dcm2mnc - phase encore direction information missing

[ileppe]

Hi,
The phase encoding polarity seems to be missing from the mincheader. It's needed for field mapping using phase encode reverse images (often used in dwi and fmri). From what I see, the information is in the dicom header in the CSA Header and is called PhaseEncodingDirectionPositive.
for e.g. if phase encode is COL, a value of 1 means AP, 0 means PA

It would be great to add a mincheader field to report this value and might be a relatively easy addition to this section:

minc-tools/conversion/dcm2mnc/dicom_to_minc.c

Line 802 in e382598

#define CSA_ELEMENT_SIZE (84)

Thanks!