Opening .img MRI file in Matlab

Hello,

I am trying to open MRI images download from the IBSR database. It is my first time opening binary files and I'm encountering troubles. I know my images are 256x256 on 16 bits. I have tried the following code :

    name = '657_4_14.img';
    fileID = fopen('name');
    slice = fread(fileID, [256 256], 'int16');
    fclose(fileID)

But the returned "slice" is empty.

Any idea?

Thanks