How does MELODIC calculate the number of Independent Components (ICs)?
The number of components is calculated using Bayesian dimensionality estimation techniques, as detailed in the FMRIB technical report TR02CB1. Refer to this report for full details on this and other aspects of the probabilistic ICA method used in MELODIC. This dimensionality estimation is used by default in both the command line and GUI versions. It can be turned off and the number of components specified manually, although this is not recommended for FMRI data. BET • BET does not give me good results – what can I do? Firstly, check that the input image is OK. This can be done using slices as described in the first part of the flirt checklist. If the image contains a lot of neck (large superior-inferior FOV), then the default centre used by BET is often poor. This can be fixed by using the -c option to select good centre coordinates. Note that these coordinates are in voxels, not mm, so if you are using voxel coordinates (starting at 0 in the corner) then you must multiply these coordi
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