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I Think

by hyla, published

I Think by hyla Oct 21, 2013
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10487Views 2485Downloads Found in Biology
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Summary

Cogito ergo sum :)

Made from MRI data, which was actually rather coarse (take a look at the picture of the surface reconstruction).
Still. Works. I think :)

Instructions

One DOES aquire knowledge over time :)
This is how I did it:
I am using MRI data with a slice thickness of 7mm. Less would be better but that was all I got at home. The data used is a "dark fluid" sequence, called "FLAIR" by our manufacturer. The advantage of that sequence type is that - as it says in the nick name "dark fluid" - water appears dark. Structures like bone or skin are of a dark grey whereas brain matter is of a lighter grey.
So segmentation of the brain surface is made rather easy. In this case this is done by using InVesalius. The STL file I get from that is cleaned up in Meshlab and there's some smoothing, too (I think I took "Taubin Smooth"). Finally the result of that was repaired using Netfabb.
The apex region has come out the best although some piece of the brain was missing in the scan ;) .
The bottom slices of the scan show some artifacts and contain structures like the skull basis and vessels that show up in the 3D data and have to be removed manually. Still, nice I think.
I must try to get data with a better resolution :)
CT data would offer that but there the segmentation of the brain is a lot of work - with messy results ;)

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I Think by hyla is licensed under the Creative Commons - Attribution - Share Alike license.

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They're almost certainly not that appealing! Mostly arthritic twists and turns - but I'd really like to get a good look at 'em!

This is absolutely fascinating! I have several MRI scans of decaying bits of my body which it would be really nice to model in 3D (trying to read 'slices' needs more expert eyes than mine!).
I'm going to try and follow your instructions and se where it gets me; but do keep posting your progress - I'll follow it with great interest!

I'd just LOVE to see decaying bits of You on Thingiverse, what with Helloween around the corner ;)
Alas, it's not so easy... as I wrote: You need special sequences for it to work properly (or different tools?) .
And thin slices. Unfortunately MRI usually does not produce these.

Please let me know if You have any problems and/or maybe solutions.

Christoph

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