I have one DTI dataset, and I've applied two different reconstruction algorithms to it. Thus there were two datasets with the same anatomical structure but varying in sth like the artifacts and SNR. I want to generate their FA maps. I use EDDY and DITFIT from FSL. I find that the results of eddy correction are different. That is, the transformations of two datasets are not the same, and the shape of the corrected images are also different.

eddy_parameters is one of the output files of EDDY. It contains the parameters of the transformation. How can I apply the eddy_parameters of one dataset to the other to ensure the same correction results?

The eddy_parameters file contains a matrix with a size of 21*16. There are 21 volumes in the DTI dataset, which means there are 16 parameters of transformation for each volume. But I don't know what each parameter exactly means? Does anyone have experience in this?

Thank you very much!