Search found 62 matches

by houenou
Sat Jan 07, 2006 3:57 pm
Forum: Anatomist
Topic: Automatic segmentation into Brodmann Areas
Replies: 10
Views: 14775

Automatic segmentation into Brodmann Areas

Hello,
Is there a way to get an automatic segmentation of a T1-image with Anatomist ? I mean, a segmentatin of the brain into Brodmann Areas which would define different Brodmann areas as differents ROI ?
Thanks
Josselin HOUENOU
by houenou
Fri Jan 06, 2006 5:43 pm
Forum: BrainVISA
Topic: Warning message in "Diffusion bundles transformation&qu
Replies: 1
Views: 2541

Warning message in "Diffusion bundles transformation&qu

Hi, I get this error message in Brainvisa 3.0.1 (running under Fedora Core 4) when I am splitting bundles with "Diffusion bundles transformation" : "libaimstiff.so.3.0: /home/publicjo/SHFJ_pack-stable-linux-3.0.1/lib/libgcc_s.so.1: version `GCC_3.3' not found (required by /usr/lib/lib...
by houenou
Wed Oct 26, 2005 6:03 pm
Forum: BrainVISA
Topic: question about the interpolation update in 3.0.1
Replies: 1
Views: 2612

question about the interpolation update in 3.0.1

Hi, In the changelog about 3.0.1 version of Brainvisa, you wrote "An error was fixed in linear interpolation of Aims library. This interpolation is used in several algorithms including diffusion and fiber tracking. " So are diffusion results (I mean results get from diffusion tensor and di...
by houenou
Mon Aug 29, 2005 2:09 am
Forum: BrainVISA
Topic: how to resample a bundle ?
Replies: 2
Views: 3306

how to resample a bundle ?

Hi, I would like to resample a .bundle file (to apply a T2=>T1 transformation from a .trm matrix I have and resample it to the T1 image). Is it possible ? What's the command ? Does it need to be resampled to the T1 image or applying the transformation with "Diffusion Bundles Transformation"...
by houenou
Mon Aug 01, 2005 9:50 pm
Forum: BrainVISA
Topic: What does "Resample ROI graph" really do ?
Replies: 2
Views: 3220

What does "Resample ROI graph" really do ?

What does this component do when we only put as input the original ROI graph and the "destination" image ? (I mean, without any transformation matrix). I ask this question because this component give to me the best result I can have to draw a ROI in T2 AC/PC image from a T1 AC/PC image. Th...
by houenou
Sun Jul 31, 2005 8:24 pm
Forum: BrainVISA
Topic: Has thresholding T2 an impact on diffusion analysis process?
Replies: 8
Views: 6163

Hi,
To do what you said : " the thresholded voxels should rather be set to the maximum intensity (32767) ", should I use the "-bg" option of "AimsThreshold" command ?
Josselin
by houenou
Fri Jul 29, 2005 4:01 pm
Forum: BrainVISA
Topic: Has thresholding T2 an impact on diffusion analysis process?
Replies: 8
Views: 6163

I cant' build a mask from a non thresholded because I can't find a good "threshold" value. It eithers keep the whole image or nothing as a mask.
by houenou
Fri Jul 29, 2005 2:23 pm
Forum: BrainVISA
Topic: Has thresholding T2 an impact on diffusion analysis process?
Replies: 8
Views: 6163

Thanks for your reply. I have not yet used the pipelines without thresholding because I cannot build a mask from these images. I will try it.

I use a 1.5 T Signa GE Scanner located at SHFJ, Orsay, France.
by houenou
Thu Jul 28, 2005 10:42 am
Forum: BrainVISA
Topic: Has thresholding T2 an impact on diffusion analysis process?
Replies: 8
Views: 6163

Has thresholding T2 an impact on diffusion analysis process?

Hello, Thanks everyone for you previous answers. Sometimes when I use the "Diffusion to AC/PC referential" on my diffusion and T2 images, I have got a acpc_T2 image with a texture_min at -32768 (usually it is near zero). The problem is that this kind of image is quite "blank" or ...
by houenou
Tue Jul 26, 2005 2:51 pm
Forum: BrainVISA
Topic: how to create ROI in AC/PC T1 and T2 ?
Replies: 2
Views: 3457

how to create ROI in AC/PC T1 and T2 ?

Hello, I am using Brainvisa 3.0 for fiber tracking. I register all my images (T1, T2 and diffusion) in AC/PC referential. To create my T2 and diffusion in AC/PC I use the component named "diffusion to AC/PC referential". To create my T1 in AC/PC I use the component "Apply Transformati...
by houenou
Mon Jul 18, 2005 10:09 pm
Forum: BrainVISA
Topic: Lack of memory for DTI simple tracking ?
Replies: 1
Views: 2611

Lack of memory for DTI simple tracking ?

Hi again, In the DTI simple tracking, I have got sometimes another bug. When I try to set "points per voxel" at 5 for example, or "max_angle" above 45°, I got this error message : "St9bad_alloc " Here is a copy of the log : "Process Fascicles Tracking Pipeline 1 st...
by houenou
Mon Jul 18, 2005 10:05 pm
Forum: BrainVISA
Topic: "Cannot find FA image for thresholding"
Replies: 1
Views: 2687

"Cannot find FA image for thresholding"

Hello, I am using Brainvisa for Windows 3.0 release. In the DTI Simple tracking, when I try to change the "FA_threshold" factor (and set it for example at 0.2) I got this error message "Cannot find FA image for thresholding" : Here is the log : " RuntimeError: Cannot find FA...
by houenou
Tue Jul 12, 2005 8:01 pm
Forum: BrainVISA
Topic: "Could not load DLL libaimsvida.dll.3.0" error mes
Replies: 2
Views: 3203

"Could not load DLL libaimsvida.dll.3.0" error mes

Thanks for publishing the 3.0 Brainvisa version. I am using the 3.0 Windows version. In the diffusion tracking pipeline, I get an error message in the "DTI Simple Tracking", "Diffusion bundles Transformation", "Diffusion bundle analysis" components. This message is : &q...
by houenou
Sun Jul 10, 2005 7:46 pm
Forum: BrainVISA
Topic: What do the"bundles features" statistics describe
Replies: 8
Views: 7005

What do the"bundles features" statistics describe

What do the statistics "Volume Ratio Image" (vr) , "Standard Deviation Image" (stdev) and "Diffusion-weighted T2 image" (dwt2) in the bundles-features statistics mean ?
Thanks
by houenou
Tue Jul 05, 2005 3:17 pm
Forum: BrainVISA
Topic: No "number of fibers" in the "bundle-features
Replies: 3
Views: 3795

Thank you for your answer. What do you mean by "Volume Ratio Image" and "Standard Deviation Image" ? Thanks