Feng Yuan, Zhu Mo, Qiu Suhao, Shen Ping, Ma Shengyuan, Zhao Xuefeng, Hu Chun-Hong, Guo Liang
Institute for Medical Imaging Technology, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Center for Molecular Imaging and Nuclear Medicine, School of Radiological and Interdisciplinary Sciences (RAD-X), Soochow University, Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Suzhou, Jiangsu 215123, China.
Department of Radiology, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou 215006, China.
Magn Reson Imaging. 2018 Sep;51:29-34. doi: 10.1016/j.mri.2018.04.008. Epub 2018 Apr 19.
An electromagnetic actuator was designed for magnetic resonance elastography (MRE). The actuator is unique in that it is simple, portable, and capable of brain, abdomen, and phantom imagings. A custom-built control unit was used for controlling the vibration frequency and synchronizing the trigger signals. An actuation unit was built and mounted on the specifically designed clamp and holders for different imaging applications. MRE experiments with respect to gel phantoms, brain, and liver showed that the actuator could produce stable and consistent mechanical waves. Estimated shear modulus using local frequency estimate method demonstrated that the measurement results were in line with that from MRE studies using different actuation systems. The relatively easy setup procedure and simple design indicated that the actuator system had the potential to be applied in many different clinical studies.
设计了一种用于磁共振弹性成像（MRE）的电磁致动器。该致动器的独特之处在于其结构简单、便于携带，并且能够用于脑部、腹部和体模成像。使用定制的控制单元来控制振动频率并同步触发信号。构建了一个致动单元，并将其安装在专门设计的夹具和固定器上，以用于不同的成像应用。针对凝胶体模、脑部和肝脏的MRE实验表明，该致动器能够产生稳定且一致的机械波。使用局部频率估计方法估算的剪切模量表明，测量结果与使用不同致动系统的MRE研究结果一致。相对简便的设置过程和简单的设计表明，该致动器系统有潜力应用于许多不同的临床研究。
