To make it more complicated - I have now used Slicer v 3.6.3 on Windows and I got the following feedback, but I got a output file in .nrrd format.

Dicom to Nrrd Converter standard output:

C:/Users/Jacek/.../data.nrrd
ORIGINAL\PRIMARY\M\ND\MOCO\DICO\MOSAIC
Image acquired using a Siemens scanner
Siemens Mosaic format
WARNING: Unknown transfer syntax, assuming little endian. This may cause strange results, such as bizarre b-values and directions



My another question is, I gues we all have more than one subject, is there a way to automatize this conversion using command line?