Freesurfer

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30132 discussions

basic comparison
by Jacobs H (NP) 11 Oct '12

11 Oct '12

Hi FreeSurfers, I am preparing a simple presentation, to show some basic stuff in my lab and therefore I would like to compare the cortical thickness of two subjects. Is there a way to do this? For the GLM, I probably have not enough degrees of freedom? Is there a way that I could subtract the two thickness overlays? Thanks Heidi ================================================ Dr. Heidi Jacobs Postdoc researcher Faculty of Health, Medicine and Life Sciences School for Mental Health and Neurosciences Division Cognitive Neuropsychiatry and Clinical Neurosciences Alzheimer Center Limburg h.jacobs(a)maastrichtuniversity.nl www.maastrichtuniversity.nl www.heidijacobs.nl Dr. Tanslaan 12, 6229 ET Maastricht P.O. Box 616, 6200 MD Maastricht, The Netherlands T +31 43 38 84 090 F +31 43 38 84 092 ================================================

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Cognitive Neuroscientist Position, University of Nebraska, Lincoln (fwd)
by Louis Nicholas Vinke 11 Oct '12

11 Oct '12

---------- Forwarded message ---------- Date: Thu, 11 Oct 2012 13:29:03 +0000 From: Nicole Earnest <nearnest2(a)unl.edu> To: "freesurfer-owner(a)nmr.mgh.harvard.edu" <freesurfer-owner(a)nmr.mgh.harvard.edu> Subject: Cognitive Neuroscientist Position, University of Nebraska, Lincoln Please forward the following job ad to your listserv. Thank you. Cognitive Neuroscientist Center for Brain, Biology and Behavior The Center for Brain, Biology and Behavior at the University of Nebraska–Lincoln is recruiting a cognitive neuroscientist with fMRI expertise at the Associate or Full Professor rank. The successful candidate is expected to demonstrate excellence in research including an established record of grant funding. We have preference for candidates who can create and connect to initiatives in traumatic head injury and related areas. The interdisciplinary Center engages a broad spectrum of investigators, including a unique research collaboration with University Athletics, and ishoused within a new 26,000 square foot building. The facility’scenterpiece is a new Skyra 3 Tesla Siemens scanner, as well as 12 high-density EEG/ERP, NIRS and TMS systems. The Skyra is integrated with a 256-electrodehigh-density EEG system and an eye tracker that enable simultaneous recordings. The Center is adjacent to the University’s Holland Computing Center with supercomputer resources and support. The tenure home for the successful candidate will be based on a match between candidate background, preferences and departmental interest. Candidate must have an earned Ph.D. Review of applications will begin December 2, 2012 and continue until the position isfilled. To be considered for the position, please go to http://employment.unl.edu, requisition #120845 and complete the Faculty/Academic Administrative Form. Interested applicants should then submit a letter of application, curriculum vitae, research and teaching statement, pdfs of completed research, and letters of recommendation sent directly from three referees to: Dr. Dennis L. Molfese,Director, The Center for Brain, Biology and Behavior, 238 Burnett Hall, University of Nebraska, Lincoln, NE 68588-0308. Lincoln, Nebraska is a vibrant collegetown of approximately 260,000 that combines the cultural richness of a large university with the affordability of a Midwestern city. The University of Nebraska has an active National Science Foundation ADVANCE gender equity program, and is committed to a pluralistic campus community through affirmative action, equal opportunity, work-life balance, and dual careers. Sincerely, Nikki Nicole Earnest Senior Assistant, Center for Brain, Biology, & Behavior Editorial Assistant-Developmental Neuropsychology University of Nebraska-Lincoln/Psychology Department 324A Burnett Hall Lincoln, NE 68588-0308 Phone: (402)472-0168 Fax: (402)472-4637

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MR Physicist/Scientist Position, University of Nebraska, Lincoln (fwd)
by Louis Nicholas Vinke 11 Oct '12

