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• Technical Article •
Discussion of EPI-fMRI artifacts based on the cases: Causes and solutions
ZHU Li-tao  WU Hui  ZHU Chao-zhe 

DOI:10.3969/j.issn.1674-8034.2012.02.011.


[Abstract] Functional magnetic resonance imaging (fMRI) based on echo planar image (EPI) sequence is the major tool in basic and clinical brain function research. However, compared with the routine imaging sequence, EPI is much easier to suffer from the noises and artifacts, which affects the quality of fMRI data. So how to detect and resolve the artifacts and stability problem of EPI has become a core issue of fMRI quality control for research. In this paper, five types of fMRI artifacts are summarized and reviewed, which often occur in the application of fMRI based on authors’ 5 years experience of fMRI quality control. They are the Nyquist ghost, geometric distortion, spike noise, RF noise and stability problems in the time course. The selected cases, found in fMRI quality control process, are adopted for each type of artifact for further analysis including its feature, major causes and trouble shooting guideline. We expect that these cases and their detailed analysis can be good references for the researchers and technicians to assure the quality of their fMRI data.
[Keywords] Functional magnetic resonance imaging；Echo planar image；Artifact；Ghost；Quality Control

ZHU Li-tao National Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University, Beijing 100875, China

WU Hui National Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University, Beijing 100875, China

ZHU Chao-zhe * National Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University, Beijing 100875, China

*Correspondence to: Zhu CZ, E-mail: czzhu@bnu.edu.cn

Conflicts of interest   None.

Received  2011-12-15
Accepted  2012-02-22
DOI: 10.3969/j.issn.1674-8034.2012.02.011
DOI:10.3969/j.issn.1674-8034.2012.02.011.

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