Patents by Inventor Jian-Feng Chen

Jian-Feng Chen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20080137664
    Abstract: An alternating scheduling algorithm is useful in a mesh network. Transmissions are scheduled along a branch in a tree structure such that simultaneous transmissions occur only in non-adjacent layers along the branch. In a disclosed example, every other layer is grouped into a set of layers such that the sets are mutually exclusive and the sets only include non-adjacent layers. One example includes designating one set of layers as the even layers and another set as odd layers. A scheduler schedules transmissions on the layers such that simultaneous transmissions along a branch occur only on layers within one of the sets while transmissions on the other set along the same branch are prevented. The sets of layers selected for transmission are alternated each subsequent scheduling window or frame.
    Type: Application
    Filed: December 6, 2006
    Publication date: June 12, 2008
    Inventors: Jian Feng Chen, Cai Xia Chi
  • Patent number: 7050610
    Abstract: A method and system for quantification of strain imaging is disclosed. The method and system comprises performing a motion analysis on the at least two regions of interest. The method and system further includes providing a strain estimate for each of the at least two regions of interest and comparing the strain estimates of each of the at least two regions to quantify the strain for the at least two regions of interest. A system and method in accordance with the present invention provides for strain quantification based on conventional B-mode images. Using this technique, the strain of regions of interest (ROI) defined by users can be determined and quantitative comparisons can be effectively made in real time. The strain quantification can be used to determine tissue's properties and can potentially be applied in breast imaging as well as cardiac imaging.
    Type: Grant
    Filed: April 4, 2001
    Date of Patent: May 23, 2006
    Assignee: Siemens Medical Solutions USA, Inc.
    Inventors: Jian-Feng Chen, Patrick L. Von Behren
  • Patent number: 7033320
    Abstract: Three or four-dimensional ultrasound data acquisition for extended field of view imaging is provided. Multiple volumes are registered with respect to each other and spliced together to form an extended volume. The extended volume is a contiguous volume larger than a volumetric region that a multi-dimensional or wobbler transducer array is capable of imaging without movement. Information representing different volumes is registered with respect to each other by sensing the transducer position associated with each of the different volumes. The position is sensed using a position sensing mechanism, such as magnetic optical or gyroscope measurements. Acoustic data may be used to determine decorrelation of speckle or correlation of features to sense position. After the volumes are registered, any overlapping regions are compounded. The resulting extended field of view volume is displayed and manipulated for viewing by the user.
    Type: Grant
    Filed: August 5, 2003
    Date of Patent: April 25, 2006
    Assignee: Siemens Medical Solutions USA, Inc.
    Inventors: Patrick L. Von Behren, Jian-Feng Chen
  • Publication number: 20050107704
    Abstract: Medical imaging uses cyclical motion analysis. Phase and/or amplitude analysis of variation for spatial locations in a sequence of images over one or more heart cycles is performed. For phase analysis, selected phase information is cyclically isolated as a function of the heart cycle. For example, a sequence of three images is associated with three different times during the heart cycle. In one image, phases over one range are highlighted. In subsequent images, phases over different ranges are highlighted. By showing the sequence of images in a loop with the shifting phase throughout the sequence, wall contractions are easily visualized. For amplitude analysis, information associated with a selected frequency band, such as the constant and fundamental frequency bands, are isolated. Images are then generated in response to the isolated information. The images have reduced speckle content due to the lack of higher order frequency information.
    Type: Application
    Filed: November 14, 2003
    Publication date: May 19, 2005
    Inventors: Patrick Von Behren, Jian-Feng Chen
  • Publication number: 20050033173
    Abstract: Three or four-dimensional ultrasound data acquisition for extended field of view imaging is provided. Multiple volumes are registered with respect to each other and spliced together to form an extended volume. The extended volume is a contiguous volume larger than a volumetric region that a multi-dimensional or wobbler transducer array is capable of imaging without movement. Information representing different volumes is registered with respect to each other by sensing the transducer position associated with each of the different volumes. The position is sensed using a position sensing mechanism, such as magnetic optical or gyroscope measurements. Acoustic data may be used to determine decorrelation of speckle or correlation of features to sense position. After the volumes are registered, any overlapping regions are compounded. The resulting extended field of view volume is displayed and manipulated for viewing by the user.
    Type: Application
    Filed: August 5, 2003
    Publication date: February 10, 2005
    Inventors: Patrick Von Behren, Jian-Feng Chen
  • Publication number: 20040191319
    Abstract: A process for the production of a microparticle or a nanoparticle of a chemical compound comprising the steps of providing a solution of said chemical compound in a first liquid; providing a second liquid in which said chemical compound is insoluble or substantially insoluble; combining said liquids in a region of high shear thereby causing formation of said particles; and isolating said particles of said compound. The processing time of a coacervation style process can be reduced and the yield can be substantially increased both by control of the precipitation step which allows for desolvation step to be dispensed with leading to significant process time reduction. The invention also provides a molecular mixing unit comprising an outer body defining a mixing zone; a shear means to provide shear liquid in said mixing zone; at least one fluid inlet means for a first liquid; at least one fluid inlet means for a second liquid and a fluid outlet means.
    Type: Application
    Filed: May 17, 2004
    Publication date: September 30, 2004
    Inventors: Sung Lai Jimmy Yun, Jian Feng Chen
  • Patent number: 6728394
    Abstract: Method of dynamically measuring movement of objects is disclosed which uses image processing. In a first step a sequence of images is received and stored. Then, at least a first and second reference point within a first image is determined and identification areas around those reference points are defined. Within a sequential image a search area around the predefined reference points which best match the identification area is searched to determine the displacement of the reference point.
