I invite you to take a look at our new software MIPAR at http://MIPAR.us. It's segmentation and export tools could be critical to reconstructing your data and exporting to a form that comsol supports. We are growing the beta version everyday do if there is an export format you need that we don't have, we can certainly try to add it!

Dear John Sosa 

Thankyou so much for your reply.

Sure,I will look at your software. Even I just took a tour it seems good.

And file format which can be importable to comsol extensions are .mph, .mphbin , .mphtxt ,   .mphphb , .mphapp these are multiphysics files and instead of that it supports extensions files of Autocad files , IGES , PRO/ ENGINEER ,SOlidworks files , ECAD files... , .class , .stl , .step etc. I have requested for trial version. Will let you guys.

https://www.comsol.kr/fileformats

Thanks very much for giving it a try! You'll get a license key shortly. MIPAR can export in stl and vrml, so I think it may work for you. Let me know of any questions as you begin using it!

There are also available these tools: 3D Slicer https://www.slicer.org/ for the segmentation and reconstruction of model from MRI images and ParaView www.paraview.org/ for the conversion of vtk Slicer format to a importable Comsol format (VRML).

You could use also ImageJ, a free software to reconstruct 3D object from 2D pictures. It is a good software and it is easy to find tutorial on YouTube. The exportation to COMSOL might be more tricky. Not only about the file format, but also the mesh created from 2D pictures might be too detailed. COMSOL is made to work with 3D mesh made in comsol with a very clean surface and intersection. It won´t the case with a mesh created from 2D pictures. And be sure that your mesh doesn´t have any hole.

Wish you the best

Geoffrey

Dear Geoffrey

Thankyou for your answer. Actually i have tried this using image j combination with fiji but not able to import to comsol. It says file not valid or damaged.

Is there any solution for that.?

Thanks in advance.

Unfortunately, COMSOL is working with proprietary file format. So the other software cannot make an exportable file format toward COMSOL. The best might be contact COMSOL directly. I guess they do have this request quite often. Their answer will be most like to buy an (expensive) add-on to import the file format you need in COMSOL.

Now you may try 3D CAD file format or even better (from my point of view) .STL. You have also the opportunity to import in VRML. However .STL format is a very robust and clean format to import with. If you do not succeed to import a .STL file because is corrupted, try to clean it with Netfabb basic. Netfabb is a software used to clean object for 3D printing but actually is also very good to clean any kind of geometry.

Best luck

Geoffrey

Hi Nitish,

The best way to create 2D/3D geometric models in Comsol from MRI images is to do following:

1. Use Matlab for segmentation of MRI images. Make smaller multiple regions in 2D plane. In Matlab, you can save them in some image format. OR use COMSOL (with MATLAB) and work directly from scripting program itself.

2. Import each separate region in Comsol separately and give them a name.

3. Import all those separate geometries into Comsol and perform boolean operations of geometry addition/subtraction etc.

Feel free to ask more.

Best wishes