How to convert file format from .mat to .nii format

Dear All

I'm beginner in using mat lab. I don't have much information to do coding by mat lab. I really need you help.

I would like to create nii file from 16 mat files:

1. .nii file from 16 mat files for T2_star (my file name).
2. .nii file from another 16 files for T2 (my 2nd file name).

for slice 1:16;

1. - load mat file.
2. - store it in 3D variable, because my files are 2D matrix.

end save_nii

%% Please send explanation with each step and appreciated your help.

Regards

Dhafer

[Walter Roberson]

What is .nii format? Something to do with National Instruments? But T2 and T2_star are MRS and MRI terms, suggesting that .nii might be a format used by a spectrometer or something like that ?

Answer 1

[Dhafer]

Dear All The following code is to create .nii file from 16mat files.

what I need is to do opiste. Svae .nii file to 16 mat files.

files=dir('*.mat');
A=[10:16 1:9] % this is because the volume not in the right order. 
for f=1:16; 
g=A(f); 
load(files(f).name);
M0vol(:,:,g)= M0; 
t2starvol(:,:,g)=T2star; 
r2starvol(:,:,g)=R2star;

end

nii=make_nii(M0vol); 
save_nii(nii,'N_144_M0.nii');

nii=make_nii(r2starvol); 
save_nii(nii,'N_144_R2star.nii');

nii=make_nii(t2starvol); 
save_nii(nii,'N_144_T2star.nii');

[tahoorasf]

in this line M0vol(:,:,g)= M0; what is M0?

Answer 2

[Dhafer]

Dear All

I have written this code but there is problem with load line! I do not know what is the error?

files=dir('N_144_slice_*.mat');
A=[10:16 1:9] % this is because the volume not in the right order.
for f=1:16;
    g=A(f);
    load(files(f).name);
    M0vol(:,:,g)= M0;
    t2starvol(:,:,g)=T2star;
    r2starvol(:,:,g)=R2star;

end

nii=make_nii(M0vol);
save_nii(nii,'N_144_M0.nii');

nii=make_nii(r2starvol);
save_nii(nii,'N_144_R2star.nii');

nii=make_nii(t2starvol);
save_nii(nii,'N_144_T2star.nii');

[Walter Roberson]

Do you get an error message?

[Dhafer]

yes,

I solved the error message and I really need you help to do the opposite code for me.

The following code is to create .nii file from 16mat files.

what I need is to do opiste. Svae .nii file to 16 mat files.

files=dir('*.mat'); ]
A=[10:16 1:9] % this is because the volume not in the right order. for for f=1:16; 
g=A(f); 
load(files(f).name); 
M0vol(:,:,g)= M0; 
t2starvol(:,:,g)=T2star; 
r2starvol(:,:,g)=R2star;

end

nii=make_nii(M0vol); 
save_nii(nii,'N_144_M0.nii');

nii=make_nii(r2starvol); 
save_nii(nii,'N_144_R2star.nii');

nii=make_nii(t2starvol); 
save_nii(nii,'N_144_T2star.nii');

Your help is appreciated.

Regards

Dhafer