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-bounces@nmr.mgh.harvard.edu on behalf of "Renner, Brian" Brian.Renner@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
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Brian Renner, MD Research Associate, Neurology brian.renner@cshs.orgmailto:brian.renner@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.orghttps://www.cedars-sinai.org/
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