TERMIUM Plus®

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HARMONIC MODEL [2 records]

Record 1 2024-06-14

English

Subject field(s)
  • Medical Imaging
CONT

Unlike the DT [diffusion tensor] model, FBA relies on a spherical harmonic representation of diffusion that can more readily represent complex multi-fiber geometry, allowing for anatomically-informative metrics to be separately estimated for distinct fiber populations within a voxel. Specifically, fixel-based analysis utilizes constrained spherical deconvolution(CSD) to estimate fiber orientation distribution functions(fODFs) within each voxel, and then segments fODFs into directionally distinct lobes associated with distinct fiber populations("fixels") within a voxel.

Key term(s)
  • fixel based analysis

French

Domaine(s)
  • Imagerie médicale

Spanish

Save record 1

Record 2 1997-12-02

English

Subject field(s)
  • Various Proper Names
  • Geophysics
OBS

The Canadian Geomagnetic Reference Field(CGRF) is a mathematical model of the geomagnetic field over Canada. It is produced by carrying out a spherical cap harmonic analysis on numerous observations of the magnetic field made on the ground, at sea, in the air, and a satellite altitudes between 1960 and 1994. The latest CGRF is for 1995, but contains time terms that enable it to be used over the time interval 1960 to 2000.

French

Domaine(s)
  • Appellations diverses
  • Géophysique
OBS

Le Champ de référence géomagnétique du Canada (CGRF) est un modèle mathématique du champ géomagnétique du Canada. Il a été produit grâce à l'analyse des harmoniques de la calotte sphérique à partir des nombreuses observations du champ magnétique qui ont été effectuées au sol, en mer, dans les airs et aux altitudes de satellite entre 1960 et 1994. Le modèle du CGRF le plus récent date de 1995, mais il contient des équations temporelles qui permettent de l'utiliser pour différents intervalles de temps entre 1960 et l'an 2000.

Spanish

Save record 2

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