MATLAB: How to convert volume in voxels to volume in cm3 or mm3

I have calculated 3D volume of an object in the form of number of voxels. Now I have to show the volume in cm3 or mm3. I have to compare the real volume of object and calculated volume. Please help.

Best Answer

You need to multiply by a spatial calibration factor. How many voxels cover a cm? See my attached spatial calibration demo.

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MATLAB: Altering CT Volume voxel values in Matlab

It looks like when you use this line:

    Vol(Vol(:,:,p) > 0) = 65535

you are in fact referring to a 2D matrix corresponding to a single channel from an image instead of a 3-channel image from your volume. I think it would save you trouble if you used this:

Vol(Vol > 0) = 65535;

instead of your for-loop, since you would then replace all the pixel values greater than 0 with 65535.

EDIT:

I just saw that you asked this question on Stack Overflow, good idea by the way, and that Ray provided a very thorough explanation! Anyhow I hope it is clearer for you now :)

MATLAB: Differences between “Moist air” and “Gas” library of Simscape

Hi Alberto,

I think you are trying to find functional difference between Moist air and Gas library of Simscape. Moist air mixture has additional Trace gas which is an optional third species in addition to dry air and water vapor. The usable components while modelling gas models are Gas mass flow rate, pressure source blocks and in case of moist gas models, it includes moist air mass flow rate, pressure, volumetric flow rate source blocks. For more information, you can refer to the documents of gas systems and moist air systems.

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MATLAB: Altering CT Volume voxel values in Matlab

MATLAB: Differences between “Moist air” and “Gas” library of Simscape

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