I have a Nifti file, the size of which is 62*62*38. How can I transfer the Nifti file to .mat Matlab file?
This can read NIFTI as well as many other medical image file types into MATLAB arrays, which you can then save as .mat files.
Most medical imaging data can be manipulated effectively using some kind of toolbox, such as SPM. However, if you need to gain access to the raw matrix I've always used NIfTI tools from the Mathworks file exchange site (here).
There are two functions that are relevant here: load_nii and load_untouched_nii. The first function load_nii takes care of situations where the header in the NiFTI contains transformations that haven't been applied to the underlying data matrix. If you know that no such transformations exist, you can use load_untouched_nii to avoid the reslicing being done. Both functions return a structure, and the data matrix is located in the img field of the returned structure.
FreeSurfer has a MATLAB function called "MRIread". It can read NIFTI (.nii, .nii.gz) files into a MATLAB structure, which can then be saved to a MAT file if so desired.
来源：https://stackoverflow.com/questions/29088642/how-to-transfer-nifti-file-into-mat-matlab-file