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30070 discussions

Doubts with region areas on the fsaverage sphere
by jorge luis 05 Feb '07

05 Feb '07

Hello all I have made deep changes in 9 regions of a left hemisfere of a subject surface after maped it onto the fsaverage subject sphere. The changes were made to have areas close to 15 mm^2. I computed the areas by add the areas of the faces inside the regions (computed using the vertexes spherical coordinates). The freesurfer sphere mapping is based in minimal metric distortion, so, why I got the following differences?: Region Computed areas (mm^2) Computed areas (mm^2) uing mri_surfcluster as explained before with the fsaverage sphere 1 27.56 15.0522 2 21.78 15.0946 3 21.41 15.1087 4 20.77 15.1501 5 19.28 15.1797 6 16.60 15.1918 7 15.99 15.2781 8 14.31 15.3373 9 13.89 15.0541 In both cases the same surface vertexes were found to be inside the regions Another thing: Should I use the sig.mgh file resulted from the mri_glm estimation as the input to the mri_surfcluster function in MonteCarlo simulations? (plus the .csd file of course). In advance thank you a lot Jorge ______________________________________________ LLama Gratis a cualquier PC del Mundo. Llamadas a fijos y móviles desde 1 céntimo por minuto. http://es.voice.yahoo.com

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total brain volume
by Derin Cobia 05 Feb '07

05 Feb '07

I would like to calculate total brain volume (defined as: total white, gray, and subcortical altogether). Should I take the BrainSegVol and minus out cerebellum and ventricles, or add the white and gray matter volumes from mris_anatomical_stats (it seems I remember hearing that white matter from mris_anatomical_stats is not reliable)? Thanks. -Derin

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aseg voxels
by Don Hagler 04 Feb '07

04 Feb '07

Hi, I've found that the number of voxels for a given aseg ROI in aseg.stats does not match exactly the number of voxels when I load the aseg.mgz in matlab and find the voxels of the corresponding ROI code. e.g. vol=load_mgh('aseg.mgz'); length(find(vol==17)). Is there a reason for this difference? Don _________________________________________________________________ Get in the mood for Valentine's Day. View photos, recipes and more on your Live.com page. http://www.live.com/?addTemplate=ValentinesDay&ocid=T001MSN30A0701

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mri_convert failure
by Joan Fisher 04 Feb '07

04 Feb '07

Hi all -- I have edited an anatomical volume (using AFNI's 3dcalc and 3dLRflip commands), and the final volume looks good. My reading is that mri_convert should not have trouble recognizing an afni BRIK file. However, the error is: unknown file type for file ... (The original Volume+orig.BRIK file went through the mri_convert step with no problem.) Is there another way to convert the final merged+orig file below into an 001.mgz file? Or should I be using a flagged option that I'm unaware of? Help appreciated. Joan For anyone interested in the steps I took in AFNI to make the transformed brain, they are: History of inputs to 3dcalc === [joan@cronus: Sat Feb 3 16:35:56 2007] === Input a: [joan@cronus: Sat Feb 3 16:35:56 2007] [joan@cronus: Fri Dec 22 16:18:07 2006] to3d -spgr -prefix Volume -session Results -view orig -xFOV 120.003A-119.997P -yFOV 120.0S-120.0I -zSLAB 88.733L-89.767R '3D:0:8432:256:256:1:Volume/I*' [joan@cronus: Sat Feb 3 16:20:52 2007] Dataset Copy {Input: Dataset=005/Results/Volume+orig.HEAD} {Output: Prefix=rotated} {Data Fill: Method=Data [All]} [joan@cronus: Sat Feb 3 16:24:43 2007] plug_nudge: -rotate 0.00I 0.00R -6.00A -ashift 0.31S -2.98L 0.00P [joan@cronus: Sat Feb 3 16:35:56 2007] === Input b: [joan@cronus: Sat Feb 3 16:35:56 2007] [joan@cronus: Fri Dec 22 16:18:07 2006] to3d -spgr -prefix Volume -session Results -view orig -xFOV 120.003A-119.997P -yFOV 120.0S-120.0I -zSLAB 88.733L-89.767R '3D:0:8432:256:256:1:Volume/I*' [joan@cronus: Sat Feb 3 16:20:52 2007] Dataset Copy {Input: Dataset=005/Results/Volume+orig.HEAD} {Output: Prefix=rotated} {Data Fill: Method=Data [All]} [joan@cronus: Sat Feb 3 16:24:43 2007] plug_nudge: -rotate 0.00I 0.00R -6.00A -ashift 0.31S -2.98L 0.00P [joan@cronus: Sat Feb 3 16:31:05 2007] 3dLRflip -prefix flip rotated+orig. [joan@cronus: Sat Feb 3 16:35:56 2007] === Input c: [joan@cronus: Sat Feb 3 16:35:56 2007] [joan@cronus: Fri Dec 22 16:18:07 2006] to3d -spgr -prefix Volume -session Results -view orig -xFOV 120.003A-119.997P -yFOV 120.0S-120.0I -zSLAB 88.733L-89.767R '3D:0:8432:256:256:1:Volume/I*' [joan@cronus: Sun Jan 14 20:52:47 2007] Dataset Copy {Input: Dataset=005/Results/Volume+orig.HEAD} {Output: Prefix=Lesion} {Data Fill: Method=Zero [One]} [joan@cronus: Sat Feb 3 16:25:29 2007] Dataset Copy {Input: Dataset=005/Results/Lesion+orig.HEAD} {Output: Prefix=lesion_rot} {Data Fill: Method=Data [All]} [joan@cronus: Sat Feb 3 16:26:25 2007] plug_nudge: -rotate 0.00I 0.00R -6.00A -ashift 0.00S -3.00L 0.00P [joan@cronus: Sat Feb 3 16:35:56 2007] =================================== [joan@cronus: Sat Feb 3 16:35:56 2007] 3dcalc -a rotated+orig. -b flip+orig. -c lesion_rot+orig. -expr '(1-c)*a+c*b' -prefix merged These steps created merged+orig.BRIK and merged+orig.HEAD that look fine in afni.

