Detection of ferromagnetic objects approaching a magnet

G - Physics – 01 – V

Patent

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G01V 3/10 (2006.01)

Patent

CA 2481803

An apparatus for detecting a potentially dangerous ferromagnetic object carried inadvertently by a person approaching the magnet of a magnetic resonance imaging system uses the fringe field of the magnet and provides guide members defining a path along which the person is prescribed to pass. The path is generally or approximately parallel to the field at the path. At least one sense coil and generally two sets of sense coils are located on respective sides of the path so that the movement of the ferromagnetic object in the field of the magnet causes a voltage to be generated in the sense coil. The sense coils include vertical coil legs on each side of the path at spaced positions along the path defining a sensing zone having a height approximating the height to be sensed. An electrical measuring device measures the electrical signal and provides a warning indication when the electrical signal exceeds a predetermined value, either by its amplitude or by an integral over the movement of the person within the zone as detected by an independent sensor which senses entry into and exit from the zone.

Cette invention concerne un appareil servant à détecter un objet ferromagnétique potentiellement dangereux porté par inadvertance par un individu s'approchant de l'aimant d'un système (14) d'imagerie par résonance magnétique. Cet appareil utilise le champ de franges (16) de l'aimant et génère des éléments de guidage (11) définissant une trajectoire que l'individu est prié de suivre. Cette trajectoire (11) est sensiblement ou approximativement parallèle au champ au niveau de la trajectoire. Au moins une bobine de détection et habituellement deux ensembles de bobines (12, 13) de détection sont disposés sur les côtés respectifs de la trajectoire (11) de manière que le déplacement de l'objet ferromagnétique dans le champ de l'aimant provoque la génération d'une tension dans la bobine de détection.

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