3D Model of Inner Ear

[FRINGE377]

Hi, 

i want to make a 3D Model of parts of the inner ear(semicircular ducts and vestibular aqueduct). I tried to mark the ducts with the brush tool and then ROI>Set value pixel>-1024 outside Roi> 3d Volume Rendering. But I only see some strange object. What am I doing wrong or is there a better way to do it?

Thanks!

[Gustavo Curiel]

Hello FRINGE377,

What you are doing is actually correct, either way, what could be going wrong is:

1. You are not brushing in all images of the series, only a few or just one. 
2. In the 'Set value pixel' tool, check Apply to>'All ROIs'
3. The pixel remain after the operation 'ROI>Set value pixel>-1024 outside Roi', are low density structures that horos has a hard time to identify and render.

Suggestions:

1. Instead of using brush try to draw the area or ROI with the Close polygon, Pencil and repulser tool. Selecting every so many images, not every image of the series. And then with the tool ROI>ROI Volume>Generate missing ROIs, Horos will draw automatically the missing ones, just readjust with the selection or repulser tool.
2. Apart from using the option '-1024 outside Roi', it is recommend set the pixels inside ROIs at higher density (like positive 1024) so is easier to Horos to identify 

Hope it helps, we have done something similar, and let me tell you it is really complicated.

[Gustavo Curiel]

Another tip I can give you base on our experience, is to design and adapt to your patient. Obviously it depends of the application you have on mind. We design a temporal bone, for academic purposes, base on a patients study. So we try to retrieve most of the internal structure of the inner ear and the mastoid, but as the nature of the CT Scans is limited of how much information can get from the patients, specially inefficient with small structures. So base on what we retrieve and the knowledge of our medical team, we integer a biomedical design with the high quality CT Scan, and we end up satisfied with the results. I attach a video demonstration of the 3D model.

Inner ear pressentation 

https://drive.google.com/file/d/1_pHSahLBrxAK53T2-8i4tY32f1Uap7hd/view?usp=sharing

El lunes, 2 de septiembre de 2019, 7:31:33 (UTC-5), FRINGE377 escribió:

[FRINGE377]

Hi Gustavo,

thank you for your help! I finally managed that Horos shows me my 3D Model. But it looks very rough. Is there a way I can smooth it, so it looks nicer? 

The Model in the video you sent me looks perfect! Is there a way I can try the software you used to build this Model?

I'm not bound to Horos, i wanted to find an easy and accurate way to illustrate especially the vestibular aqueduct using CT Images, which i can use for my study.

[FRINGE377]

I don't know why you're other response isnt shown here, but I got it in my mail account. I did manage to get good  results with surface rendering. I'll try out Meshmixer! Thank you for your help and offer. I dont have a budget on this project, so I'll have to do it myself.

[Gustavo Curiel]

If you have further questions, I could assist you. You have my mail address I would happy to help