Title :
Analysis of "Scanner Ferquency" Noise in Fmri Timeseries
Author :
Li, Shunshan ; Buonocore, Michael H. ; Zhuang, Tiange ; Shi, Jianrong ; Lai, Song
Author_Institution :
Imaging Res. Center, California Univ., Davis, CA
Abstract :
MRI system noise often appears in the fMRI timeseries in phantom and human subjects experiments. The predominant characteristic of this MRI system noise is high amplitude at one or a few specific temporal frequencies. These frequencies are immediately found by FFT analysis, but they have also been identified in ICA methods. This study indicates that these frequencies should be considered in the design of experimental paradigms and temporal digital filters
Keywords :
biomedical MRI; fast Fourier transforms; independent component analysis; noise; time series; FFT analysis; ICA methods; MRI system noise; fMRI time series; phantom; scanner frequency noise; temporal digital filters; temporal frequencies; Biomedical engineering;
Conference_Titel :
Engineering in Medicine and Biology Society, 2005. IEEE-EMBS 2005. 27th Annual International Conference of the
Conference_Location :
Shanghai
Print_ISBN :
0-7803-8741-4
DOI :
10.1109/IEMBS.2005.1615623
