The image file formats supported include those of ITK (Insight ToolKit):
Analyze 7.5 (.hdr, .img), Metafile (.mha, .mhd), Gipl (.gipl), VTK image data (.vtk), Dicom
(.dcm), Ge4x, GDCM, Nrrd, Siemens Vision, PNG, BMP, TIFF, JPEG, ... For dicom images
without extensions, please use ``All'' filter.