converting voxels to mm

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sapna jaiswal 2017-4-24

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https://ww2.mathworks.cn/matlabcentral/answers/336894-converting-voxels-to-mm

评论： Rik 2017-4-24

Hi Image Analyst, I am analysing MicroCT images for various 3D representations. The final output files give values in pixels. The voxel size of my images are 1x1x1(as I can see from the image properties). Could you please advice how to convert the output areas and volumes with units as mm or micrometers? Your advise would be of great help to me. Any idea how to use the matlab function in AVIZO fire to calculate this? Thanks

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sapna jaiswal 2017-4-24

Hi, Thank you for your response I appreciate it. I have calculated the volume by AVIZO software and the volume is a 8 digited number. I do not know what units it has used for the calculation. I know that the pixel size is 6.5um. how do I convert these 8 digited numbers to mm or um? I do understand that for 3D measurements each voxel will represent 6.5*6.5*6.5um^3. I will appreciate any advise on this. Thanks.

Rik 2017-4-24

You need to check if the voxels are indeed cubic, and not another rectangular shape. If they are indeed 6.5*6.5*6.5, then you can simply multiply the number of voxels with the volume per voxel.

All scans should have some metadata (for medical data you can use dicominfo), so you should be able to verify the voxel volume. If there is no metadata, you should dig around in the scanner settings.

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