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problem with flattening
by Doris Tsao 04 Feb '07

04 Feb '07

Hi, I'm trying to make flatmaps of some monkey brains, and am having the following problem: the map never unfolds properly, there is always a section where it folds over itself. Any idea what that's due to? thanks! doris

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Problem with T1 intensities
by Dan Dillon 03 Feb '07

03 Feb '07

Dear FreeSurfers, I have a subject whose T1.mgz white matter values are consistently around 160, instead of 110. I figure I will have to tweak mri_normalize and re-run autorecon1 to fix this--am I right? If so, any tips regarding what flags and arguments will help address this problem? Thanks! Dan Dillon

2 1

some questions about volumes of aseg, .aparc, .aparc.2005s
by Woo Suk, Tae 03 Feb '07

03 Feb '07

.Bold { font-weight: bold; } .Title { font-weight: bold; font-size: 18px; color: #cc3300; } .Code { border: #8b4513 1px solid; padding-right: 5px; padding-left: 5px;color: #000066; font-family: 'Courier New' , Monospace;background-color: #ff9933; } Dear Freesurfer experts. I have some questions about calculated volumes by freesurfer. 1. Are the volumes in aseg, .aparc, .aparc.2005s absolute volumes measured in naive space or volumes measured after spatial normalization. 2. How much accurate the volumes (hippocampus, amygdala, thalamus, insula, precentral, etc) in aseg, .aparc, .aparc.2005s. And they are verified? 3. Are the volumes in lh(or rh).aparc gray matter volumes? 4. What is meaning G_*, and S_* in lh(or rh).aparc.a2005s? 5. How can I separately see the strucures of .aparc, .aparc.2005s in pial surface rendering? Woo Suk, Tae Ph.D Seoul, Korea

1 0

timecourse overlay
by T. Song 02 Feb '07

02 Feb '07

Hi Bruce: Is there a way that I can load the MEG timecourse data on the freesurfer surface? Is it possible that we could get the timecourse waveform for a specific point on the surface? Thanks! Tao

3 4

transforms
by Chacko Cherian 02 Feb '07

02 Feb '07

Hello all, Is there some information on the wiki about the srctoDst voxel-to-voxel transform and the rastoRAas transform? THAnks Chacko. ____________________________________________________________________________________ Sucker-punch spam with award-winning protection. Try the free Yahoo! Mail Beta. http://advision.webevents.yahoo.com/mailbeta/features_spam.html

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converting from siemens IMA to mgz
by Binyam Nardos 02 Feb '07

02 Feb '07

Hi all, I just loaded raw structural scans into one of my subject directories. They are of siemens IMA format and I used the following command: mri_convert -it siemens -ot mgz 001/ 001.mgz I then got the following error: reading from 001/... ERROR: could not parse 001/ ERROR: siemensRead(): 001/ I tried finding similar problems in the threads but nothing yet. Appreciate any help, Binyam Binyam Nardos Cognitive Rehabilitation Research Group Washington University School of Medicine Box # 8505 4444 Forest Park Blvd St. Louis, MO 63108 Office: (314) 454-7795 Fax: (314) 286-1601 The contents of this e-mail message and any attachments are intended solely for the addressee(s) named in this message. This communication is intended to be and to remain confidential and may be subject to applicable physician/patient and/or work product privileges. If you are not the intended recipient of this message, or if this message has been addressed to you in error, please immediately alert the sender by reply e-mail and then delete this message and its attachments.

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