|
|||||
|
|
Evaluation of magnetic resonance imaging issues for implantable microfabricated magnetic actuators |
|
| Authors: | Hyowon Lee Qing Xu Frank G. Shellock Marvin Bergsneider Jack W. Judy |
| Affiliation: | 1. Biomedical Engineering Interdepartmental Program, Department of Electrical Engineering, University of California, 420 Westwood Plaza, Engineering IV 64-144, Los Angeles, CA, 90095, USA 2. Department of Electrical Engineering, University of California, Los Angeles, CA, 90095, USA 3. Department of Radiology and Medicine, National Science Foundation Engineering Research Center, Keck School of Medicine, University of Southern California, Los Angeles, CA, 90089, USA 4. Biomedical Engineering Interdepartmental Program, Department of Neurosurgery, University of California, Los Angeles, CA, 90095, USA 5. Nanoscience Institute for Medical and Engineering Technology, University of Florida, Gainesville, FL, 32611, USA |
| Abstract: | The mechanical robustness of microfabricated torsional magnetic actuators in withstanding the strong static fields (7 T) and time-varying field gradients (17 T/m) produced by an MR system was studied in this investigation. The static and dynamic mechanical characteristics of 30 devices were quantitatively measured before and after exposure to both strong uniform and non-uniform magnetic fields. The results showed no statistically significant change in both the static and dynamic mechanical performance, which mitigate concerns about the mechanical stability of these devices in association with MR systems under the conditions used for this assessment. The MR-induced heating was also measured in a 3-T/128-MHz MR system. The results showed a minimal increase (1.6 °C) in temperature due to the presence of the magnetic microactuator array. Finally, the size of the MR-image artifacts created by the magnetic microdevices were quantified. The signal loss caused by the devices was approximately four times greater than the size of the device. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |