7T磁共振成像实验进行性能评估。监测的幅度和相位重复稳定，标准偏差分别为0.061μT和0.0073 rad。反馈系统允许在两次迭代内调整通道间相位和B1幅度。核磁共振实验证明了该方法在高场下进行安全、准确的多通道射频传输和监测的可行性。我们展示了一种基于光控线圈上放大器的4通道收发系统，具有射频信号监测和反馈控制功能。这种方法允许安全和精确地控制射频发射场，这是实现高场均匀激励所必需的。
To develop a new optically controlled on-coil amplifier that facilitates safe use of multi-channel RF transmission in MRI by real-time monitoring of signal phase and amplitude. Monitoring was performed with a 4-channel prototype system by sensing, down sampling, digitizing and optically transmitting the RF transmit signal to a remote PC to control the amplifiers. Performance was evaluated with benchtop and 7T MRI experiments. Monitored amplitude and phase were stable across repetitions and had standard deviations of 0.061 μT and 0.0073 rad respectively. The feedback system allowed inter-channel phase and B1 amplitude to be adjusted within two iterations. MRI experiments demonstrated the feasibility of this approach to perform safe and accurate multi-channel RF transmission and monitoring at high field. We demonstrated a 4-channel transceiver system based on optically controlled on-coil amplifiers with RF signal monitoring and feedback control. The approach allows the safe and precise control of RF transmission fields, required to achieve uniform excitation at high field.
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影响因子：
3.3
作者：
Gudino N;Heilman JA;Riffe MJ;Heid O;Vester M;Griswold MA
通讯作者：
Griswold MA
影响因子：
3.3
作者：
Setsompop, Kawin;Alagappan, Vijayanand;Gagoski, Borjan;Witzel, Thomas;Polimeni, Jonathan;Potthast, Andreas;Hebrank, Franz;Fontius, Ulrich;Schmitt, Franz;Wald, Lawrence L.;Adalsteinsson, Elfar
通讯作者：
Adalsteinsson, Elfar
影响因子：
3.3
作者：
Gudino, Natalia;Duan, Qi;Duyn, Jeff H.
通讯作者：
Duyn, Jeff H.
影响因子：
3.3
作者：
de Zwart, JA;Ledden, PJ;Duyn, JH
通讯作者：
Duyn, JH
影响因子：
3.3
作者：
Mao, Weihua;Smith, Michael B.;Collins, Christopher M.
通讯作者：
Collins, Christopher M.