Blog/brainfmri to 3d model (#70)
* blog: fMRI to 3D Model * fixes * rejiggering
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title: How I Converted my Brain fMRI to a 3D Model
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date: 2019-08-23
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---
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# How I Converted my Brain fMRI to a 3D Model
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AUTHOR'S NOTE: I just want to start this out by saying I am not an expert, and
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nothing in this blogpost should be construed as medical advice. I just wanted
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to see what kind of pretty pictures I could get out of an fMRI data file.
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So this week I flew out to Stanford to participate in a study that involved a
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fMRI of my brain while I was doing some things. I asked for (and recieved) a
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data file from the fMRI so I could play with it and possibly 3D print it. This
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blogpost is the record of my journey through various software to get a fully
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usable 3D model out of the fMRI data file.
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## The Data File
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I was given [christine_brain.nii.gz][firstniifile] by the researcher who was
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operating the fMRI. I looked around for some software to convert it to a 3D
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model and [/r/3dprinting][r3dprinting] suggested the use of [FreeSurfer][freesurfer]
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to generate a 3D model. I downloaded and installed the software then started
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to look for something I could do in the meantime, as this was going to take
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something on the order of 8 hours to process.
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### An Animated GIF
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I started looking for the file format on the internet by googling "nii.gz brain image"
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and I stumbled across a program called [gif\_your\_nifti][gyn]. It looked to be
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mostly pure python so I created a virtualenv and installed it in there:
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```
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$ git clone https://github.com/miykael/gif_your_nifti
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$ cd gif_your_nifti
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$ virtualenv -p python3 env
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$ source env/bin/activate
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(env) $ pip3 install -r requirements.txt
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(env) $ python3 setup.py install
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```
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Then I ran it with the following settings to get [this first result][firstgif]:
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```
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(env) $ gif_your_nifti christine_brain.nii.gz --mode pseudocolor --cmap plasma
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```
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<center><video controls> <source src="https://xena.greedo.xeserv.us/files/christine-fmri-raw.mp4" type="video/mp4">A sideways view of the brain</video></center>
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<small>(sorry the video embed isn't working in safari)</small>
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It looked weird though, that's because the fMRI scanner I used has a different
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rotation to what's considered "normal". The gif\_your\_nifti repo mentioned a
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program called `fslreorient2std` to reorient the fMRI image, so I set out to
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install and run it.
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### FSL
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After some googling, I found [FSL's website][fsl] which included an installer
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script and required registration.
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37 gigabytes of downloads and data later, I had the entire FSL suite installed
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to a server of mine and ran the conversion command:
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```
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$ fslreorient2std christine_brain.nii.gz christine_brain_reoriented.nii.gz
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```
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This produced a slightly smaller [reoriented file][secondniifile].
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I reran gif\_your\_nifti on this reoriented file and got [this result][secondgif]
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which looked a _lot_ better:
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<center><video controls> <source src="https://xena.greedo.xeserv.us/files/christine-fmri-reoriented.mp4">A properly reoriented brain</video></center>
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<small>(sorry again the video embed isn't working in safari)</small>
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### FreeSurfer
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By this time I had gotten back home and [FreeSurfer][freesurfer] was done installing,
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so I registered for it (god bless the institution of None) and put its license key
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in the place it expected. I copied the reoriented data file to my Mac and then
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set up a `SUBJECTS_DIR` and had it start running the numbers and extracting the
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brain surfaces:
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```
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$ cd ~/tmp
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$ mkdir -p brain/subjects
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$ cd brain
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$ export SUBJECTS_DIR=$(pwd)/subjects
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$ recon-all -i /path/to/christine_brain_reoriented.nii.gz -s christine -all
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```
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This step took 8 hours. Once I was done I had a bunch of data in
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`$SUBJECTS_DIR/christine`. I opened my shell to that folder and went into the
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`surf` subfolder:
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```
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$ mris_convert lh.pial lh.pial.stl
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$ mris_convert rh.pial rh.pial.stl
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```
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Now I had standard stl files that I could stick into [Blender][blender].
