How to determine smoothing kernel?

 In the smooth section, we can change FWHM. How to determine this value? Is it related to voxel volume?
Also, How to calculate voxel volume?
Please help me!!!

 Yes. The kernal size is dependent on the voxel size. However, most researchers choose a kernal size of 4-8 mm. For EPI data, the voxel size after spatial normalization is usually set to 3*3*3 mm3. 

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