Joint Sparse Representation of Brain Activity Patterns in Multi-Task fMRI Data 2015/03/21.
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Transcript of Joint Sparse Representation of Brain Activity Patterns in Multi-Task fMRI Data 2015/03/21.
Concepts
fMRI(functional magnetic resonance imaging)BOLD(blood oxygenation-level dependent) NoninvasiveSpatial resolution: mmTime resolution: about 1 second
Concepts
Data of fMRIField of view: 64*64Slices: 32acquisition time: 2s images: hundreds
TypeRestTask
Steps for SPM
1. Slice timing
2. Realignment
3. coregister
4. Segment
5. normalise
6. Smooth
7. Specify 1st-level
Problem
Multi-taskCapitalize on the joint information that may
exist among tasks.The joint information is not usually directly
examined.
Data fusion
Idea
This would result in a set of dictionaries and sparse coefficients. To obtain the joint relation of the results we would need to combine the sparse coefficients.
Simulation
A total of 20 simulated datasets that represent two groups of subjects, each with 10 datasets.