Negishi Michiro, Pinus Boris I, Pinus Alexander B, Constable R Todd
Department of Diagnostic Radiology, School of Medicine, Yale University, New Haven, CT 06520-8043, USA.
IEEE Trans Biomed Eng. 2007 Sep;54(9):1725-7. doi: 10.1109/TBME.2007.891940.
Simultaneous electroencephalograph-functional magnetic resonance imaging (EEG-fMRI) recording has become an important tool for investigating spatiotemporal properties of brain events, such as epilepsy, evoked brain responses, and changes in brain rhythms. Reduction of noise in EEG signals during fMRI recording is crucial for acquiring high-quality EEG-fMRI data. The main source of the noise includes the gradient artifact, the radio frequency (RF) pulse artifact, and the cardiac pulse artifact. Since the RF pulse artifact is relatively small in amplitude, little attention has been paid to this artifact, and its origin is not well understood. However, the amplitude of the RF pulse artifact fluctuates randomly even if a very high EEG sampling rate is used, making it more salient than the gradient artifact after postprocessing for noise removal. In this paper, we investigate the cause of the RF pulse artifact in EEG systems that use carbon wires.
同步脑电图-功能磁共振成像（EEG-fMRI）记录已成为研究大脑事件时空特性的重要工具，这些大脑事件包括癫痫、诱发脑反应和脑节律变化。在功能磁共振成像记录期间降低脑电图信号中的噪声对于获取高质量的EEG-fMRI数据至关重要。噪声的主要来源包括梯度伪影、射频（RF）脉冲伪影和心脏脉冲伪影。由于射频脉冲伪影的幅度相对较小，人们对该伪影关注较少，其起源也尚未得到很好的理解。然而，即使使用非常高的脑电图采样率，射频脉冲伪影的幅度仍会随机波动，这使得它在经过去噪后处理后比梯度伪影更明显。在本文中，我们研究了使用碳丝的脑电图系统中射频脉冲伪影的成因。
