How to get the volume and surface area of separated isosurfaces

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AbioEngineer 2021-7-26

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https://ww2.mathworks.cn/matlabcentral/answers/886164-how-to-get-the-volume-and-surface-area-of-separated-isosurfaces

评论： darova 2021-7-27

在 MATLAB Online 中打开

I have a 3D array called "test" which is 512x512x52. I can display the isosurface using the following line:

volshow(test,'Renderer','Isosurface','Isovalue',0.55)

which generates the following image:

How can I get the voxels in each enclosed isosurface? I need to calculate the voume of each piece (ideally only those that are spherical). I already know the dX=0.1657, dY=0.1657, and dZ=0.5 of a voxel, I just need to know which pixels are included in each of the distinct enclosed surfaces so I can get a distribution of volumes. I need to do the same for the surface areas.

I read this answer (https://www.mathworks.com/matlabcentral/answers/436461-calculate-volume-from-an-isosurface), but I am confused how they could use that isovalue of -2. Every element in my 3D array is greater than the isovalue I selected to display the image shown above (which is isovalue of 0.51)

Any guidance is sincerely appreciated.

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Answer 1

darova 2021-7-26

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https://ww2.mathworks.cn/matlabcentral/answers/886164-how-to-get-the-volume-and-surface-area-of-separated-isosurfaces#answer_754009

Use bwlabel to separate each blob

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AbioEngineer 2021-7-26

but why is the isovalue 0.51 when I use volshow https://www.mathworks.com/help/images/ref/volshow.html but none of my actual values in the 3D array fall below that? The values in the array are in the 1600's while the isovalue must be a "non-negative number between [0 1]" according to the volshow documentation.