Patents by Inventor Songbai Ji
Songbai Ji 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: 20230320649Abstract: A surgical guidance system has two cameras to provide stereo image stream of a surgical field; and a stereo viewer. The system has a 3D surface extraction module that generates a first 3D model of the surgical field from the stereo image streams; a registration module for co-registering annotating data with the first 3D model; and a stereo image enhancer for graphically overlaying at least part of the annotating data onto the stereo image stream to form an enhanced stereo image stream for display, where the enhanced stereo stream enhances a surgeon’s perception of the surgical field. The registration module has an alignment refiner to adjust registration of the annotating data with the 3D model based upon matching of features within the 3D model and features within the annotating data; and in an embodiment, a deformation modeler to deform the annotating data based upon a determined tissue deformation.Type: ApplicationFiled: May 31, 2023Publication date: October 12, 2023Applicant: The Trustees of Dartmouth CollegeInventors: David W. ROBERTS, Keith D. PAULSEN, Alexander HARTOV, Songbai JI, Xiaoyao FAN
-
Patent number: 11690558Abstract: A surgical guidance system has two cameras to provide stereo image stream of a surgical field; and a stereo viewer. The system has a 3D surface extraction module that generates a first 3D model of the surgical field from the stereo image streams; a registration module for co-registering annotating data with the first 3D model; and a stereo image enhancer for graphically overlaying at least part of the annotating data onto the stereo image stream to form an enhanced stereo image stream for display, where the enhanced stereo stream enhances a surgeon's perception of the surgical field. The registration module has an alignment refiner to adjust registration of the annotating data with the 3D model based upon matching of features within the 3D model and features within the annotating data; and in an embodiment, a deformation modeler to deform the annotating data based upon a determined tissue deformation.Type: GrantFiled: September 27, 2021Date of Patent: July 4, 2023Assignee: The Trustees of Dartmouth CollegeInventors: David W. Roberts, Keith D. Paulsen, Alexander Hartov, Songbai Ji, Xiaoyao Fan
-
Patent number: 11406471Abstract: This invention provides a hand-held stereovision (HHS) system that is an efficient, accurate, and radiation-free imaging device to acquire intraoperative profiles of the exposed spine in prone position. The reconstructed intraoperative stereovision surfaces (iSV) are registered with preoperative CT (pCT; supine position) in a nonrigid fashion to generate updated CT images (uCT) and correct for vertebral posture and alignment changes. Updated CT images are uploaded to a commercial navigation system for surgical navigation.Type: GrantFiled: October 7, 2019Date of Patent: August 9, 2022Assignee: The Trustees of Dartmouth CollegeInventors: Keith D. Paulsen, Xiaoyao Fan, Songbai Ji, Sohail K. Mirza
-
Publication number: 20220007991Abstract: A surgical guidance system has two cameras to provide stereo image stream of a surgical field; and a stereo viewer. The system has a 3D surface extraction module that generates a first 3D model of the surgical field from the stereo image streams; a registration module for co-registering annotating data with the first 3D model; and a stereo image enhancer for graphically overlaying at least part of the annotating data onto the stereo image stream to form an enhanced stereo image stream for display, where the enhanced stereo stream enhances a surgeon's perception of the surgical field. The registration module has an alignment refiner to adjust registration of the annotating data with the 3D model based upon matching of features within the 3D model and features within the annotating data; and in an embodiment, a deformation modeler to deform the annotating data based upon a determined tissue deformation.Type: ApplicationFiled: September 27, 2021Publication date: January 13, 2022Inventors: David W. ROBERTS, Keith D. PAULSEN, Alexander HARTOV, Songbai JI, Xiaoyao FAN
-
Patent number: 11129562Abstract: A surgical guidance system has two cameras to provide stereo image stream of a surgical field; and a stereo viewer. The system has a 3D surface extraction module that generates a first 3D model of the surgical field from the stereo image streams; a registration module for co-registering annotating data with the first 3D model; and a stereo image enhancer for graphically overlaying at least part of the annotating data onto the stereo image stream to form an enhanced stereo image stream for display, where the enhanced stereo stream enhances a surgeon's perception of the surgical field. The registration module has an alignment refiner to adjust registration of the annotating data with the 3D model based upon matching of features within the 3D model and features within the annotating data; and in an embodiment, a deformation modeler to deform the annotating data based upon a determined tissue deformation.Type: GrantFiled: February 10, 2020Date of Patent: September 28, 2021Assignee: THE TRUSTEES OF DARTMOUTH COLLEGEInventors: David W. Roberts, Keith D. Paulsen, Alexander Hartov, Songbai Ji, Xiaoyao Fan
