That note in the pipeline example code was put there because I don¹t know
how to tell what readout direction was used from the DICOMs and z seems to
be the Siemens default. If someone else does, I¹d be interested in what
field(s) they used.
Gordon, I¹d be a bit surprised here if the shim
On Oct 26, 2014, at 9:21 AM, Glasser, Matthew
glass...@wusm.wustl.edumailto:glass...@wusm.wustl.edu wrote:
That note in the pipeline example code was put there because I donąt know
how to tell what readout direction was used from the DICOMs and z seems to
be the Siemens default. If someone
'Unwarp Dir’ should correspond to the Readout (frequency encoding) direction
for the ‘PreFreeSurferPipeline', in which case is the Z direction (Head - Foot)
for the sagittal T1w/T2w HCP structural acquisitions. Not sure what you mean by
The only comment is that z appears best.” Below is what’s
As for importance, it depends on your application but readout distortion is
typically quite small. Btw, we’ve observed that the scanner re-shimming often
happens between the fieldmap and the structural scans if the scanner operator
is not well-educated for the importance of preventing
