Information about phase-encoding using mrinfo


Hello dear Mrtrix experts,

How can one find information about phase-encoding when the output of mrinfo is this:
Image: “dwi.mif”

Dimensions: 128 x 128 x 60 x 34
Voxel size: 1.75 x 1.75 x 2 x ?
Data strides: [ -1 -2 3 4 ]
Format: MRtrix
Data type: unsigned 16 bit integer (little endian)
Intensity scaling: offset = 0, multiplier = 1
Transform: 0.9958 -0.03817 -0.08324 -103.5
0.05144 0.9852 0.1636 -116.5
0.07576 -0.1671 0.983 24.54
EchoTime: 0.059779
FlipAngle: 90
RepetitionTime: 9.02153
command_history: mrconvert “/source/DICOM” “dwi.mif” (version=3.0_RC3-51-g52a2540d)
comments: Anonymous Female 1958 (ANONU9TT1D1LM) [MR] Reg - WIP DTI 32 tra SENSE
study: MR Kopf 3D nativ [ ORIGINAL PRIMARY M_SE M SE ]
DOS: 21/10/2017 22:48:30
dw_scheme: 0,0,0,0
[34 entries] 0.49999761581420898,0.49999761581420898,-0.70711016654968262,800

mrtrix_version: 3.0_RC3-51-g52a2540d

Shouldn’t there also be a “PhaseEncodingDirection” line? If so, how come I cannot seem to get it with my data?



Hi Sabina,

Sorry for the delay in responding – ISMRM and all that…

Only if that information was present in the DICOM headers. Currently, it seems only Siemens actually store that information – at least in a format that we can decipher. I’m guessing your data are not Siemens…?

If they are Siemens, I note that this seems to be a WIP, so probably not a product sequence? Also, the data appear to have been anonymised, which can remove some critical information depending on how paranoid your anonymisation program is…

Hope this helps,


Hi Donald,

Thank you for the answer! :slight_smile:
Yes, the data is unfortunately not Siemens, but Philips …at least now I know why some information is not showing.