治疗设备中时变磁场的磁共振成像。
Magnetic resonance imaging of time-varying magnetic fields from therapeutic devices.
机构信息
FMRI Laboratory, 2360 Bonisteel Blvd., Ann Arbor, MI 48109-2108, USA.
出版信息
NMR Biomed. 2013 Jun;26(6):718-24. doi: 10.1002/nbm.2919. Epub 2013 Jan 28.
Abstract
While magnetic resonance imaging of static magnetic fields generated by external probes has been previously demonstrated, there is an unmet need to image time-varying magnetic fields such as those generated by transcranial magnetic stimulators and radiofrequency hyperthermia probes. A method to image such time-varying magnetic fields is introduced in this study. This article presents the theory behind the method and provides proof of concept by imaging time-varying magnetic fields generated by a figure-eight coil inside simple phantoms over a range of frequencies and intensities using a 7T small animal MRI scanner. The method was able to reconstruct the three-dimensional components of the oscillating magnetic field vector.
摘要
虽然已经有研究证明了外部探头产生的静态磁场的磁共振成像，但对于成像诸如经颅磁刺激器和射频热疗探头产生的时变磁场仍存在未满足的需求。本研究介绍了一种用于成像此类时变磁场的方法。本文介绍了该方法的原理，并通过使用 7T 小动物 MRI 扫描仪在一系列频率和强度下对简单体模内的八字形线圈产生的时变磁场进行成像，提供了该方法的概念验证。该方法能够重建振荡磁场矢量的三维分量。
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