The method estimates, in each voxel, the coefficients of an expansion of the apparent diffusion cefficient (ADC) with respect to a apherical harmonics orthonormal system from the DWI data contained in an object of class "dtiData".
# S4 method for dtiData
dwiQball(object, what="wODF", order=4, lambda=0, mask=NULL)An object of class "dwiQball".
Object of class "dtiData"
Determines quantity to estimate, coefficients ot the orientation density function (ODF) (what="ODF", what="wODF", what="aODF") or the apparent diffusion
coefficient (ADC) (what="ADC") with respect to spherical harmonics of the up to the specified order.
even integer: maximum order of the sperical harmonics expansion
nonnegative regularization parameter.
optional brain mask
Returns a warning.
Estimate, in each voxel, the coefficients of an expansion of the orientation density function (ODF) or the apparent diffusion coefficient (ADC) with respect to a apherical harmonics orthonormal system. Note that the maxima of the ADC have no direct interpretation as fibre orientations.
Karsten Tabelow tabelow@wias-berlin.de
J\"org Polzehl polzehl@wias-berlin.de
M. Descoteaux, E. Angelino, S. Fitzgibbons and R. Deriche, Regularized, Fast and Robust Analytical Q-Ball Imaging, Magnetic Resonance Methods, 2007, 58, 497-512.
J. Polzehl, K. Tabelow (2019). Magnetic Resonance Brain Imaging: Modeling and Data Analysis Using R. Springer, Use R! series. Doi:10.1007/978-3-030-29184-6.
dtiData,
readDWIdata,
dtiIndices-methods,
medinria,
dtiData,
dtiTensor