-
Publication number: 20200170535Abstract: A surgical guidance system has two cameras to provide stereo image stream of a surgical field; and a stereo viewer. The system has a 3D surface extraction module that generates a first 3D model of the surgical field from the stereo image streams; a registration module for co-registering annotating data with the first 3D model; and a stereo image enhancer for graphically overlaying at least part of the annotating data onto the stereo image stream to form an enhanced stereo image stream for display, where the enhanced stereo stream enhances a surgeon's perception of the surgical field. The registration module has an alignment refiner to adjust registration of the annotating data with the 3D model based upon matching of features within the 3D model and features within the annotating data; and in an embodiment, a deformation modeler to deform the annotating data based upon a determined tissue deformation.Type: ApplicationFiled: February 10, 2020Publication date: June 4, 2020Inventors: David W. ROBERTS, Keith D. PAULSEN, Alexander HARTOV, Songbai JI, Xiaoyao FAN
-
Patent number: 10568535Abstract: A surgical guidance system has two cameras to provide stereo image stream of a surgical field; and a stereo viewer. The system has a 3D surface extraction module that generates a first 3D model of the surgical field from the stereo image streams; a registration module for co-registering annotating data with the first 3D model; and a stereo image enhancer for graphically overlaying at least part of the annotating data onto the stereo image stream to form an enhanced stereo image stream for display, where the enhanced stereo stream enhances a surgeon's perception of the surgical field. The registration module has an alignment refiner to adjust registration of the annotating data with the 3D model based upon matching of features within the 3D model and features within the annotating data; and in an embodiment, a deformation modeler to deform the annotating data based upon a determined tissue deformation.Type: GrantFiled: December 2, 2016Date of Patent: February 25, 2020Assignee: THE TRUSTEES OF DARTMOUTH COLLEGEInventors: David W. Roberts, Keith D. Paulsen, Alexander Hartov, Songbai Ji, Xiaoyao Fan
-
Patent number: 9655545Abstract: An apparatus and method for measuring mechanical properties of tissue has a stereo optical surgical microscope with at least one objective lens and at least two digital cameras such that paired images obtained from the digital cameras form stereo pairs, and a digital image processing system adapted to determine surface topography of tissue from the stereo pairs of images and a resulting surface displacement map as a result from indentation. The apparatus has an one indenter; and mechanical modeling routines stored in memory of the image processing system, the mechanical modeling routines capable of constructing computer models of mechanical properties of tissue, and fitting parameters of the computer model to observed surface displacement maps generated by coregistering surface topography of tissue with and without the indenter positioned on the tissue. In an embodiment, fitted parameters of the computer model are displayed and used to adjust a surgical plan.Type: GrantFiled: September 17, 2012Date of Patent: May 23, 2017Assignee: THE TRUSTEES OF DARTMOUTH COLLEGEInventors: Songbai Ji, David W. Roberts, Keith D. Paulsen
-
Publication number: 20170085855Abstract: A surgical guidance system has two cameras to provide stereo image stream of a surgical field; and a stereo viewer. The system has a 3D surface extraction module that generates a first 3D model of the surgical field from the stereo image streams; a registration module for co-registering annotating data with the first 3D model; and a stereo image enhancer for graphically overlaying at least part of the annotating data onto the stereo image stream to form an enhanced stereo image stream for display, where the enhanced stereo stream enhances a surgeon's perception of the surgical field. The registration module has an alignment refiner to adjust registration of the annotating data with the 3D model based upon matching of features within the 3D model and features within the annotating data; and in an embodiment, a deformation modeler to deform the annotating data based upon a determined tissue deformation.Type: ApplicationFiled: December 2, 2016Publication date: March 23, 2017Inventors: David W. ROBERTS, Keith D. PAULSEN, Alexander HARTOV, Songbai JI, Frederic LEBLOND, Brian W. POGUE, Scott C. DAVIS, Dax KEPSHIRE
-
