Freesurfer

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30097 discussions

Ploting convolved stimuli with actual stimuli
by Aser A 15 Sep '13

15 Sep '13

Hi all, Using the output from OptSeq, is there a possible ( easy ^u^ ) way of plotting in the same graph the presentation of stimuli with their convolution? So basically, I created my design using OptSeq. To make it nicer, I want to plot this. I am not aware of freesufer and I use SPM. In SPM it just shows the convolved stimuli without showing sticks of the stimuli. I have attached a picture taken from the genetic program that helps creating or optimizing fMRI designs just to show you what I mean or I want. I have also attached an excel file contains the output from OptSeq. Thanks Aser

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Interpretation of interaction effect in qdec
by Yang, Daniel 15 Sep '13

15 Sep '13

Hi FreeSurfer experts, Let's say I have two class variables: Sex (female, male) Dx (patient, control) I see that the analysis results show the following: Does the average thickness, accounting for Dx, diff between female and male? Red means: female > male Does the average thickness, accounting for Sex, diff between patient and control? Red means: patient > control Is there a Sex-Dx interaction in the mean thickness? Red means either (a) the female > male effect is stronger in patient (vs. control); or (b) the patient > control effect is stronger in female (vs. male) Is my interpretation correct? Thanks! Daniel -- Yung-Jui "Daniel" Yang, PhD Postdoctoral Researcher Yale Child Study Center New Haven, CT (203) 737-5454

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family wise error rate correction
by Venkatesh Rajagopalan 15 Sep '13

15 Sep '13

Hi All, I am trying to compare my VBM results from FSL with cortical thickness changes using freesurfer. I would like to perform permutation based FWER correction to see cortical thickness changes. The reason to do FWER correction is I used randomise in FSL with FWER correction so I want to keep my statistical approach the same between FSL and Freesurfer to compare VBM and cortical thickness changes. I extensiviely searched the archives but could not find an answer so posting this message I ran the following command mris_preproc --fsgd deisgn_all.fsgd --cache-in area.fwhm10.fsaverage --target fsaverage --hemi lh --out lh.all_gps.area.10.mgh mri_glmfit --y lh.all_gps.area.10.mgh --fsgd deisgn_all.fsgd dods --C group.diff.mtx --surf fsaverage lh --cortex --glmdir lh.all_gps.glmdir --sim perm 5000 1.3 csd1 --fwhm 7 --surf I do not know how to run the mri_surfcluster command. I read few posts and tried running the following mri_surfcluster --src sig.mgh --csd csd-group.3.diff.csd --ocp sig_cluster.mgh but I did not see any cortical thickness changes wheres I did see cortical thickness changes when simply using FDR option in the tksurfer. Kindly let me know where I am making the mistake. Any help will be greatly appreciated. Thanks Venkatesh Kessler Foundation is proud to be recognized as one of the Best Places to Work in New Jersey. The information in this transmission is intended for official use of the Kessler Foundation. It is intended for the exclusive use of the persons or entities to which it is addressed. If you are not an intended recipient or the employee or agent responsible for delivering this transmission to an intended recipient, be aware that any disclosure, dissemination, distribution or copying of this communication, or the use of its contents, is strictly prohibited. If you received this transmission in error, please notify the sender by return e-mail and delete the material from any computer.

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Re: [Freesurfer] [martinos-tech]
by Douglas N Greve 15 Sep '13

