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Jason, Could you send me the VOI and first level mask, I'll have a look and see what might be happening. I'm wondering if there was an interpolation issue when you did the multiplication. I generally use the group level mask to ensure that I can use the same VOI in all subjects. Using the first-level mask would also work, but requires a slightly different VOI in each subject. 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 Tue, Oct 29, 2013 at 12:45 PM, Jason Ozubko < [log in to unmask]> wrote: > Hello, > > I am trying to setup an analysis in gPPI and I'm running into some trouble > with the VOI size. The manual does explain how one might fix such a > problem, but I don't think I understand the manual because I thought I did > what it recommended but the analysis still doesn't work. > > The error I'm receiving is "VOI is larger than dataset". The manual said > to multiply your VOI by the first level mask, and so I believe I've done > that because I have a new VOI mask which is now the same dimensions as my > dataset (both are 40x48x34) but I'm getting the same error message. Have I > misunderstood things? And regardless, how can I fix this issue? > > Thanks in advance to anyone who can help! > > Cheers, > Jason >