Lagopoulos Jim, Malhi Gin S, Shnier Ronald C
University of New South Wales, Sydney, Australia
Behav Res Methods. 2005 Nov;37(4):657-64. doi: 10.3758/bf03192737.
The acquisition of the skin conductance response (SCR) during functional magnetic resonance imaging (fMRI) raises significant safety issues, as well as practical ones, which need to be addressed in order for these experiments to be conducted safely and successfully. Metallic and conductive wires in the presence of time-varying gradient magnetic fields such as those present in fMRI experiments may induce heating, as well as electric fields, in these components and, if in contact with the subject, could produce severe burns and electric shocks. Moreover, these metallic and conductive components can significantly distort the magnetic field, resulting in image artifacts. A system for recording the SCR in humans simultaneously with fMRI is presented. The device is a fiber-optic-based transducer, which records the SCR from two fingers of the same hand, using electrodes containing inline radio frequency (RF) suppression filters and protective resistive loads. The fiber-optic SCR transducer was tested using 1.5 and 3.0 Tesla MRI scanners running EPI sequences. This system was able to safely record SCRs free of RF interference during an fMRI experiment, and the fiber-optic design of the transducer eliminated any artifacts on the MRI scan.
在功能磁共振成像（fMRI）过程中获取皮肤电导反应（SCR）会引发重大安全问题以及实际问题，为了安全且成功地进行这些实验，需要解决这些问题。在fMRI实验中存在的随时间变化的梯度磁场环境下，金属和导线可能会在这些部件中产生发热以及电场，并且如果与受试者接触，可能会导致严重烧伤和电击。此外，这些金属和导电部件会显著扭曲磁场，导致图像伪影。本文介绍了一种能在人类进行fMRI的同时记录SCR的系统。该设备是一种基于光纤的传感器，它使用包含内置射频（RF）抑制滤波器和保护性电阻负载的电极，从同一只手的两个手指记录SCR。使用运行EPI序列的1.5特斯拉和3.0特斯拉MRI扫描仪对光纤SCR传感器进行了测试。该系统能够在fMRI实验期间安全地记录无RF干扰的SCR，并且传感器的光纤设计消除了MRI扫描上的任何伪影。
