Detects outliers in a functional imaging series
Uses intensity and motion parameters to infer outliers. If use_norm is True, it computes the movement of the center of each face a cuboid centered around the head and returns the maximal movement across the centers.
>>> ad = ArtifactDetect()
>>> ad.inputs.realigned_files = 'functional.nii'
>>> ad.inputs.realignment_parameters = 'functional.par'
>>> ad.inputs.parameter_source = 'FSL'
>>> ad.inputs.norm_threshold = 1
>>> ad.inputs.use_differences = [True, False]
>>> ad.inputs.zintensity_threshold = 3
>>> ad.run()
Inputs:
[Mandatory]
mask_type: ('spm_global' or 'file' or 'thresh')
Type of mask that should be used to mask the functional data. *spm_global* uses an
spm_global like calculation to determine the brain mask. *file* specifies a brain mask
file (should be an image file consisting of 0s and 1s). *thresh* specifies a threshold
to use. By default all voxelsare used, unless one of these mask types are defined.
norm_threshold: (a float)
Threshold to use to detect motion-related outliers when composite motion is being used
mutually_exclusive: rotation_threshold, translation_threshold
parameter_source: ('SPM' or 'FSL' or 'AFNI' or 'NiPy')
Source of movement parameters
realigned_files: (an existing file name)
Names of realigned functional data files
realignment_parameters: (an existing file name)
Names of realignment parameterscorresponding to the functional data files
rotation_threshold: (a float)
Threshold (in radians) to use to detect rotation-related outliers
mutually_exclusive: norm_threshold
translation_threshold: (a float)
Threshold (in mm) to use to detect translation-related outliers
mutually_exclusive: norm_threshold
zintensity_threshold: (a float)
Intensity Z-threshold use to detection images that deviate from the mean
[Optional]
bound_by_brainmask: (a boolean, nipype default value: False)
use the brain mask to determine bounding boxfor composite norm (worksfor SPM and Nipy -
currentlyinaccurate for FSL, AFNI
global_threshold: (a float, nipype default value: 8.0)
use this threshold when mask type equal's spm_global
ignore_exception: (a boolean, nipype default value: False)
Print an error message instead of throwing an exception in case the interface fails to
run
intersect_mask: (a boolean)
Intersect the masks when computed from spm_global.
mask_file: (an existing file name)
Mask file to be used if mask_type is 'file'.
mask_threshold: (a float)
Mask threshold to be used if mask_type is 'thresh'.
plot_type: ('png' or 'svg' or 'eps' or 'pdf', nipype default value: png)
file type of the outlier plot
save_plot: (a boolean, nipype default value: True)
save plots containing outliers
use_differences: (a list of items which are an implementor of, or can be adapted to
implement, bool or None, nipype default value: [True, False])
Use differences between successive motion (first element)and intensity paramter (second
element) estimates in orderto determine outliers. (default is [True, False])
use_norm: (a boolean, nipype default value: True)
Uses a composite of the motion parameters in order to determine outliers.
requires: norm_threshold
Outputs:
displacement_files: (a file name)
One image file for each functional run containing the voxeldisplacement timeseries
intensity_files: (an existing file name)
One file for each functional run containing the global intensity values determined from
the brainmask
mask_files: (a file name)
One image file for each functional run containing the maskused for global signal
calculation
norm_files: (a file name)
One file for each functional run containing the composite norm
outlier_files: (an existing file name)
One file for each functional run containing a list of 0-based indices corresponding to
outlier volumes
plot_files: (a file name)
One image file for each functional run containing the detected outliers
statistic_files: (an existing file name)
One file for each functional run containing information about the different types of
artifacts and if design info is provided then details of stimulus correlated motion and
a listing or artifacts by event type.
Determines if stimuli are correlated with motion or intensity parameters.
Currently this class supports an SPM generated design matrix and requires intensity parameters. This implies that one must run nipype.algorithms.rapidart.ArtifactDetect and nipype.interfaces.spm.model.Level1Design prior to running this or provide an SPM.mat file and intensity parameters through some other means.
>>> sc = StimulusCorrelation()
>>> sc.inputs.realignment_parameters = 'functional.par'
>>> sc.inputs.intensity_values = 'functional.rms'
>>> sc.inputs.spm_mat_file = 'SPM.mat'
>>> sc.inputs.concatenated_design = False
>>> sc.run()
Inputs:
[Mandatory]
concatenated_design: (a boolean)
state if the design matrix contains concatenated sessions
intensity_values: (an existing file name)
Name of file containing intensity values
realignment_parameters: (an existing file name)
Names of realignment parameters corresponding to the functional data files
spm_mat_file: (an existing file name)
SPM mat file (use pre-estimate SPM.mat file)
[Optional]
ignore_exception: (a boolean, nipype default value: False)
Print an error message instead of throwing an exception in case the interface fails to
run
Outputs:
stimcorr_files: (an existing file name)
List of files containing correlation values