11 Oct '12

---------- Forwarded message ---------- Date: Thu, 11 Oct 2012 13:28:06 +0000 From: Nicole Earnest <nearnest2(a)unl.edu> To: "freesurfer-owner(a)nmr.mgh.harvard.edu" <freesurfer-owner(a)nmr.mgh.harvard.edu> Subject: MR Physicist/Scientist Position, University of Nebraska, Lincoln Please forward the following job ad to your listserv. Thank you. MR Physicist/Scientist Research Assistant Professor University of Nebraska-Lincoln The University of Nebraska - Lincoln is seeking to hire a MR Physicist/Scientist at the Research Assistant professor level to oversee a new state-of-the-art fMRI facility that includes a new Skyra 3T Siemens fMRI scanner within the Center for Brain, Biology and Behavior at the University of Nebraska, Lincoln. This interdisciplinary Center engages a broad spectrum of investigators and occupies a new 26,000 sq. ft.building. In addition to the Skyra scanner, Center facilities include 12 high-density EEG/ERP and NIRS systems, genetics and endocrine labs, as well as 256-electrode high density EEG/ERP and eye tracker systems integrated with the fMRI that enable simultaneous recordings within test sessions. The Center is adjacent to the University’s Holland Computing Center with supercomputer resources and support. The position will include responsibility for ensuring smooth day-to-day operation of the scanner as well as development of new pulse sequences and hardware to support neuroimaging research conducted on the scanner. The successful candidate will have a Ph.D. in physics, chemistry, biomedical engineering, electrical engineering, or a related field, with at least five years of experience in pulse sequence development, MRI hardware, image reconstruction neuroimaging, or a combination of these fields. Previous experience on Siemens scanners is preferred. The candidate will be expected to develop his or her own successful research and grant-funded programs in neuroimaging, pulse sequence development, image reconstruction, or related academic domains. There will also be opportunities to mentor graduate students and teach courses on MR Physics and other topics of interest to the candidate. In support of these goals, collaboration with Siemens and other research groups/institutions will be encouraged. Compensation is dependent on experience. The successful candidate will be affiliated with an academic department based on a match between candidate background, preferences and departmental interest. Review of applications will begin December 2, 2012 and continue until the position is filled. The start date for this position is July 1, 2013. To be considered for the position, please go to http://employment.unl.edu, requisition #120842 and complete the Faculty/Academic Administrative Form. Interested applicants should then submit a letter of application, curriculum vitae, a research statement, pdfs of completed research papers, and letters of recommendationsent directly from three referees to Dr. Dennis L. Molfese, Director, The Center for Brain, Biology and Behavior, 238 Burnett Hall, University of Nebraska, Lincoln, NE. 68588-0308. Lincoln, Nebraska is a vibrant college town of approximately 260,000 that combines the cultural richness of a large university with the affordability of a Midwestern city. The University of Nebraska has an active National Science Foundation ADVANCE gender equity program, and is committed to a pluralistic campus community through affirmative action, equal opportunity, work-life balance, and dual careers. Inquiries should be sent to Nicole Earnest <nearnest2(a)unl.edu>. Sincerely, Nikki Nicole Earnest Senior Assistant, Center for Brain, Biology, & Behavior Editorial Assistant-Developmental Neuropsychology University of Nebraska-Lincoln/Psychology Department 324A Burnett Hall Lincoln, NE 68588-0308 Phone: (402)472-0168 Fax: (402)472-4637

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Control point edits adversely affect cortical surfaces using FS 5.1
by Vanessa Louise Cropley 11 Oct '12

11 Oct '12

Hi all, I have seen others post a similar problem on the freesurfer mailing list but I could not find a solution. When I edit a volume using control points, I am noticing that the use of CP edits adversely effects the wm/gm surfaces in the resulting re-processed image. Like others have reported, the surfaces are adversely affected in locations distant from the CP edits. The temporal lobes are particularly affected. We are using freesurfer 5.1. I have noticed the following things: 1. The problem occurs irrespective of the number of control points added, i.e. whether >100 or <10 control points added 2. The problem occurred when only one CP was added in a voxel that was clearly wm 3. The problem did not occur after reprocessing with FS 4.5 4. I have tried the flag to disable mri_ca_normalize when reprocessing with –autorecon2. This did not seem to help. I used the command: recon-all –nocanorm –autorecon2-cp –subjid $SUBJ I have screenshots available that illustrate the changes in the surfaces after reprocessing. Could anyone help with this problem? Thank-you, Vanessa

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Boundary problem
by youngmin huh 11 Oct '12

