Hello,
I am emailing to inquire about whether poor grey/white contrast in one part of a scan (i.e., the posterior and superior part of the scan; ~parietal cortex) can be addressed. The contrast in other parts of the scan looks good and freesurfer does a great job of distinguishing white from grey. For the parietal cortex area the cortex appears very thin. In addition, the entire brain appears 'white' or bright, even though the brain doesn't look this bright if you reconstruct it from dicoms.
We have now obtained 4 scans like this, so it isn't just one person with thinning cortex.
How can I make an adjustment to only this superior part of the brain and leave the rest of it alone? Or do I need to make an adjustment to the intensity early on for the entire scan and then basically start over with editing?
Best, Christine
Some pictures would probably be helpful to know what the issue is.
Peace,
Matt.
From: Christine Smith cnsmith@ucsd.edu Date: Thursday, January 23, 2014 1:05 PM To: freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] poor grey/white distinction in superior part of scan
Hello,
I am emailing to inquire about whether poor grey/white contrast in one part of a scan (i.e., the posterior and superior part of the scan; ~parietal cortex) can be addressed. The contrast in other parts of the scan looks good and freesurfer does a great job of distinguishing white from grey. For the parietal cortex area the cortex appears very thin. In addition, the entire brain appears 'white' or bright, even though the brain doesn't look this bright if you reconstruct it from dicoms.
We have now obtained 4 scans like this, so it isn't just one person with thinning cortex.
How can I make an adjustment to only this superior part of the brain and leave the rest of it alone? Or do I need to make an adjustment to the intensity early on for the entire scan and then basically start over with editing?
Best, Christine
freesurfer@nmr.mgh.harvard.edu
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Christine Smith -
Matt Glasser