Standard and nonstandard spaces
The command line interface of ASLPPrep allows resampling of the pre-processed
and computed CBF maps onto other output spaces.
That is achieved using the
--output-spaces argument, where standard and
nonstandard spaces can be inserted.
ASLPrep will reduce the number of output spaces to just spaces listed in
even if other options require resampling the preprocessed data into intermediary spaces.
By default, ASLPrep uses
MNI152NLin2009cAsym as spatial-standardization reference and
output space. Valid template identifiers can be used from the
However, many users will be interested in utilizing a coarse gridding (typically 2 mm isotropic)
of the target template. This can be achieved by applying modifiers to the template identifier,
separated by a
--output-spaces MNI152NLin6Asym:res-2 will generate
ASL and CBF on standard space (
MNI152NLin6Asym) with the template’s 2 mm
--output-spaces accepts identifiers of spatial references
that do not generate standardized coordinate spaces:
anat: can be used to resample data into the individual’s anatomical reference (e.g., the T1w image).
sbrefcan be used to generate ASL/CBF data in their original grid, after head-motion and susceptibility-distortion corrections as well as CBF computation. These keywords are experimental.
Modifiers are not allowed when providing nonstandard spaces.