How can I control the voxel size using 'imwrite'?

Hello All,

I have an input tiff file image that has 342 slices, and I would like to extract each slice individually and save as a separate file.

% x = imread("inputTiffFile.tif", 100);
% imwrite(x, "slice_100.tif");

% x = imread("inputTiffFile.tif", 163);
% imwrite(x, "slice_163.tif");

However, I have one problem: The voxel spacing in the input image is [1, 1, 1], but the voxel spacing after using 'imwrite' is changed to [0.352778, 0.352778, 1]. I require the voxel spacing to be same as input.

Any inputs on how to avoid this change in voxel size would be very helpful.

Thanks,

Answer 1

[Ayush Modi]

Hi Harsha,

To avoid the change in voxel size when using the "imwrite" function in MATLAB, you can specify the resolution of the output image using the 'Resolution' name-value pair argument. Here's an example:

imwrite(x, "slice_100.tif", 'Resolution', [1, 1, 1]);
% Note - [1, 1, 1] specifies that the voxel spacing should be the same as the input image.

Please refer to the following MathWorks documentation for more information on the “imwrite” function and 'Resolution' name-value pair argument:

https://www.mathworks.com/help/matlab/ref/imwrite.html#:~:text=Resolution%20%E2%80%94%20X%2D%20and%20Y%2Dresolution

Hope this helps!