Freesurfer October 2016

freesurfer@nmr.mgh.harvard.edu

120 participants
170 discussions

Help on "mris_anatomical_stats"
by Lim, Lena 06 Apr '17

06 Apr '17

Dear Experts, I ran a group analysis in Qdec for the left volume and found a region of significant group difference. I wanted to extract this ROI. I defined this label and used the "map label to subjects" option in Qdec and ran the following but encountered the following error. Please kindly help... [spjwker@nanlnx2 FSL]1% mris_anatomical_stats -l lh.HCA_vol.label \-b -f PAC07/stats/lh.HCA_vol.stats PAC07 lh limiting computations to label lh.HCA_vol.label. reading volume /home/spjwker_PAC/Lena/CT_SA/FSL/PAC07/mri/wm.mgz... reading input surface /home/spjwker_PAC/Lena/CT_SA/FSL/PAC07/surf/lh.white... reading input pial surface /home/spjwker_PAC/Lena/CT_SA/FSL/PAC07/surf/lh.pial... reading input white surface /home/spjwker_PAC/Lena/CT_SA/FSL/PAC07/surf/lh.white... Segmentation fault Many thanks, Lena

2 1

ExploreDTI Workshop!
by Szabolcs David 02 Apr '17

02 Apr '17

Thrilled to announce that we are going to hold an ExploreDTI workshop in Utrecht (July 4-6)! More details can be found here: http://www.exploredti.com/workshop. We hope to see you there! Cheers, Szabolcs

1 3

Inflation of one hemi only
by Kang, XJ 10 Mar '17

10 Mar '17

Hi, I am trying to inflate right hemisphere only using the commands: recon-all -autorecon2 -hemi rh -subjid 160526 recon-all -autorecon3 -hemi rh -subjid 160526 The inflation stopped at the step: mris_volmask --label_left_white 2 --label_left_ribbon 3 --label_right_white 41 --label_right_ribbon 42 --save_ribbon 160526 SUBJECTS_DIR is /home/sata3/FreeSurfer/Subjects MRISread(/home/sata3/FreeSurfer/Subjects/160526/surf/lh.white): could not open file The program "mris_volmask" needs to read "lh.white", which is not generated. Any expert has any suggestions? Maybe I didn't use the commands correctly? Thank you for your help. XJ Kang

3 6

Cerebral (without ventricles) Volume = aseg.stats / SupraTentorialNotVent ?
by Kaiming Yin 21 Feb '17

21 Feb '17

Dear guys, Could I ask which value in the stats/aseg.stats represents the volume of the cerebrum (including the subcortical structures while excluding the ventricles and brain stem)? I'm not sure whether the "SupraTentorialNotVent" can be the value for this measurement, and could it be a bit bigger than the real value due to the partial volume effect? Besides, could I also ask is there a value represent the volume of the cerebellum? Currently I calculate the volume by adding the left/right cerebellar GM/WM values in the detailed list in aseg.stats file. Many thanks, Kaiming

2 3

Analysis of rates or percent changes
by Katarina Trojacanec 14 Feb '17

14 Feb '17

Hi, I have a question about the analysis of rates or percent changes. I use data with available scans at baseline (TP1) and the 6-month (TP2), 12-month (TP3) and 24-month (TP4) follow-ups from ADNI dataset. An example of some of the data in the appropriate qdec table is given below: fsid fsid-base years age weight diagnosis gender Glob_CDR NPI-Q_TotScr MMSE_TotScr FAQ_TotScr visit1_2_3_4 ADNI_sub1_sc ADNI_base1 0 81.3 y AD M x x x x sc ADNI_sub1_m06 ADNI_base1 0.528767123 81.9 y AD M x x x x m06 ADNI_sub1_m12 ADNI_base1 1.030136986 82.4 y AD M x x x x m12 ADNI_sub1_m24 ADNI_base1 2.030136986 83.4 y AD M x x x x m24 ADNI_sub2_sc ADNI_base2 0 74 y AD F x x x x sc ADNI_sub2_m06 ADNI_base2 0.501369863 74.5 y AD F x x x x m06 ADNI_sub2_m12 ADNI_base2 1.005479452 75 y AD F x x x x m12 ADNI_sub2_m24 ADNI_base2 2 76 y AD F x x x x m24 The base is constructed using all four time points. The time variable is given in years. I am using long_stats_slopes for aseg.stats as follows: long_stats_slopes --qdec ./qdec/long_AD_NL_TP1_2_3_4.qdec.table.dat --stats aseg.stats --meas volume --sd $SUBJECTS_DIR --do-avg --do-rate --do-pc1fit --do-pc1 --do-spc --do-stack --generic-time --time years --stack-avg ./qdec/long_AD_NL_TP1_2_3_4 (similarly for ?h.aparc.stats) Having in mind that TP1 and TP2, as well as TP2 and TP3 are separated approximately 6 months and TP3 and TP4 are separated approximately 12 months, are the annualized percent change or atrophy rates using this scenario reasonable (statistically?). Is it maybe more reasonable to apply the same scenario using three time points (for example TP1, TP3 and TP4 from the previous example and the template based only on these time points with the same approximate difference between all of them of 12 months, or TP1, TP2 and TP3 from the previous example and the template based only on these time points with the same approximate difference between all of them of 6 months)? Best Regards, Katarina Trojacanec, M.Sc. Teaching and research assistant Faculty of Computer Science and Engineering Ss. Cyril and Methodius University - Skopje, Republic of Macedonia

2 8

problem of using freesurfer
by Hsin-Tsung Lee 15 Dec '16

15 Dec '16

Dear freesurfer community I have used the freesurfer v5.30 stable on linux, I want to fusion the CT image and the MRI T1 image. The CT image was signed form the epilepsy patient after the inserted depth electrode surgery. The MR image was sign before the operation. I tried to register them by the "bbregister" or "mri_robust_register" , but it didn't work good. And I had seen the website page " https://mail.nmr.mgh.harvard.edu/pipermail//freesurfer/2016-June/046081.html" , does the "mri_coreg" is the better instruction to use in my case? And, I found that I can't find the download link of freesurfer v6.0 in your website, and the link " ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/mri_coreg.mac " is invalid to use. I really appreciate any help here HsinTsung Lee

4 6

surface based analysis for subcortical structures
by John Anderson 28 Nov '16

28 Nov '16

3 11

Training Tracula to add more pathways
by Kristafor Farrant 21 Nov '16

21 Nov '16

Hi there, As a complete newbie to the Tracula tool, I have a questions about using it. Is it possible to train tracula to track additional pathways other than the 18 thats are already included? I was to track several pathways that are not included with Tracula. Best, Kris

2 2

[FreeSurfer] TRACULA Registration transform matrix
by Ostrowski, Lauren 21 Nov '16

21 Nov '16

Hi experts, We're trying to convert an ROI in T1 MRI space to diffusion space in order to collect FA values from the ROI (using TRACULA output files). Is there a t1 to dwi transform matrix to use with TRACULA? Thanks, Lauren

2 1

tracula reinit
by Lars M. Rimol 21 Nov '16

21 Nov '16

Hi, Rerunning the tractography using reinit, is it an absolute requirement to specify number of control points? It doesn't seem like I can just set reinit = 1 and let the number of control points be the default. Also, is there a trade-off in terms of number of control points? For instance, when reconstructing the forceps major, the default number of control points is already 7, i.e. the highest of any tract. What if I double it? Apart from the fact that it takes longer, is there any drawback to using lots of controls points? Thank you! LMR

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Freesurfer October 2016