Stroboscopic artifact in digital video-EEG.
Stroboscopic artifact in digital video-EEG.
复制标题
数字视频脑电图中的频闪伪影。
DOI：
10.1097/00004691-200403000-00003
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
Taft,William
中科院分区：
文献类型：
--
作者：
Quigg,Mark;Taft,William
组合数字视频脑电图（DV-EEG）系统消除了许多熟悉的旧模拟记录器的技术文物，但是，新的和意想不到的技术问题变得明显。在本报告中，描述了一个案例，确定了这些技术限制之一，可能是一个陷阱，以准确的数据解释。记录了一名18岁男性的EEG，该男性有光敏感性全身强直阵挛性癫痫发作病史，显示光阵发性反应似乎持续时间超过光刺激。然而，在尝试视频-EEG相关性时，数字视频记录显示与EEG光刻度标记不相关的光突发的可变外观或不存在，最初表明视频和EEG信号之间的去同步化。然而，在视频记录上没有看到闪烁是由于频闪频率、视频采样率和视频显示特性之间的不匹配引起的频闪伪影。频闪混叠是一种DV-EEG特定伪影，可能使光阵发性反应的准确解释复杂化。
Combined digital video-EEG (DV-EEG) systems eliminate many familiar technical artifacts of older analog recorders; however, new and unanticipated technical issues are becoming evident. In this report, a case is described that identifies one of these technical limitations that could represent a pitfall to accurate data interpretation. An EEG was recorded on an 18-year-old man with history of photically sensitive generalized tonic-clonic seizures, revealing photoparoxysmal responses that appeared to outlast photic stimulation. However, in an attempted video-EEG correlation, the digital video recording showed variable appearance or absence of photic bursts that did not correlate with EEG photic tick marks, initially suggesting desynchronization between video and EEG signals. However, the absence of flashes seen on the video record resulted from stroboscopic artifact caused by mismatch between strobe frequency, video sampling rate, and video display characteristics. Stroboscopic aliasing is a DV-EEG specific artifact that can complicate accurate interpretation of photoparoxysmal responses.