Publication number: 20160321425Abstract: A system for evaluating head injury or personal protective systems uses instrumented helmets or instrumented dummies to transmit accelerometer readings to a computing system having code to determine impact accelerations. The code reads and interpolates separately for pressure and strain between precomputed simulation results nearest the impact in a database of precomputed head impact model simulation results, then combines these to give a combined result. In embodiments, the precomputed result includes strain on neural tracts, a pressure map, or both strain and pressure map. A method of evaluating an impact includes transmitting accelerometer readings from instrumented helmets or dummies to a computing system upon impact; determining angle and acceleration of the impact from the readings; reading and interpolating between precomputed simulation result in the database of strain and pressure simulation results nearest in angle and acceleration to the impact; and displaying information from the simulation.Type: ApplicationFiled: July 13, 2016Publication date: November 3, 2016Inventors: Songbai Ji, Wei Zhao
-
Patent number: 9456200Abstract: A system for, and method of, extracting a surface profile from a stereo pair of images obtained at an arbitrary setting S of an optical system, includes determining surface profile reconstruction parameters for images obtained with the optical system at a reference setting So of the optical system; determining warping parameters for a digital image processor for warping images obtained with the optical system at the arbitrary setting S into images corresponding to the reference setting So; obtaining the stereo pair of images from at least one camera of the optical system; warping the stereo pair of images into images corresponding to the reference setting So, and using the surface profile reconstruction parameters to determine the surface profile. In a particular embodiment, the surface profile is passed to a computer model of tissue deformation and used to determine an intra-surgery location of a tumor or other anatomic feature of tissue.Type: GrantFiled: January 4, 2013Date of Patent: September 27, 2016Assignee: THE TRUSTEES OF DARTMOUTH COLLEGEInventors: Songbai Ji, Xiaoyao Fan, Keith D. Paulsen, David W. Roberts, Alex Hartov
-
Patent number: 9336592Abstract: A system and method for determining intraoperative locations of a lesion in tissue from lesion locations determined in preoperative imaging includes determining three dimensional locations of surface features of the organ in the preoperative images. A preoperative surface map is extracted from stereo images annotated with surface features from preoperative images. An intraoperative surface map of the organ is extracted from stereo images, and surface features are identified in the stereo images corresponding to surface features annotated into the preoperative surface map. Three dimensional displacements of the surface features are determined and used to constrain a computer model of deformation of the organ. In embodiments, the model of deformation is adapted or constrained to model locations and dimensions of surgical cavities using an optical flow method and/or locations of surgical instruments in the organ. The model of deformation is used to determine intraoperative locations for the lesion.Type: GrantFiled: February 1, 2013Date of Patent: May 10, 2016Assignee: THE TRUSTEES OF DARTMOUTH COLLEGEInventors: Xiaoyao Fan, David W. Roberts, Keith D. Paulsen, Songbai Ji, Alex Hartov
-
Patent number: 9179888Abstract: A method for providing patient registration without fiducials comprises the steps of: spatially placing an ultrasound image of a patient randomly at different starting positions relative to a preoperative image; creating an independent registration corresponding to each different starting positions, by optimizing a spatial transformation between the preoperative image and the ultrasound image to provide a first batch of registrations; executing a second registration to fine-tune the alignment between the preoperative image and the ultrasound image; and concatenating the spatial transformation to obtain spatial transformation between the patient in an operating room and a corresponding preoperative image.Type: GrantFiled: August 27, 2010Date of Patent: November 10, 2015Assignee: Dartmouth CollegeInventors: Songbai Ji, David W. Roberts, Alex Hartov, Keith D. Paulsen
-
Patent number: 9098904Abstract: A system and methods are presented for emulating the appearance of prominent features captured in ultrasound through directional dilation of a magnetic resonance gradient image along a direction determined by the relative ultrasound scan-head location with respect to the magnetic resonance gradient image in order to improve the robustness and reliability of registration.Type: GrantFiled: November 15, 2011Date of Patent: August 4, 2015Assignee: Dartmouth CollegeInventors: Songbai Ji, David W. Roberts, Alex Hartov, Keith D. Paulsen
-
Publication number: 20150080766Abstract: A system for evaluating head injury uses instrumented helmets to transmit accelerometer readings to a computing system configured with machine readable code to determine angle and acceleration of impacts. The system has code to compare the angle and acceleration of the impact to thresholds and read at least one precomputed simulation result corresponding to entries near the impact in a database of precomputed head impact model simulations; and for displaying interpolations from the precomputed simulation result. In particular embodiments, the simulation result includes strain on neural tracts.Type: ApplicationFiled: September 18, 2014Publication date: March 19, 2015Inventors: Songbai Ji, Wei Zhao
