dtiData-class {dti}R Documentation

Class "dtiData"

Description

Diffusion Weighted Image (DWI) Data

Objects from the Class

Objects can be created by calls of function dtiData.

Slots

.Data:
Object of class "list" with component
si
4D integer array of image values. Dimension c(ddim,ngrad)
level:
Object of class "numeric" minimal valid s0-level. No evaluation will be performed for voxel with s0-values less than level.
btb:
Object of class "matrix" matrix of dimension c(6,ngrad) obtained from gradient directions.
ngrad:
Object of class "integer" number of gradients (including zero gradients)
s0ind:
Object of class "integer" index of zero gradients within sequence 1:ngrad
replind:
Object of class "integer" index (identifier) of unique gradient directions. Used to charactreize replications in the gradient design by identical indices. length is ngrad
ddim:
Object of class "integer" dimension of original image cubes. Integer vector of length 3.
ddim0:
Object of class "integer" dimension of subcube defined by xind, yind and zind.
xind:
Object of class "integer" index for subcube definition in x-direction
yind:
Object of class "integer" index for subcube definition in y-direction
zind:
Object of class "integer" index for subcube definition in z-direction
voxelext:
Object of class "numeric" voxel extensions in x-, y- and z-direction. vector of length 3.
orientation:
Object of class "integer" vector of length 3. Orientation of data according to AFNI convention.
source:
Object of class "character" name of the imgfile used to create the data.

Extends

Class "list", from data part. Class "dti", directly. Class "vector", by class "list", distance 2.

Methods

dti.smooth
signature(object = "dtiData"): Create estimates of diffusion tensors in each voxel using structural adaptive spatial smoothing.
dtiTensor
signature(object = "dtiData"): Create estimates of diffusion tensors in each voxel.
plot
signature(x = "dtiData"): not yet implemented

Author(s)

Karsten Tabelow tabelow@wias-berlin.de, J"org Polzehl polzehl@wias-berlin.de

References

K. Tabelow, J. Polzehl, H.U. Voss, and V. Spokoiny. Diffusion Tensor Imaging: Structural adaptive smoothing, NeuroImage 39(4), 1763-1773 (2008).

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

See Also

dtiData,dtiTensor, dti.smooth, dti, dtiTensor, dtiIndices

Examples

showClass("dtiData")
## Not run: demo(dti_art)

[Package dti version 0.5-4 Index]