[Freesurfer] Flipped image talairach correction and missing .dcm extension

-- Hello group I am new to freesurfer. I have two problems. Please accept my apologies if these queries are bit naïve! Any help will be much appreciated. I am trying to autorecon1 a single image obtained from Philips 3T as dicom output. I use MacOS ­ X11 terminal. 1. I am not able to use mri_convert to change these images to .mgz or niftii format. Is this because these files lack .dcm extension? For some reason all these files don¹t have .dcm extension though my radiology colleagues repeatedl assure me that they are dicoms! 2. I obtained some T1 MPRAGEs in img hdr format (no mat files came with them) and I am trying to recon1 this subject. There is a problem with talairach transforms (z ­8) that needs manual correction. But when I try to open the brainmask.mgz on tkmedit for visual inspection I get the following msg Couldn't read the anatomical volume. Tkmedit couldn't read the volume you specified. This could be because the image format wasn't recognized, or it couldn't find the proper header, or the file(s) were unreadable, or it was the wrong size. Nevertheless when I proceed to open the tkregister2 for manual correction, ( without ‹surf orig), I see the moveable image 180* flipped compared to the target image in sagittal view. Could this be due to some error in conversion of dcms? Or is this due to acquisition differences? Please help. Many thanks in advance Lena This message has been checked for viruses but the contents of an attachment may still contain software viruses, which could damage your computer system: you are advised to perform your own checks. Email communications with the University of Nottingham may be monitored as permitted by UK legislation.