-
Publication number: 20140369584Abstract: A system and method for determining intraoperative locations of a lesion in tissue from lesion locations determined in preoperative imaging includes determining three dimensional locations of surface features of the organ in the preoperative images. A preoperative surface map is extracted from stereo images annotated with surface features from preoperative images. An intraoperative surface map of the organ is extracted from stereo images, and surface features are identified in the stereo images corresponding to surface features annotated into the preoperative surface map. Three dimensional displacements of the surface features are determined and used to constrain a computer model of deformation of the organ. In embodiments, the model of deformation is adapted or constrained to model locations and dimensions of surgical cavities using an optical flow method and/or locations of surgical instruments in the organ. The model of deformation is used to determine intraoperative locations for the lesion.Type: ApplicationFiled: February 1, 2013Publication date: December 18, 2014Inventors: Xiaoyao Fan, David W. Roberts, Keith D. Paulsen, Songbai Ji, Alex Hartov
-
Publication number: 20140371600Abstract: An apparatus and method for measuring mechanical properties of tissue has a stereo optical surgical microscope with at least one objective lens and at least two digital cameras such that paired images obtained from the digital cameras form stereo pairs, and a digital image processing system adapted to determine surface topography of tissue from the stereo pairs of images and a resulting surface displacement map as a result from indentation. The apparatus has an one indenter; and mechanical modeling routines stored in memory of the image processing system, the mechanical modeling routines capable of constructing computer models of mechanical properties of tissue, and fitting parameters of the computer model to observed surface displacement maps generated by coregistering surface topography of tissue with and without the indenter positioned on the tissue. In an embodiment, fitted parameters of the computer model are displayed and used to adjust a surgical plan.Type: ApplicationFiled: September 17, 2012Publication date: December 18, 2014Inventors: Songbai Ji, David W. Roberts, Keith D. Paulsen
-
Publication number: 20140362186Abstract: A system for, and method of, extracting a surface profile from a stereo pair of images obtained at an arbitrary setting S of an optical system, includes determining surface profile reconstruction parameters for images obtained with the optical system at a reference setting So of the optical system; determining warping parameters for a digital image processor for warping images obtained with the optical system at the arbitrary setting S into images corresponding to the reference setting So; obtaining the stereo pair of images from at least one camera of the optical system; warping the stereo pair of images into images corresponding to the reference setting So, and using the surface profile reconstruction parameters to determine the surface profile. In a particular embodiment, the surface profile is passed to a computer model of tissue deformation and used to determine an intra-surgery location of a tumor or other anatomic feature of tissue.Type: ApplicationFiled: January 4, 2013Publication date: December 11, 2014Applicant: THE TRUSTEES OF DARTMOUTH COLLEGEInventors: Songbai Ji, Xiaoyao Fan, Keith D. Paulsen, David W. Roberts, Alex Hartov
-
Publication number: 20140056498Abstract: A system and methods are presented for emulating the appearance of prominent features captured in ultrasound through directional dilation of a magnetic resonance gradient image along a direction determined by the relative ultrasound scan-head location with respect to the magnetic resonance gradient image in order to improve the robustness and reliability of registration.Type: ApplicationFiled: November 15, 2011Publication date: February 27, 2014Applicant: Dartmouth CollegeInventors: Songbai Ji, David W. Roberts, Alex Hartov, Keith D. Paulsen
-
Publication number: 20140044333Abstract: A registration framework is presented that registers volumetric breast images captured before surgery with intraoperative surface images. The framework may be implemented using either image-based or model-based registration techniques. The method contains the steps of: identifying an air/tissue boundary from a volumetric image created at a first time; processing the volumetric image with an image filter to emphasize the air/tissue boundary; and registering a surface optically scanned image, with the filtered volumetric image, where the surface optically scanned image is created at a second time.Type: ApplicationFiled: February 17, 2012Publication date: February 13, 2014Applicant: Dartmouth CollegeInventors: Richard J. Barth, JR., Songbai Ji, Keith D. Paulsen, Matthew J. Pallone