Hi Ivana,
as Torben already pointed out, the MP2RAGE sequence itself strongly minimizes the bias field. Hence, you should use strong bias regularisation values in SPM. It is a little bit counterintuitive, BUT strong bias regularisation should be used when there are little intensity inhomogeneities in your data. This is the case when you are using the MP2RAGE sequence. By using such values you tell the algorithm that you have already accounted for the bias field (MP2RAGE) and it further tries not to model it (see help section in batch editor).
Best,
René
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