Just for the sake of completeness:
On Sat, 24 Mar 2007, Ged Ridgway wrote:
> ... I don't know anything about .par/.rec, but DICOM files only (to the best
> of my knowledge) encode 9 DoF voxel-world mappings (they store direction
> cosines in a field called something like ImageOrientationPatient, which can
> be used to create a 3x3 rotation matrix, but nothing is stored which allows
> skewing of the axes). In other words, I would not expect dcm2nii to produce
> NIfTI volumes with 12 DoF voxel-world mappings.
DICOM can encode 3D data with 12 DoF voxel-world mappings in multi-file
data sets. This happens e.g. for SIEMENS CT data, where the difference
vector between two slice center points is not parallel to the slice normal
vector. This results in a skewed stack of 3D slices. However, I have never
seen this for MRI data.
Volkmar
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Volkmar Glauche
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Department of Neurology [log in to unmask]
Universitaetsklinikum Freiburg Phone 49(0)761-270-5331
Breisacher Str. 64 Fax 49(0)761-270-5416
79106 Freiburg http://fbi.uniklinik-freiburg.de/
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