Hey Win,
I understand that you want to find mean image of 12 nifti files and correlate them.
To find the mean image from a set of 12 nifti files and then correlate this mean image with each individual nifti image, you can follow these steps using MATLAB:
1. Load the NIfTI files: Use the `load_nii` function from the nifti toolbox or any other suitable method to load the 12 nifti files into MATLAB. This will give you access to the image data and associated metadata.
2. Calculate the mean image: Take the average of the image data across the 12 nifti files using the `mean` function. This will give you the mean image.
3. Correlate the mean image with each individual image: Iterate through each of the 12 nifti files and use the `corrcoef` function to calculate the correlation coefficient between the mean image and each individual image. This will give you a measure of the correlation between the mean image and each image.
Here's a sample code snippet to illustrate these steps:
% Load the 12 NIfTI files
niftiFiles = cell(12, 1);
for i = 1:12
niftiFiles{i} = load_nii(sprintf('file%d.nii', i)); % Replace with the actual file names
end
% Calculate the mean image
meanImage = zeros(size(niftiFiles{1}.img));
for i = 1:12
meanImage = meanImage + double(niftiFiles{i}.img);
end
meanImage = meanImage / 12;
% Correlate the mean image with each individual image
correlationCoefficients = zeros(12, 1);
for i = 1:12
currentImage = double(niftiFiles{i}.img);
correlationCoefficients(i) = corrcoef(meanImage(:), currentImage(:));
end
In this example, make sure to replace `'file%d.nii'` with the actual file name pattern for your 12 nifti files. The code assumes that the nifti files have the same dimensions and spatial orientation.
After running this code, the `meanImage` variable will contain the mean image, and the `correlationCoefficients` variable will contain the correlation coefficients between the mean image and each individual image.
Note that you may need to adjust the code based on the specific structure and properties of your nifti files or use alternative functions/libraries for nifti file handling if you're not using the nifti toolbox.
You may refer to the following link for further information:
Thanks,
Best Regards
Aditya Kaloji
