543 results about "Multiple markers" patented technology

A method is provided for automatically classifying text into categories. In operation, a plurality of tokens or features are manually or automatically associated with each category. A weight is then coupled to each feature, wherein the weight indicates a degree of association between the feature and the category. Next, a document is parsed into a plurality of unique tokens with associated counts, wherein the counts are indicative of the number of times the feature appears in the document. A category score representative of a sum of products of each feature count in the document times the corresponding feature weight in the category for each document is then computed. Next, the category scores are sorted by perspective, and a document is classified into a particular category, provided the category score exceeds a predetermined threshold.

A system and method for bracketing a tissue volume (22) and later locating the bracketed tissue volume. The system includes a plurality of markers (30) and a probe (32) and detector (34) for use in locating the markers by providing information usable by a surgeon that is representative of changes in proximity between the probe and the plurality of markers. The markers have various detection characteristics, e.g., they transmit gamma rays, that are detectable by an associated probe and detector. The tissue volume is removed by manipulating a cutting tool based on the proximity information provided by the detector which can be used by the surgeon to define the boundary of the tissue volume. A two-part cutting tool (200) is provided for removing the tissue volume, and a tissue anchor (300) is provided for stabilizing the tissue during removal. The system and method of the invention are particularly useful in bracketing and then removing a tissue volume from amorphous, pliable tissue such as breast tissue.

A marking device for defining the margins and orientation of radiography specimens includes a plurality of visually distinctive markers joined by a base that holds the markers until the markers are secured to a specimen. The base serves as a holder for the individual markers as the markers are secured to a specimen with sutures or staples, at which time the markers are disconnected from the base. One or more markers may be secured to a specimen as needed to define the orientation of the specimen. By securing markers to specific locations on a specimen, a surgeon can indicate to radiologists and pathologists the specimen's orientation in the body before removal, thus aiding in future study of the specimen. Since the markers are made either wholly or partially from radiopaque material, the markers are visible when radiographed.

Methods and systems for registering three-dimensional (3D) CT image data with two-dimensional (2D) fluoroscopic image data using a plurality of markers are disclosed. In the methods and systems, a lateral angle and a cranial angle are searched for and a roll angle is computed. 3D translation coordinates are also computed. The calculated roll angle and 3D translation coordinates are computed for a predetermined number of times successively. After performing the calculations, the 3D CT image data is overlaid on the 2D fluoroscopic image data based on the lateral angle, the cranial angle, the roll angle, and the 3D translation coordinates.

The invention is directed to a polymer stent with one or more markers such that when the stent is placed within a lumen, the markers can be detected external to the body. The markers can also be used to monitor the stent position after placement and absorption of bioabsorbable stents. Further, the stent may comprise two markers used to determine the diameter of the stent in real time. It is also contemplated that the stent may comprise at least three markers. The use of at least three markers enables the three dimensional orientation of the stent to be determined at any time. The stent may also comprise markers such that the markers are located in regions with different in vivo lifetimes. It is also contemplated that the pattern and material type of markers on the stent may be used to determine the type of stent within a lumen or box.

A marker navigation device for determining and / or tracking a location of a marker device is provided. The marker device is attachable to an object, said marker device including a plurality of markers having known dimensions and being in a known positional relationship relative to each other. The marker navigation device includes: a detection device operative to detect signals emitted by or reflected from the plurality of markers, wherein the detection device is formed such that in first locations of the detection device relative to the marker device, detection of signals from one marker of the plurality of markers is restricted or impossible due to a location of another marker of the plurality of markers. In second locations of the detection device relative to the marker device, the plurality of markers are detectable by the detection device. The navigation device also includes a processing device communicatively coupled to the detection device and configured to calculate the first locations based on the relative locations of individual markers of the plurality of markers and based on the known dimensions of the plurality of markers, and calculate an actual location of the marker device relative to the detection device based on detected signals from at least one marker of the plurality of markers, the known locations of the plurality of markers relative to each other, and the known dimensions of the plurality of markers. The processing device also can determines whether the actual location of the marker device is one of the first locations. A warning device is communicatively coupled to the processing device and operative to output a warning signal when the actual relative location is one of the first relative locations.

A system for obtaining coordinate data of a source and detector instrument are described. The system includes a marker assembly having a plurality of markers with a particular geometry, and an energy source for targeting the plurality of markers with energy packets. The system further includes a detector for detecting energy packets after the plurality of markers have interacted therewith, and an image device for forming image data of the plurality of markers from the energy packets detected by the detector. A calibration module for utilizes the particular geometry of the plurality of markers and the image data to non-iteratively determine coordinate data.

Porous particles are prepared using a first water-in-oil emulsion comprising a first marker material in a first aqueous phase that is dispersed in a first oil phase containing a polymer and a first organic solvent, and a second water-in-oil emulsion comprising a second marker material in a second aqueous phase that is dispersed in a second oil phase. The first and second marker materials are detectably different. The two water-in-oil emulsions can be used to form a third water-in-oil emulsion containing distinct droplets of the first and second aqueous phases. This third water-in-oil emulsion is dispersed in a third aqueous phase containing a surface stabilizing agent to form a water-in-oil-in-water emulsion containing droplets of the third water-in-oil emulsion. The organic solvents are removed from the water-in-oil-in-water emulsion to form porous particles comprising first and second discrete pores that are isolated from each other. The first marker material is present within the first discrete pores, and the second marker material is present within the second discrete pores.