In my experience, none of the quantitative "SNR/CNR" metrics available through various FS tools (some of which may be part of the QATools) replace the need to manually inspect the results. Some truly awful data may show up as "outliers", but you can't count on those values to flag all the data with problems.
cheers, -MH -- Michael Harms, Ph.D. ----------------------------------------------------------- Conte Center for the Neuroscience of Mental Disorders Washington University School of Medicine Department of Psychiatry, Box 8134 660 South Euclid Ave.Tel: 314-747-6173 St. Louis, MO 63110Email: mha...@wustl.edu On 11/23/15 11:16 AM, "angela.fav...@unipd.it" <angela.fav...@unipd.it> wrote: Hi all, I am starting to use QAtools in Freesurfer. The scripts are working well, but I have two problems: 1. the interpretation of output is the first. Are there ranges of normality for SNR and intensity? Could you please give me some reference or link about how to interpret these data? Or do I only need to look at outliers (or something similar)? My values are in the range between 19 and 25 (and the subject with 19 have problems at visual inspection). The script also outputs 'no outlier' in all my subjects. Which type of outliers is it referring to? 2. I have also problems in getting snapshots, but I think this is due to my poor experience with setting paths of ImageMagick. I am using a MAC OSX 10.6.8 and I used (tcsh) setenv MAGICK_HOME /Applications/ImageMagick-6.9.2/bin but probably this is not enough (any suggestion is greatly apreciated). Thank you for any help you can give me Best wishes Angela _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail. ________________________________ The materials in this message are private and may contain Protected Healthcare Information or other information of a sensitive nature. If you are not the intended recipient, be advised that any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this email in error, please immediately notify the sender via telephone or return mail. _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