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### Blender
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Importing the stl files was really easy. I clicked on File, then Import, then
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Stl. After guiding the browser to the subjects directory and finding the STL
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files, I got a view that looked something like this:
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<center><blockquote class="twitter-tweet"><p lang="en" dir="ltr">BRAIN <a href="https://t.co/kGSrPj0kgP">pic.twitter.com/kGSrPj0kgP</a></p>— Cadey Ratio 🌐 (@theprincessxena) <a href="https://twitter.com/theprincessxena/status/1164526098526478336?ref_src=twsrc%5Etfw">August 22, 2019</a></blockquote> <script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script></center>
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I had absolutely no idea what to do from here in Blender, so I exported the
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whole thing to a stl file and sent it to a coworker for 3D printing (he said
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it was going to be "the coolest thing he's ever printed").
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I also exported an Unreal Engine 4 compatible model and sent it to a friend of
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mine that does hobbyist game development. A few hours later I got this back:
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<center><blockquote class="twitter-tweet"><p lang="und" dir="ltr"><a href="https://t.co/fXnwnSpMry">pic.twitter.com/fXnwnSpMry</a></p>— Cadey Ratio 🌐 (@theprincessxena) <a href="https://twitter.com/theprincessxena/status/1164714830630203393?ref_src=twsrc%5Etfw">August 23, 2019</a></blockquote> <script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script></center>
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(Hint: it is a take on the famous [galaxy brain memes][galaxybrain])
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## Conclusion
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Overall, this was fun! I got to play with many gigabytes of software that ran
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my most powerful machine at full blast for 8 hours, I made a fully printable 3D
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model out of it and I have some future plans for importing this data into
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Minecraft (the NIFTI `.nii.gz` format has a limit of _256 layers_).
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I'll be sure to write more about this in the future!
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## Citations
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Here are my citations in [BibTex format][citations].
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Special thanks goes to Micheal Lifshitz for organizing the study that I
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participated in that got me this fMRI data file. It was one of the coolest
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things I've ever done (if not the coolest) and I'm going to be able to get a
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3D printed model of my brain out of it.
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[firstniifile]: https://xena.greedo.xeserv.us/files/christine_brain.nii.gz
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[secondniifile]: https://xena.greedo.xeserv.us/files/christine_brain_reoriented.nii.gz
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[r3dprinting]: https://www.reddit.com/r/3Dprinting/comments/2w0zxx/magnetic_resonance_image_nii_to_stl/
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[freesurfer]: https://surfer.nmr.mgh.harvard.edu/fswiki/FreeSurferWiki
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[gyn]: https://github.com/miykael/gif_your_nifti
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[firstgif]: /static/blog/christine-fmri-raw.mp4
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[secondgif]: /static/blog/christine-fmri-reoriented.mp4
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[fsl]: https://fsl.fmrib.ox.ac.uk/fsl/fslwiki/
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[blender]: https://www.blender.org
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[galaxybrain]: https://knowyourmeme.com/memes/expanding-brain
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[citations]: /static/blog/brainfmri-to-3d-model.bib
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@ -0,0 +1,308 @@
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|
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|
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|
||||
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||||
