Hi Giuseppe qform and sform are available in the header info of your image file. I suspect that there is some problem in converting your dicom to nifti files whereby this information was not properly created in the header file. I use MRICRON dcm2nii to convert my dicom to nifti image files. Venkat ________________________________ From: FSL - FMRIB's Software Library on behalf of Giuseppe Sent: Mon 4/30/2012 9:38 AM To: [log in to unmask] Subject: [FSL] Fslswapdim-qform/sform Hi FSL users, I have probably a very basic question to ask you about the Fslswapdim command. I tried to change the orientation of the T1 image in order to match the orientation of the diffusion image by using "fslswapdim <my T1> RL PA SI <output name>" but without success because all the time came up this message about the qform and sform: "Cannot use RLAPSI notation for nifti files without either sform or qform set". Where can i find this files or what i have to do to create them? Thanks a lot in advance, Giuseppe =================================== 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 (2010). 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.