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I've never used rex.m, but different centrers can give you different ROI voxel counts. It depends on where the center is relative to the voxel center and also your voxel size. Best Regards, Donald McLaren ================= D.G. McLaren, Ph.D. Research Fellow, Department of Neurology, Massachusetts General Hospital and Harvard Medical School Postdoctoral Research Fellow, GRECC, Bedford VA Website: http://www.martinos.org/~mclaren Office: (773) 406-2464 ===================== This e-mail contains CONFIDENTIAL INFORMATION which may contain PROTECTED HEALTHCARE INFORMATION and may also be LEGALLY PRIVILEGED and which is intended only for the use of the individual or entity named above. If the reader of the e-mail is not the intended recipient or the employee or agent responsible for delivering it to the intended recipient, you are hereby notified that you are in possession of confidential and privileged information. Any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited and may be unlawful. If you have received this e-mail unintentionally, please immediately notify the sender via telephone at (773) 406-2464 or email. On Wed, Jun 18, 2014 at 6:25 AM, Dhananjay kimothi < [log in to unmask]> wrote: > Dear All, > > I used Marsbar to create box ROI's centred at different coordinates ex. > -44 14 52, 39,12,14 and so on as centre and 12 12 12 mm as the box > size and exported to MNI template . > and i am using rex.m file for analysing it,the number of voxels in > different ROI's i.e. with different centres but same size is giving me > different count.... > > Is it possible??or I am missing something > > > > Dhananjay Kimothi > >