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dti (version 1.2-0.1)

dkiTensor-methods: Diffusion Kurtosis Imaging (DKI)

Description

These methods estimate, in each voxel, the diffusion kurtosis tensor (and the diffusion tensor) and some scalar indices.

Usage

## S3 method for class 'dtiData':
dkiTensor(object, method=c("CLLS-QP", "CLLS-H", "ULLS") , 
                   mc.cores=setCores(, reprt=FALSE), verbose=FALSE)
  ## S3 method for class 'dkiTensor':
dkiIndices(object, mc.cores=setCores(, reprt=FALSE),
                   verbose=FALSE)

Arguments

object
Object of class "dtiData"
method
Method for tensor estimation. May be "CLLS-QP" for a qudratic programm solution for the constrained optimization (requires package quadprog), "CLLS-H" for a heuristic approximation described in Tabesh et al. (2011), or "
mc.cores
Number of cores to use. Defaults to number of threads specified for openMP, see documentation of package awsMethods. Not yet fully implemented for these methods.
verbose
Verbose mode.

Value

  • An object of class "dkiTensor" or "dkiIndices".

References

A. Tabesh, J.H. Jensen, B.A. Ardekani, and J.A. Helpern, Estimation of tensors and tensor-derived measures in diffusional kurtosis imaging, Magnetic Resonance in Medicine, 65, 823-836 (2011).

E.S. Hui, M.M. Cheung, L. Qi, and E.X. Wu, Towards better MR characterization of neural tissues using directional diffusion kurtosis analysis, Neuroimage, 42, 122-134 (2008).

http://www.wias-berlin.de/projects/matheon_a3/

See Also

dtiData, readDWIdata, dtiData, dkiTensor dkiIndices