I do not know if I understand correctly your post, but what it seems to be is that you need a software to perform the image analysis of the fMRI studies. If so, you can work with FSL (https://fsl.fmrib.ox.ac.uk/fsl/fslwiki/), it is for free. You will need another tool to convert the dicom files to nifti files, you can use dcm2nii (https://www.nitrc.org/projects/dcm2nii/). There are free, you should be able to download and install them. You should check if you have the sequences in your MRI scanner to perform fMRI studies (ep2d_bold), SIEMENS's engineers may help you with that. FMRI studies are not that simple, in my opinion, there are a lot of things you should take into account in order to obtain a quality studio not only in the acquisition steps but also in the image processing. You should get someone to help you with that, in Miami there is someone who may go there (http://www.fmriconsulting.com/).

Regards,

Juan.