    Type: Grant
    Filed: February 14, 2000
    Date of Patent: April 27, 2004
    Assignee: Siemens Medical Solutions USA, Inc.
    Inventors: Jian-Feng Chen, Jin Kim
  • Patent number: 6558324
    Abstract: A region of interest (ROI) of a patient's body is repeatedly scanned using an ultrasound transducer array. Data sets representing an image property, such as intensity, from portions of the ROI are used to calculate a representation of the displacement profile within the ROI at different stress levels. From the displacement profile, a function of strain is also preferably calculated. According to one aspect of the invention, a data set representing an estimate of the elasticity profile within the ROI is color-coded and is displayed along with a B-mode display in a single, overlaid display. According to another aspect of the preferred embodiment of the invention, the display of elasticity is adaptively persisted as a function of, for example, a measure of image quality. The invention also provides an on-screen guide that indicates to a user a measure of quality of each of a series of estimated displacement data sets.
    Type: Grant
    Filed: November 20, 2001
    Date of Patent: May 6, 2003
    Assignee: Siemens Medical Solutions, Inc., USA
    Inventors: Patrick L. Von Behren, Dong-Cyuan Liu, Jian-Feng Chen
  • Publication number: 20020178833
    Abstract: A method and system for quantification of strain imaging is disclosed. The method and system comprises performing a motion analysis on the at least two regions of interest. The method and system further includes providing a strain estimate for each of the at least two regions of interest and comparing the strain estimates of each of the at least two regions to quantify the strain for the at least two regions of interest. A system and method in accordance with the present invention provides for strain quantification based on conventional B-mode images. Using this technique, the strain of regions of interest (ROI) defined by users can be determined and quantitative comparisons can be effectively made in real time. The strain quantification can be used to determine tissue's properties and can potentially be applied in breast imaging as well as cardiac imaging.
    Type: Application
    Filed: April 4, 2001
    Publication date: December 5, 2002
    Applicant: Siemens Medical System, Inc
    Inventors: Jian-Feng Chen, Patrick L. Von Behren
  • Patent number: 6468218
    Abstract: A 3-D region of interest (ROI) of a body is imaged, preferably using an ultrasound transducer. The intensity of an echo signal from each of a pattern of pixels within the ROI is measured and stored. The pixels are then grouped into pixel blocks, and the intensity values for the pixels in each sequentially selected current block are compiled in a current histogram. Each current histogram is compared with a reference histogram that corresponds to the distribution of echo signal intensities in a known region of speckle. A structure likelihood value is then computed based on the comparison, where the structure likelihood value indicates how likely it is that the current block corresponds to a structure of interest as opposed to noise. The intensity value for any pixel likely to be noise is preferably scaled down. The scaled intensity values are then projected, preferably using a maximum intensity projection, onto a 2-D display plane, a representation of which is then displayed for a user to see.
    Type: Grant
    Filed: August 31, 2001
    Date of Patent: October 22, 2002
    Assignee: Siemens Medical Systems, Inc.
    Inventors: Jian-Feng Chen, Dong-Chyuan Liu
  • Patent number: 6059727
    Abstract: A 3D image data set representing a volume of material such as human tissue is created using speckle decorrelation techniques to process successive 2D data slices from a moving, standard 1D or 1.5D ultrasound transducer. This permits the use of standard ultrasound machinery, without the use of additional slice-position hardware, to create 3D images without having to modify the machinery or its operation. Similar techniques can be used for special data processing within the imaging system as well to expedite the image acquisition process. Optionally, the image quality of 2D images can be enhanced through the use of multiple 3D data sets derived using the method.
    Type: Grant
    Filed: April 13, 1998
    Date of Patent: May 9, 2000
    Assignee: The Regents of the University of Michigan
    Inventors: J. Brian Fowlkes, Paul L. Carson, Aaron Moskalik, Jian-Feng Chen, Jonathan M. Rubin
  • Patent number: 5876342
    Abstract: A system and method for 3-D ultrasound image registration and 3-D motion estimation. A calibrated 3-D speckle function is first pre-determined for the transducer and the tissue to be scanned. A series of image frames are identified and grouped into 3-D big and small blocks. Blocks representing speckle are identified and then, a full width half maximum value sum-absolute-difference technique is used to obtain an out-of-plane motion estimation based on decorrelation characteristics throughout the volume. For in-plane motion estimation, cross-correlation characteristics between pairs of frames are compared and, using a minimum sum absolute value technique, an estimate of in-plane motion is obtained. Fuzzy logic techniques are then used to obtain more accurate estimates. Finally, the out-of-plane motion estimate is updated based on decorrelation characteristics of the speckle frames used for the in-plane determination using a full width half maximum value technique.
    Type: Grant
    Filed: June 30, 1997
    Date of Patent: March 2, 1999
    Assignee: Siemens Medical Systems, Inc.
    Inventors: Jian-Feng Chen, Lee Weng
  • Patent number: 5638820
    Abstract: An ultrasound system (50) estimates the speed of sound in the tissue (60) under examination. The ultrasound system obtains a series of test images (150) using different estimates of the speed of sound in the body tissue. For each image produced, the ultrasound system computes a function that is indicative of image quality for one or more regions of interest (152) in the test image. The image quality function exhibits a minimum or maximum when computed for a region of interest obtained at a speed of sound substantially equal to a true speed of sound in the tissue. The ultrasound system selects the test image having the minimum or maximum function value and obtains subsequent images of the tissue using the speed of sound used to obtain the test image selected.
    Type: Grant
    Filed: June 25, 1996
    Date of Patent: June 17, 1997
    Assignee: Siemens Medical Systems, Inc.
    Inventors: Jian-Feng Chen, Lin-Xin Yao, Patrick L. Von Behren