T1- weighted anatomical, structural image of the whole head in very high detail (mm res); T2- weighted BOLD data functional mapping, coarser detail, multiple images every 2/3 secs
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What scans are typically collected during a study?
Survey (initial image for planning), Reference (calibrates scanner), T1, T2
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fMRI provides 4D images, what are the dimensions?
Volume (3D image made of slices), slices (2D image), Voxel (1-3mm pixels), Time (the repetition time = time takes to collect all slices in a whole volume =2/3 s)
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What is the HRF?
The haemodynamic response function is the predictable BOLD response of a voxel to stim
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What does the HRF look like?
small initial dip, followed by a tall peak, and then a variable post-stimulus undershoot.
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Other cards in this set
Card 2
Front
What scans are typically collected during a study?
Back
Survey (initial image for planning), Reference (calibrates scanner), T1, T2
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