15 Sep '13

Hi Suzanne, I'll cc the FS list so others can benefit ... On 09/09/2013 06:02 AM, Suzanne Oosterwijk wrote: > Hi Doug, > > I have two follow-up questions to enhance my own understanding of > Freesurfer. I know that MC simulations take into account the > smoothness of the data. I noticed that the smoothing factor of my > surface maps is quite high (around 8/9 fwhm), even though I applied a > smoothing factor of 5 during pre-processing. Can you explain to me why > the final maps have such a high fwhm? Is this because of the > transformations that are necessary to create the surfaces? The final measured FWHM is a composite of the smoothing you applied plus any smoothness that may already be in the data. Eg, when the surfaces are created, there is a smoothness constraint that can cause smoothness in the surfaces. The gyrification index has very high smoothenss. For fMRI, there is already natural smoothness in the data plus smoothness added due to interpolation when sampling to the surface. > > Another question concerns the relationship between voxels and > vertices. Does one voxel corresponds to one vertex, or is the > relationship different? This may be a very stupid question, but I > thoroughly searched the wiki and the web without finding a > straightforward answer. Vertices and voxels are different entities. A voxel is a 3D box, a vertex is essentially a 2D triangle on the surface. The surface is made from a volume, of course. Initially, the square face of a voxel is divided into two triangles of equal size. The location of the vertices are then adjusted to get a better fit. Oftentimes, we use the term voxel and vertex interchangeably because each just represents a data point either on the surface or in the volume. > The next question is, if I want to apply a liberal threshold to my > data that is similar to say p < .005; k > 20, then how do I produce > this using the minarea flag in the mri_surfcluster command? I'm not sure what you mean by p < .005. Is that a vertex-wise threshold (ie, the cluster-forming threshold) or cluster-wise? What is k? If you want to correct for multiple comparisons, then you can run mri_glmfit-sim. Once you select a cluster-wise and cluster-forming thresholds (and given the FWHM and search space), the critical clustersize can be determined. doug > > Thanks in advance for your answers! > Suzanne > > > On Tue, Sep 3, 2013 at 3:57 PM, Douglas N Greve > <greve(a)nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>> wrote: > > > Hi Suzanne, the pre-computed data is for a full hemisphere. if you > have > a smaller search space, then the whole hemi results will be too > conservative. In that case, you should run mri_glmfit-sim without the > --cache and with --sim as indicated in your command line (which looks > correct to me). The simulations can take a while. If you send me your > label, I can compute cached tables for you, so you don't have to keep > running 10000 iterations of mri_glmfit-sim > > doug > > > On 09/02/2013 12:04 PM, Suzanne Oosterwijk wrote: > > [Attachment(s) <#TopText> from Suzanne Oosterwijk included below] > > > > Hi all, > > > > I have a question about the Monte Carlo simulation in Freesurfer. I > > would like to run a simulation to define the minimum cluster > size in a > > specific collection of vertices (say within a ROI label). After > > running a masked glmfit the pre-cached simulation doesn’t seem to > > correct for the smaller number of vertices; the text files > produce the > > same results. I also ran a full simulation to see whether that > made a > > difference, and then I got different results. I just want to > make sure > > that this is because the smaller volume was applied and not simply > > because the “real” simulation can differ from the pre-cached data. > > Attached are the different output files, the cached MC with > mask, the > > cached MC without mask, the simulation with mask and a normal > cluster > > search within the mask (which demonstrates that there are > > sub-threshold clusters). > > > > Below is my code, > > > > foreach s (f_fear_c_fear f_disg_c_disg f_mf_c_mf f_notc_c_notc) > > > > pushd ${s} > > > > mri_glmfit --surf fsaverage lh --y ces.nii.gz --osgm --glmdir > > glm.masked --label > > > /home/sooster1/Desktop/FALSE_FEEDBACK_imaging/DATA/feedback_structural/network_labels/FP_DN_network.label > > > > mri_glmfit-sim --cache 2.3 pos --sim-sign pos --cwpvalthresh .05 > > --glmdir glm.masked > > > > mri_surfcluster --sign pos --hemi lh --in glm.masked/osgm/sig.mgh > > --thmin 2.3 --thmax infinity --minarea 50 --subject fsaverage --sum > > glm.masked/osgm/cluster_pos_23.sum --o > > ./glm.masked/osgm/sig.cluster_pos_23.mgh --annot aparc > > > > cd .. > > > > end > > > > > > I used this code to run the simulation: > > > > mri_glmfit-sim --glmdir glm.masked --sim mc-z 10000 2.3 mc-z.pos.23 > > --sim-sign pos > > > > Thanks in advance for responding! > > > > Suzanne > > > > -- > Douglas N. Greve, Ph.D. > MGH-NMR Center > greve(a)nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu> > Phone Number: 617-724-2358 <tel:617-724-2358> > Fax: 617-726-7422 <tel:617-726-7422> > > Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting > <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> > FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 > www.nmr.mgh.harvard.edu/facility/filedrop/index.html > <http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html> > Outgoing: > ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ > > > > 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. > > > > ------------------------------------ > > Yahoo! Groups Links > > <*> To visit your group on the web, go to: > http://groups.yahoo.com/group/martinos-tech/ > > <*> Your email settings: > Individual Email | Traditional > > <*> To change settings online go to: > http://groups.yahoo.com/group/martinos-tech/join > (Yahoo! ID required) > > <*> To change settings via email: > martinos-tech-digest(a)yahoogroups.com > <mailto:martinos-tech-digest@yahoogroups.com> > martinos-tech-fullfeatured(a)yahoogroups.com > <mailto:martinos-tech-fullfeatured@yahoogroups.com> > > <*> To unsubscribe from this group, send an email to: > martinos-tech-unsubscribe(a)yahoogroups.com > <mailto:martinos-tech-unsubscribe@yahoogroups.com> > > <*> Your use of Yahoo! Groups is subject to: > http://docs.yahoo.com/info/terms/ > > -- Douglas N. Greve, Ph.D. MGH-NMR Center greve(a)nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.html Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/