11 Oct '12

Dear all, I'm working with some 3T images and got some bad segmentation problem. I ran recon1 with nuintensitycor-3T, recon2, and recon2-cp after adding some control points. I attached an example. As you can see, it has kind of scrambled white matter boundaries. I wonder how I could fix this. Thanks, youngmin Huh

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Re: [Freesurfer] cortical parcellation question
by Bruce Fischl 11 Oct '12

11 Oct '12

Hi Daniel, no, sorry. The gca is not a cortical atlas. Those labels are stored in the .gcas file and aren't in the same space (in fact, they are in a surface-based spherical coordinate system and not in the volume at all, so not easily combinable). Bruce On Thu, 11 Oct 2012, Daniel Ferreira wrote: > Thanks for the detailed information. > > The mean intensity image (mean_intensity.nii) generated from frame #1 is > almost exactly what I need. This image has all the sub-cortical regions > assigned a discrete integer number (i.e. all the voxels in the left > cerebelllar grey matter = 8 and right = 47). However the whole of the > neocortex is defined as left (intensity = 3) and right (intensity = 42) > only, there are no cortical sub-divisions. > > Is it possible to have the individual neocortical regions assigned a > discrete integer number; (obviously not one already assigned to the other > regions in the mean_intensity.nii image)? For example all inferior temporal > voxels = 9; middle temporal voxels = 10; superior temporal voxels = 11. So > each of the regions defined in the "colortable_desikan_killiany.txt" file > found in the FREESURFER_HOME/average/ directory are also defined in the > mean_intensity.nii image? > > Thanks > > > 2012/10/6 Bruce Fischl <fischl(a)nmr.mgh.harvard.edu> > Hi Daniel > > it's in .gca format, and includes information that wouldn't fit > in a nifti file (e.g. markov relationships). You can use > mri_convert to extract some of the basic info though (e.g. the > most likely class at each location and the mean intensity of the > most likely class) using mri_convert. For example: > > mri_convert $FREESURFER_HOME/average/RB_all_2008-03-26.gca#0 > ./labels.nii > mri_convert $FREESURFER_HOME/average/RB_all_2008-03-26.gca#1 > ./mean_intensity.nii > > > where the #<n> syntax mean extract the nth frame from the 4D gca > volume. Frame 0 is the most likely label and frame 1 is the mean > intensity. Note however that there is lots more info in the .gca > that this doesn't capture such as the MRF parameters I mentioned > above, class variances, other class probabilities, etc.... > cheers > Bruce > > > > > On Thu, 4 Oct 2012, Daniel Ferreira wrote: > > Thanks Bruce, > When you say the atlas itself is included in the > Freesurfer distribution, do > you mean there is a 3D version of it available in > the download? > Also, I am not looking for the individual subjects' > images, I just want a > copy of the final atlas as a 3D image in > analyze/nifti format. (i.e. in the > same format as the Harvard-Oxford atlas that is > downloaded with FSL). > > Thanks a lot. > > Daniel Ferreira > > > > 2012/10/3 Bruce Fischl <fischl(a)nmr.mgh.harvard.edu> > Hi Daniel, > > 1. Do you mean the atlas or the parcellation > of your subjects? > We cannot distribute the individual subjects > in the atlas as the > data was collected under an IRB long ago that > didn't include > this. The atlas itself (summary statistics > derived from those > subjects) is included in the FreeSurfer > distribution. > > 2. The subcortical areas are the same, but not > the cortical > ones. That cortical parcellation is quite > coarse, and while we > did implement it we were never given > permission to distribute > the automated version, so it is not part of > FreeSurfer. The > boundaries that we define are thus different > than that one (and > since the Harvard-Oxford one is based on > volumetric labeling of > folding patterns we found that it contained a > bunch of errors in > which e.g. the wrong side of a sulcus was > labeled) > > cheers > Bruce > > > On Wed, 3 Oct 2012, Daniel Ferreira wrote: > > Dear experts, > I have a couple of questions regarding > the cortical > parcellation atlas that > is used in Freesurfer: > > 1) I would like to know if it is > possible to obtain > the Desikan-Killiany > atlas in 3D analyze/nifti format. With > each region > of the brain assigned a > discrete integer number (for example the > all of the > voxels of the left > inferior temporal lobe have an intensity > = 1, or > the whole of the left > hippocampus = 2). > > 2) Are the Harvard-Oxford cortical and > subcortical > atlases that can be > downloaded with FSL the same as the > cortical > parcellation atlas that is used > in Freesurfer? (i.e. are the > neuroanatomical > boundaries the same; does the > left inferior temporal cortex in the > Freesurfer > cortical parcellation = the > left inferior temporal cortex in the > Harvard-Oxford > atlas downloaded with > FSL) > > Many thanks > > Daniel Ferreira > > > > > > > The information in this e-mail is intended only for > the person to whom > it is > addressed. If you believe this e-mail was sent to > you in error and the > e-mail > contains patient information, please contact the > Partners Compliance > HelpLine at > http://www.partners.org/complianceline . If the > e-mail was sent to you > in error > but does not contain patient information, please > contact the sender > and properly > dispose of the e-mail. > > > > > >

