Negative or Null Limit Value on T1 Bias Correction

Questions about BrainVisa usage and installation

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thornpyros
Posts: 3
Joined: Sat Mar 31, 2012 1:28 pm

Negative or Null Limit Value on T1 Bias Correction

Post by thornpyros »

Hello everyone.

I tried lots of things such as changing parameters [field regularity etc.], installation older version of BV, other MR images... but I could not solve the problem.

Whenever I use Morphologist 2012 on my dataset, I got lots of errors. First error is "VIP Error: Negative or Null Limit Value!" on T1 Bias Correction step. After that, program is stopped on Split Brain Mask step. I also checked result of previous step which is Compute Brain Mask. Brain mask seems OK.

I created a synthetic MRI to try Morphologist 2012 and It works! But on my dataset, no real MRI data are working correctly.

Could you please someone try this image below.

The image can be downloaded here: http://dl.dropbox.com/u/3482709/yil.zip
Note: It needs to be rotated first. By the way, I use SPM8 for Normalization step.
Dominique Geffroy
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Re: Negative or Null Limit Value on T1 Bias Correction

Post by Dominique Geffroy »

Hello,

The image resolution seems very bad along the z axis and the contrast seems very low. Maybe the quality of the image is no sufficient enough to get a correct segmentation...

Dominique
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