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Optseq2 design question - series of events
by John Ryan 15 Sep '13

15 Sep '13

Hi all - I'm trying to design my first event related experiment, and I'm having trouble figuring out how to best optimize the design...wondering if you have any insights: I have two conditions (milkshake and water). Each condition has several events in order: Participants get a squirt of milkshake (4s) then swallow (jittered?) then a rinse of water (no interest) then swallow (jitter again?). In the other condition, they just get a squirt of water and a swallow. In order to model all of this, would I need to put in every event that's taking up time as an event, and then just do an event contrast comparing the two conditions of interest (receipt of milkshake/water)? Or would I make the "events" be long enough to encompass all the actions that are taking place during that event (even though I'm just interested in the first 4s when the person is receiving a taste)? thanks for any tips.

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t-statistics map using tksurfer
by Chung, Yoonho 15 Sep '13

15 Sep '13

Dear all, Is there a way to visualize vertex wise t-values (t-statistics), instead of p-values, on a vertex map when you are doing group analyses? I successfully generated the p-maps using mri_glfmfit, but I am wondering if vertex-wise maps that represent t-values can be also generated and visualized using tksurfer. Another question I have is that is there a way to generate just average thickness maps within the same group? For example, if want to look at a vertex map that just shows mean thickness of all my controls, how would you generate that file that can be fed into tksurfer? Thanks in advance! Yoon

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mapping extracted MNI152 ROIs to individual subjects
by Paul Beach 13 Sep '13

13 Sep '13

Hello Freesurfer experts, I am currently trying to take extracted cortical networks from the Yeo_JNeurophysiol11_MNI152 package<https://surfer.nmr.mgh.harvard.edu/fswiki/CorticalParcellation_Yeo2011>and translate them to individual subjects to perform functional connectivity analyses - based on the individual networks, themselves. Currently the extracted ROIs are in '.nii.gz' format. My question is: How do I take the extracted ROIs and map them on to individual subjects? My thought was that mri_vol2vol could perhaps accomplish this, but I cannot find a help file for this command that would guide me in developing the line of code to write. Thanks! -- Paul Beach DO/PhD candidate - Year VI Michigan State University - College of Osteopathic Medicine - Neuroscience Program - Bozoki Lab: Neurology/Radiology

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Tracula and Qdec
by Alan Francis 13 Sep '13

13 Sep '13

Hi Anastasia and FreeSurfers: Is it possible to model Tracula data on Qdec? I have some interesting findings in FA and AD between two groups that I am hoping to visually represent on a single brain. Any advice would be deeply appreciated. thank you, Alan

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crash during longitudinal process when it run mri_ca_register
by Knut J Bjuland 13 Sep '13

13 Sep '13

Hi, I have run recon-al longitudinal process on abel cluster with this command recon-all -base @filename@_template -tp @filename@ -tp @filename@v2 -all -debug. However, it crashed or is killed when it ran mri_ca_register. I have looked through the log, and I have not found a reason for it being killed even tough I added -debug. The cluster is running sbatch and CentOS release 6.4. Are there any debug options I can add or are there any debugversion of mri_ca_register I can download? This happen every time I run the program. I have asked for 8g ram when ran the program. Best regards Knut Jørgen Bjuland

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Re: [Freesurfer] license error with FS5.3
by S.V.Shepherd [work] 13 Sep '13

13 Sep '13

Solved: The license file actually differed from the other installations in that the "#----cut here-----" lines were included. To my embarrassment, it took a second pair of eyes to notice this. I thought I'd fess up lest anyone else make the same mistake. stephen

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