title: How to convert the filetype from .png to .mha?
body: <p>I am doing brain tumor segmentation with the BTATS2013. I have gotten the test result with the testing dataset of BRATS 2013 which don't have ground truth, so I can't get the Dice, PPV, Sensitivity directly. I want to use <a href="https://www.smir.ch/Home/Browse" rel="nofollow noreferrer">the online platform</a> to evaluate the segmentations, it requires the filetype of input is <code>.mha</code>, but the filetype of segmentations that I get is <code>.png</code>. I don't know how to convert the <code>.png</code> to <code>.mha</code>. Is there anyone can help me to solve the problem, or can you give me some advice of getting the indicators of segmentation? Thanks.</p>