Main.TensorIndices (r1.1 vs. r1.2)
Diffs

 <<O>>  Difference Topic TensorIndices (r1.2 - 27 Feb 2008 - KristiClark)

META TOPICPARENT KristiClark
-- KristiClark - 21 Feb 2008
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>		 Summary of equations: tensor_indices.doc

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META FILEATTACHMENT tensor_indices.doc attr="" comment="" date="1204099327" path="tensor_indices.doc" size="48128" user="kclark" version="1.1"

 <<O>>  Difference Topic TensorIndices (r1.1 - 21 Feb 2008 - KristiClark)
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META TOPICPARENT KristiClark
-- KristiClark - 21 Feb 2008

tensor_indices

Purpose

Computes a variety of scalar indices from the eigenvectors & eigenvalues.

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Usage: ./tensor_indices input4D.img [optional outputs]
Note: Overwrite permission for the output is assumed.

-f FA.img Fractional anisotropy
-r RA.img Relative anisotropy
-m MD.img Mean diffusivity
-t1 tinv1.img First tensor invariant (sum of eigenvalues)
Note: this is also called the trace
-t2 tinv2.img Second tensor invariant
Tensor invariants described in Basser, 1997
-t3 tinv3.img Third tensor invariant (product of eigenvalues)
-j Joutput.img J metric (Bahn, 1999)
square root of 2nd tensor invariant divided by 3
-k Koutput.img K metric (Bahn, 1999)
2nd tensor invariant divided by 1st tensor invariatn
-gm geom.img Geometric mean of eigenvalues
-h harmonic.img Harmonic mean of eigenvalues
-vr VRoutput.img Volume ratio
-vf VFoutput.img Volume fraction
-cv CVoutput.img Coefficient of variation of the eigenvalues
-cl Clinear.img Describes how much the diffusion tensor is cigar-like
-cp Cplanar.img Describes how much the diffusion tensor is planar
-cs Cspherical.img Describes how much the diffusion tensor is spherical
-ca Canisotropy.img Ca=Cl+Cp=1-Cs (Westin et al., 1997)

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Topic: TensorIndices . { View | Diffs | r1.2 | > | r1.1 | More }

Revision r1.1 - 21 Feb 2008 - 04:40 - KristiClark
Revision r1.2 - 27 Feb 2008 - 08:04 - KristiClark