[Paraview] quantifying overlap between two volumes

[Klara Schevenels]

Hi Sam,

Thanks again for your answer! I included a printscreen of an image I have been working on to clear things up. The purple regions are brain activations for a fMRI-task and are all combined into one vtk file. The coordinates are the spheres in different colors and each have their own vtk file.

Enjoy your weekend!

Best,
Klara
[cid:image001.png at 01D3555B.2AC8BD60]
From: Samuel Key [mailto:samuelkey at bresnan.net]
Sent: vrijdag 3 november 2017 20:14
To: Klara Schevenels <klara.schevenels at kuleuven.be>
Subject: Re: [Paraview] quantifying overlap between two volumes


Klara--

I am sure there are several ways to do this, unfortunately you will need to supply the list with more information about the nature of the datum set.

If your two *.vtk files have matching points (same number and same coordinates) you can use the Append Data filter to combine the two datum sets. However the two datum sets will have to have different variable names for the POINT values. Use either a text editor on one of the *.vtk files to change the variable name, or use the Calculator filter to rename the variables from one of the *.vtk datum sets before you use the Append Data filter.

With the merged datum sets, you can then use the Calculator filter to computer the difference in the two values and give the difference a new name.

Hope this helps.

--Sam

On 11/3/2017 8:15 AM, Klara Schevenels wrote:
Hi Sam

Thank you very much for your response! I loaded all of the files in the same window, so the visualization is quite good. But I'd like to become a quantification of how much overlap there is between the reference activation and the coordinates I have (like a % or something).
You think you have any ideas on that?

Best
Klara

From: ParaView [mailto:paraview-bounces at paraview.org] On Behalf Of Samuel Key
Sent: vrijdag 3 november 2017 14:42
To: paraview at paraview.org<mailto:paraview at paraview.org>
Subject: Re: [Paraview] quantifying overlap between two volumes


Klara--

Have you tried to load both one.vtk and separate.vtk into a single render window? ParaView is quite capable of doing this.  If the "reference file" separate.vtk image needs to be shifted, the transform filter will let you re-position the image.

Hope this helps.

--Sam

On 11/3/2017 4:39 AM, Klara Schevenels wrote:
To whom it may concern,

I just started working with Paraview for making 3D-images of the brain. More specifically, I want to quantify the overlap between the brain activation there is for some fMRI-task (one .vtk file) and some coordinates I have (separate .vtk files). Does anyone can advise how to start with this? I've been searching on the internet but I cannot find a clear answer to this question.

Many many thanks in advance!

Best
Klara Schevenels






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