From dicom to png image

Please, How can I convert from dicom image to png image or any extension ?
or How can I convert from dicom image to base64?

Thanks a lot

edit: I found that there is a solution in 
https://github.com/FNNDSC/ami/blob/master/src/models/models.frame.js#L203
but I can't merge it to viewers_uploadexample
Can anyone help me?