Magnetic determination of position and orientation

Details Magnetic determination of position and orientation Magnetic determination of position and orientation

A - Human Necessities

61

B

A61B 5/05 (2006.01) A61B 5/06 (2006.01) A61B 5/103 (2006.01) G01R 33/02 (2006.01) A61B 19/00 (2006.01)

Patent

CA 2172619

A magnetic position and orientation determining system uses magnetic fields, desirably comprising uniform fields from Helmholtz coils positioned on opposite sides of a sensing volume and gradient fields generated by the same coils. By monitoring field components detected at the probes during application of these fields, the position and orientation of the probe in the field can be deduced. A representation of the probe can be superposed on a separately acquired image of the subject to show the position and orientation of the probe with respect to the subject.

Un système de détermination magnétique de position et d'orientation utilise des champs magnétiques tels que, de préférence, des champs homogènes ainsi que des champs à gradient produits par des bobines de Hemholtz (34, 36, 38) placées de chaque côté d'un volume de détection. En contrôlant les composantes du champ détectées au niveau des sondes (50) pendant l'application de ces champs, on peut déduire la position et l'orientation de la sonde (50) dans le champ. Par ailleurs, on peut superposer une représentation (108) de la sonde (50) sur une image du sujet obtenue séparément de manière à visualiser la position et l'orientation de la sonde (50) par rapport au sujet.

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