tract_querier.tensor.scalar_measures¶

Functions

`tract_querier.tensor.scalar_measures.axial_diffusivity`(evals)	Taken from dipy/reconst/dti.py
`tract_querier.tensor.scalar_measures.eigenvalues`(...)	Eigenvalues of the tensors
`tract_querier.tensor.scalar_measures.fractional_anisotropy`(...)	Fractional Anisotropy (Basser et al.) measure computed as
`tract_querier.tensor.scalar_measures.fractional_anisotropy_from_eigenvalues`(evals)	Taken from dipy/reconst/dti.py
`tract_querier.tensor.scalar_measures.geodesic_anisotropy`(evals)	Taken from dipy/reconst/dti.py
`tract_querier.tensor.scalar_measures.mean_diffusivity`(evals)	Taken from dipy/reconst/dti.py
`tract_querier.tensor.scalar_measures.radial_diffusivity`(evals)	Taken from dipy/reconst/dti.py
`tract_querier.tensor.scalar_measures.tensor_contraction`(...)	Return the contraction of each tensor pair
`tract_querier.tensor.scalar_measures.tensor_det`(...)	Determinant of a tensor array
`tract_querier.tensor.scalar_measures.tensor_trace`(...)	Trace of each tensor
`tract_querier.tensor.scalar_measures.volume_fraction`(...)	Volume Fraction (Basser et al.) measure computed as:

Anisotropy measures from tensor operations

tract_querier.tensor.scalar_measures.fractional_anisotropy(tensor_array)[source]¶: Fractional Anisotropy (Basser et al.) measure computed as

$FA = \sqrt{\frac {3(mn \cdot I - T) : (mn \cdot I - T)} {2(T : T)}} mn = Tr(T) / 3$

tract_querier.tensor.scalar_measures.volume_fraction(tensor_array)[source]¶: Volume Fraction (Basser et al.) measure computed as:

$VF = 1 - \frac{|T|} {(Tr(T) / 3.)^3}$

tract_querier.tensor.scalar_measures.eigenvalues(tensor_array)[source]¶: Eigenvalues of the tensors

tract_querier.tensor.scalar_measures.tensor_det(tensor_array)[source]¶: Determinant of a tensor array

tract_querier.tensor.scalar_measures.tensor_trace(tensor_array)[source]¶: Trace of each tensor

tract_querier.tensor.scalar_measures.tensor_contraction(tensor_array_1, tensor_array_2)[source]¶: Return the contraction of each tensor pair