Dear Atef,
By all means I am not an expert, but I suggest you get acquainted with FSL-FIRST. It is possible to get hippocalmal volumes with the use of this software. You can get either hippocampal volues alone (option -s R_Hipp,L_Hipp in run_first_all) or volumes of all structures segmented by FSL-FIRST (hippocampi included).
Please, take a look at https://fsl.fmrib.ox.ac.uk/fsl/fslwiki/FIRST/UserGuide
You might be interested in this study as well http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0048895
Best wishes,
Lukasz
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