An RF-gated wireless power transfer system for wireless MRI receive arrays.
An RF-gated wireless power transfer system for wireless MRI receive arrays.
复制标题
DOI：
10.1002/cmr.b.21360
复制
发表时间：
2017-10
期刊：
影响因子：
--
通讯作者：
K. Byron;F. Robb;P. Stang;S. Vasanawala;J. Pauly;G. Scott
中科院分区：
文献类型：
--
作者：
K. Byron;F. Robb;P. Stang;S. Vasanawala;J. Pauly;G. Scott
在MRI系统中，无电缆接收阵列将简化设置，同时减少线圈阵列的体积和重量，并提高患者舒适度和吞吐量。由于电池电源会限制扫描时间，因此无线功率传输（WPT）是一种可行的选择，可以持续向线圈上的电子器件提供数瓦的功率。为了最小化增加的噪声并将无线电力系统与MRI线圈解耦，对无线电力系统的线圈几何形状进行限制，这被示出为限制其效率。连续的功率收集还可能由于二极管整流器对发射功率的频率周围的噪声进行上变频而导致图像的背景噪声的大幅增加。然而，通过在MRI接收时间期间RF门控发射功率关闭，同时继续从存储电容器供电，WPT被证明在高达11 W的接收功率水平下对图像质量的影响最小。展示了WPT与1.5T扫描仪的集成。
In MRI systems, cable-free receive arrays would simplify setup while reducing the bulk and weight of coil arrays and improve patient comfort and throughput. Since battery power would limit scan time, wireless power transfer (WPT) is a viable option to continuously supply several watts of power to on-coil electronics. To minimize added noise and decouple the wireless power system from MRI coils, restrictions are placed on the coil geometry of the wireless power system, which are shown to limit its efficiency. Continuous power harvesting can also cause a large increase in the background noise of the image due to diode rectifier up-conversion of noise around the frequency of the transmitted power. However, by RF gating the transmitted power off during the MRI receive time while continuing to supply power from a storage capacitor, WPT is demonstrated to have minimal impact on image quality at received power levels up to 11 W. The integration of WPT with a 1.5T scanner is demonstrated.