title: Incremental activation detection for real-time fMRI series using robust Kalman filter.
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 term to 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 algorithm can 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.
authors: China National Digital Switching System Engineering and Technological Research Center, Zheng Zhou 450002, China.
authors: Liang
authors: L
authors: Li
authors: China National Digital Switching System Engineering and Technological Research Center, Zheng Zhou 450002, China.
authors: Bin
authors: B
authors: Yan
authors: China National Digital Switching System Engineering and Technological Research Center, Zheng Zhou 450002, China.
authors: Li
authors: L
authors: Tong
authors: China National Digital Switching System Engineering and Technological Research Center, Zheng Zhou 450002, China.
authors: Linyuan
authors: L
authors: Wang
authors: China National Digital Switching System Engineering and Technological Research Center, Zheng Zhou 450002, China.
authors: Jianxin
authors: J
authors: Li
mesh_terms: D000465:Algorithms; D016477:Artifacts; D001185:Artificial Intelligence; D001921:Brain / Q000473:pathology* / Q000502:physiology; D001931:Brain Mapping / Q000379:methods*; D003198:Computer Simulation; D006257:Head / Q000502:physiology; D006439:Hemodynamics; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D016013:Likelihood Functions; D008279:Magnetic Resonance Imaging / Q000379:methods*; D009038:Motion; D016011:Normal Distribution; D012984:Software