Hi Brian,
A couple questions - are you visualizing on a mac retina screen? If so, there
will be a slight decrease from the standard resolution because the underlying
rendering library that we use unfortunately does not support retina
capabilities at this time. Also, are you loading single or multiple volumes?
Freeview uses the first volume loaded as the base image geometry, and all the
following volumes are resampled (if necessary) into this base geometry using
nearest neighbor interpolation. So if you’re working with different-resolution
images, it might help to enable linear interpolation as the default resampling
method by using the `--trilinear` freeview flag. If that’s not the case, it’d
be helpful to see a couple screenshots of the issue.
Hope that helps,
Andrew
From: <freesurfer-boun...@nmr.mgh.harvard.edu> on behalf of "Renner, Brian"
<brian.ren...@cshs.org>
Reply-To: FS Help <freesurfer@nmr.mgh.harvard.edu>
Date: Monday, April 13, 2020 at 8:54 PM
To: FS Help <freesurfer@nmr.mgh.harvard.edu>
Subject: [Freesurfer] Freesurfer display resolution very low compared to other
viewers
External Email - Use Caution
Hello all!
Inaugural message to the list; I will attempt to be brief with the project
description.
The setup is consistent between both versions 6.0.0 and 7.0.0-beta, run on a
high performance cluster, accessed through macOS terminal + Xquartz, most
recent versions all.
As it stands, our group is attempting to do subfield analysis of hippocampal
analysis and lesion measurement in MS subjects. We have noticed that there is a
major discrepancy of resolutions between files, which has irked some of our
physicians undertaking the lesion measurement. We need to resolve the lesions
down to 3mm and have noticed the quality between freeview and fsleyes of the
same nifti files will yield much lower display resolution. This is true for
most scans, though it has been compared using 1mm T2 FLAIR sequences as well as
T2* sequences with 0.65mm voxel space. I have been attempting to find a
workaround as the current solution for the physicians is to look at the files
in fsleyes and then measure them with the ruler tool in freeview. I can send
supporting pictures as necessary.
Thank you in advance for any thoughts you may have!
BR
--
Brian Renner, MD
Research Associate, Neurology
brian.ren...@cshs.org<mailto:brian.ren...@cshs.org>
Cedars-Sinai
127 S. San Vicente Blvd, Suite A6600 : Los Angeles CA 90048
office 310-423-1589 : mobile 310-658-3492 :
cedars-sinai.org<https://www.cedars-sinai.org/>
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