Jung Kwan-Jin, Prasad Parikshit, Qin Yulin, Anderson John R
Brain Imaging Research Center, University of Pittsburgh & Carnegie Mellon University, 3025 East Carson Street, Pittsburgh, PA 15203, USA.
Magn Reson Med. 2005 Mar;53(3):739-44. doi: 10.1002/mrm.20398.
A method to extract the subject's overt verbal response from the obscuring acoustic noise in an fMRI scan is developed by applying active noise cancellation with a conventional MRI microphone. Since the EPI scanning and its accompanying acoustic noise in fMRI are repetitive, the acoustic noise in one time segment was used as a reference noise in suppressing the acoustic noise in subsequent segments. However, the acoustic noise from the scanner was affected by the subject's movements, so the reference noise was adaptively adjusted as the scanner's acoustic properties varied in time. This method was successfully applied to a cognitive fMRI experiment with overt verbal responses.
通过使用传统的MRI麦克风进行有源噪声消除，开发了一种从功能磁共振成像（fMRI）扫描中掩盖的声学噪声中提取受试者公开言语反应的方法。由于fMRI中的回波平面成像（EPI）扫描及其伴随的声学噪声是重复的，因此将一个时间段内的声学噪声用作抑制后续时间段内声学噪声的参考噪声。然而，扫描仪发出的声学噪声会受到受试者运动的影响，因此随着扫描仪声学特性随时间变化，参考噪声会进行自适应调整。该方法已成功应用于具有公开言语反应的认知fMRI实验。