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WM/GM boundary changes and control points
by EK Kim 10 Oct '12

10 Oct '12

I already uploaded this problem 2 days ago, reprocessing the subject to make sure about control points. However when I added the control points to the left hemisphere, the right hemisphere surface was changed severely. I used the command line, recon-all -autorecon2-cp -s subjectID. Could you tell me why does it occur and how to deal with it? Best, EK

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assembling data
by Gregory Kirk 10 Oct '12

10 Oct '12

a have a bunch of data stored in the subj_id directories of the subjects for convieniance but it is already in the average surface space, but i want to assemble it into one file so i can run the glm. mris_preproc --fsgd subset.fsgd --target subset_average --hemi lh --meas winkler.mgh --out lh.surf.mgh does not work obviously as the subjects # verticies does not agree ERROR: number of vertices in /study5/aa-scratch/UTAH/freesurfer_subjects/AD33112_2/surf/lh.winkler.mgh does not match surface (163842,149346) because it thinks the surf is on the subj_id surface. how can i accomplish ? cheers greg

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volumes per lobe
by Carolina Valencia 10 Oct '12

10 Oct '12

Hi FS users and developers, I need to obtain the volume per lobe (occipital, parietal, temporal, frontal) in a particular subjects and if it is possible divided by gray and white matter. I found similar topics in the mailing list, but I don't succeed to get this values. I follow the instructions for the FSv5.1 Using mri_annotation2label and mris_anatomical_stats but I got values for each hemisphere instead of lobes. mri_annotation2label --subject vol17 --hemi rh --lobesStrict rhlobesfile mri_annotation2label --subject vol17 --hemi lh --lobesStrict lhlobesfile then: mris_anatomical_stats vol17 rh mris_anatomical_stats vol17 lh I got values number of vertices = 115348 total surface area = 76188 mm^2 total gray matter volume = 282811 mm^3 average cortical thickness = 3.071 mm +- 1.034 mm average integrated rectified mean curvature = 0.149 average integrated rectified Gaussian curvature = 0.106 folding index = 4797 intrinsic curvature index = 391.1 Can somebody guide me? Thank you in advance, -- -- *Carolina Valencia * The information contained in this message and its attachments is confidential and intended for exclusive use of the recipients. If you received this email by error please notify the sender and delete it. The use, retention or distribution for any purpose is prohibited. Link is not responsible for damage caused by the contents of this message. The recipient should check for any presence of viruses or other defects.

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(Ir?)Regular durations for recon-all -all
by Denis-Alexander Engemann 10 Oct '12

10 Oct '12

Dear Freesurfers, presumably this is quite a newbie's question but I was wondering whether my recon-all times can be plausible if it takes less then 10 or 12 hours to perform the entire routine on a local machine. I'm using freesurfer 64 bit on Debian testing equipped with 16GB of RAM and Intel Core i7 CPUs (3.4Ghz), build-stamp: freesurfer-Linux-centos4_x86_64-stable-pub-v5.1.0. On superficial inspection, the results seem ok but I fear I'm overlooking something important. Any pointers would be of great help. Cheers, Denis ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------ Forschungszentrum Juelich GmbH 52425 Juelich Sitz der Gesellschaft: Juelich Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498 Vorsitzender des Aufsichtsrats: MinDir Dr. Karl Eugen Huthmacher Geschaeftsfuehrung: Prof. Dr. Achim Bachem (Vorsitzender), Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt, Prof. Dr. Sebastian M. Schmidt ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------ Kennen Sie schon unsere app? http://www.fz-juelich.de/app

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