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||||
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||||
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||||
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|
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NUMBER="4",
|
||||
PAGES="1181--1196",
|
||||
DOI="10.1016/j.neuroimage.2010.07.020",
|
||||
URL="http://dx.doi.org/10.1016/j.neuroimage.2010.07.020",
|
||||
YEAR="2010",
|
||||
}
|
||||
|
||||
@ARTICLE{reuter:bias11,
|
||||
AUTHOR="Martin Reuter and Bruce Fischl",
|
||||
TITLE="Avoiding Asymmetry-Induced Bias in Longitudinal Image Processing",
|
||||
JOURNAL="NeuroImage",
|
||||
VOLUME="57",
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NUMBER= "1",
|
||||
PAGES="19--21",
|
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DOI="10.1016/j.neuroimage.2011.02.076",
|
||||
URL="http://dx.doi.org/10.1016/j.neuroimage.2011.02.076",
|
||||
YEAR="2011",
|
||||
}
|
||||
|
||||
@ARTICLE{reuter:long12,
|
||||
AUTHOR="Martin Reuter and Nicholas J. Schmansky and Herminia Diana Rosas and Bruce Fischl",
|
||||
TITLE="Within-Subject Template Estimation for Unbiased Longitudinal Image Analysis",
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JOURNAL="NeuroImage",
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VOLUME="61",
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NUMBER="4",
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PAGES="1402--1418",
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DOI="10.1016/j.neuroimage.2012.02.084",
|
||||
URL="http://dx.doi.org/10.1016/j.neuroimage.2012.02.084",
|
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YEAR="2012",
|
||||
}
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|
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|
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@Article{pmid19059349,
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Author="Woolrich, M. W. and Jbabdi, S. and Patenaude, B. and Chappell, M. and Makni, S. and Behrens, T. and Beckmann, C. and Jenkinson, M. and Smith, S. M. ",
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Title="{{B}ayesian analysis of neuroimaging data in {F}{S}{L}}",
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Journal="Neuroimage",
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Note={[DOI:\href{https://dx.doi.org/10.1016/j.neuroimage.2008.10.055}{10.1016/j.neuroimage.2008.10.055}] [PubMed:\href{https://www.ncbi.nlm.nih.gov/pubmed/19059349}{19059349}] }
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}
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@Article{pmid15501092,
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Author="Smith, S. M. and Jenkinson, M. and Woolrich, M. W. and Beckmann, C. F. and Behrens, T. E. and Johansen-Berg, H. and Bannister, P. R. and De Luca, M. and Drobnjak, I. and Flitney, D. E. and Niazy, R. K. and Saunders, J. and Vickers, J. and Zhang, Y. and De Stefano, N. and Brady, J. M. and Matthews, P. M. ",
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Title="{{A}dvances in functional and structural {M}{R} image analysis and implementation as {F}{S}{L}}",
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Journal="Neuroimage",
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Year="2004",
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Volume="23 Suppl 1",
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Note={[DOI:\href{https://dx.doi.org/10.1016/j.neuroimage.2004.07.051}{10.1016/j.neuroimage.2004.07.051}] [PubMed:\href{https://www.ncbi.nlm.nih.gov/pubmed/15501092}{15501092}] }
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}
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|
||||
@Article{pmid21979382,
|
||||
Author="Jenkinson, M. and Beckmann, C. F. and Behrens, T. E. and Woolrich, M. W. and Smith, S. M. ",
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||||
Title="{{F}{S}{L}}",
|
||||
Journal="Neuroimage",
|
||||
Year="2012",
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Volume="62",
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Number="2",
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Pages="782--790",
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Month="Aug",
|
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Note={[DOI:\href{https://dx.doi.org/10.1016/j.neuroimage.2011.09.015}{10.1016/j.neuroimage.2011.09.015}] [PubMed:\href{https://www.ncbi.nlm.nih.gov/pubmed/21979382}{21979382}] }
|
||||
}
|
||||
|
||||
@misc{Notter2013,
|
||||
author = {Michael Notter},
|
||||
title = {gif_your_nifti},
|
||||
year = {2018},
|
||||
publisher = {GitHub},
|
||||
journal = {GitHub repository},
|
||||
howpublished = {\url{https://github.com/miykael/gif_your_nifti}},
|
||||
commit = {66cc30f988c0aff96d3263385b83e209e48aa4cc}
|
||||
}
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||||
|
||||
|
||||
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Reference in New Issue