Marker device for x-ray, ultrasound and mr imaging

A - Human Necessities – 61 – L

Patent

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Details

A61L 31/18 (2006.01) A61B 5/055 (2006.01) A61B 6/00 (2006.01) A61B 8/00 (2006.01) A61K 49/00 (2006.01)

Patent

CA 2579914

An imaging marker comprised of glass and iron-containing aluminum microspheres in a gel matrix which shows uniformly good contrast with MR, US and X-Ray imaging The maiker is small and can be easily introduced into tissue through a 12-gauge biopsy needle The concentration of glass microspheres and the size dictate the contrast for US imaging The contrast seen m MRI resulting from susceptibility losses is dictated by the number of iron-containmg aluminum microspheres, while the artifact of the marker also depends on its shape, orientation and echo time By optimizing the size, iron concentration and gel binding, an implantable tissue marker is created which is clearly visible with all three imaging modalities.

L'invention concerne un marqueur d'imagerie comprenant des microsphères d'aluminium contenant du fer dans une matrice de gel et présentant un contraste uniformément bon en imagerie par résonance magnétique, par ultrasons et par rayons X. Ce marqueur est petit et peut être facilement introduit dans un tissu au moyen d'une aiguille de biopsie de calibre 12. La concentration en microsphères de verre et la taille régissent le contraste pour l'imagerie par ultrasons. Le contraste résultant des pertes de susceptibilité observé dans une IRM est régi par le nombre de microsphères d'aluminium contenant du fer, l'artefact du marqueur dépendant également de sa forme, de son orientation et de son temps d'écho. L'optimisation de la taille, de la concentration en fer et de la liaison du gel permet de créer un marqueur tissulaire implantable clairement visible avec ces trois techniques d'imagerie.

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