1. Incremental Activation Detection for Real-Time fMRI Series Using Robust Kalman Filter.
- Author
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Liang Li, Bin Yan, Li Tong, Linyuan Wang, and Jianxin Li
- Subjects
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REAL-time computing , *FUNCTIONAL magnetic resonance imaging , *KALMAN filtering , *ROBUST control , *BRAIN physiology - Abstract
Real-time functional magnetic resonance imaging (rt-fMRI) is a technique that enables us to observe human brain activations in real time. However, some unexpected noises that emerged in fMRI data collecting, such as acute swallowing, head moving and human manipulations, will cause much confusion and unrobustness for the activation analysis. In this paper, a new activation detection method for rt-fMRI data is proposed based on robust Kalman filter. The idea is to add a variation to the extended kalman filter to handle the additional sparse measurement noise and a sparse noise termto the measurement update step. Hence, the robust Kalman filter is designed to improve the robustness for the outliers and can be computed separately for each voxel. The algorithmcan compute activation maps on each scan within a repetition time, which meets the requirement for real-time analysis. Experimental results show that this new algorithm can bring out high performance in robustness and in real-time activation detection. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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