Anisotropic Power Maps: A diffusion contrast to reveal low anisotropy tissues from HARDI data.
Flavio Dell'Acqua 1,2 , Luis Lacerda 1 , Marco Catani 3 , and Andrew Simmons 1,2
Dept of Neuroimaging, King's College London,
Institute of Psychiatry, London, United Kingdom,
Biomedical Research Centre for Mental Health and
Biomedical Research Unit for Dementia, King's College
London, Institute of Psychiatry, London, United Kingdom,
of Forensics and Neurodevelopmental Sciences, King's
College London, Institute of Psychiatry, London, United
All the anisotropy information in a HARDI signal is
captured by the spherical harmonic coefficients of even
order l ≥ 2. By measuring the total power of these
coefficients it is possible to obtain an absolute
measure of how much anisotropy information is available
in each HARDI signal or a measure of the total
anisotropic power (AP). This index can be use to better
quantify and discriminate low anisotropy regions from
CSF regions or noise. This measure is entirely model
independent, robust to noise and can be easily applied
on a large number of existing datasets.
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