Marker device for X-ray, ultrasound and MR imaging
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United States of America Patent
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Issued Date -
Dec 28, 2006
app pub date -
May 12, 2005
filing date -
May 12, 2005
priority date (Note) -
Abandoned
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Abstract
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 marker 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 in MRI resulting from susceptibility losses is dictated by the number of iron-containing 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.
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