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Thanks Dr.Steve. ________________________________ From: FSL - FMRIB's Software Library on behalf of Steve Smith Sent: Sun 8/30/2009 8:16 AM To: [log in to unmask] Subject: Re: [FSL] Smoothing FSL-VBM On 28 Aug 2009, at 18:15, Rajagopalan, Venkateswaran wrote: > Dear FSL users, > > I am new to VBM kind of analysis. I was going through FSL-VBM user > documentation where it was mentioned that t-statistic map will be > created for a range of FWHM =4.6 to 9 mm and it was suggested that > based on t-stats maps one can decide the size of smoothing kernel > for the data in hand. Can anyone please tell how i can decide i.e. > what to look for in t-stats map which will help me to decide the > appropriate smoothing kernel. Sorry - no, it's not very easy to provide hard rules on this question - that's why I didn't really like the idea of including these multiple smoothings in the script - Gwen's away on holiday so I get away with saying this.... Anyway I generally prefer to stick with the minimal smoothing, and use TFCE, as discussed in the TFCE paper. Cheers. > > In general also i don't know how to choose an appropriate size for > smoothing kernel, i read a little bit about Matched filter theorm to > decide on the selecting the kernel size but couldn't understand much. > > Any help in this regard is greatly appreciated. > > Thanks in advance. > > Regards > venkateswaran > > > =================================== > P Please consider the environment before printing this e-mail > > > > Cleveland Clinic is ranked one of the top hospitals > in America by U.S. News & World Report (2008). > Visit us online at http://www.clevelandclinic.org <http://www.clevelandclinic.org/> for > a complete listing of our services, staff and > locations. > > > Confidentiality Note: This message is intended for use > only by the individual or entity to which it is addressed > and may contain information that is privileged, > confidential, and exempt from disclosure under applicable > law. If the reader of this message is not the intended > recipient or the employee or agent responsible for > delivering the message to the intended recipient, you are > hereby notified that any dissemination, distribution or > copying of this communication is strictly prohibited. If > you have received this communication in error, please > contact the sender immediately and destroy the material in > its entirety, whether electronic or hard copy. Thank you. > --------------------------------------------------------------------------- Stephen M. Smith, Professor of Biomedical Engineering Associate Director, Oxford University FMRIB Centre FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK +44 (0) 1865 222726 (fax 222717) [log in to unmask] http://www.fmrib.ox.ac.uk/~steve --------------------------------------------------------------------------- =================================== P Please consider the environment before printing this e-mail Cleveland Clinic is ranked one of the top hospitals in America by U.S. News & World Report (2008). Visit us online at http://www.clevelandclinic.org for a complete listing of our services, staff and locations. Confidentiality Note: This message is intended for use only by the individual or entity to which it is addressed and may contain information that is privileged, confidential, and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient or the employee or agent responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and destroy the material in its entirety, whether electronic or hard copy. Thank you.