Patents by Inventor Kedar Bhalchandra Khare
Kedar Bhalchandra Khare 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).
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Publication number: 20180365810Abstract: Technologies are generally described to recover diffraction limited amplitude and phase images of objects from single shot image plane hologram data. In some examples, an image processor may receive digital hologram data derived from interference between a reference signal and an unknown object image. The image processor may then attempt to recover a version of the unknown object image by minimizing a cost function associated with the reference signal and the digital hologram data. The cost function may include a data-fit cost component and a constraint cost component, and the image processor may iteratively minimize the cost function by alternately minimizing the data-fit cost component and the constraint cost component.Type: ApplicationFiled: December 12, 2016Publication date: December 20, 2018Applicant: INDIAN INSTITUTE OF TECHNOLOGY DELHIInventors: Kedar Bhalchandra KHARE, Joby Joseph, Mandeep Singh
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Patent number: 9947118Abstract: Techniques described herein are generally related to non-interferometric phase measurements of an optical signal. The various described techniques may be applied to methods, systems, devices or combinations thereof. Some methods for determining phase data of the optical signal may include transmitting the optical signal through a first optical element and obtaining first intensity data at a first focal plane of the first optical element by an optical sensor. Example methods may also include transmitting the optical signal through a second optical element. The second optical element may include a phase transformation mask. Example methods may further include obtaining a second intensity data at a second focal plane of the second optical element by the optical sensor and determining the phase data for the optical signal based on the first intensity data and the second intensity data.Type: GrantFiled: May 27, 2015Date of Patent: April 17, 2018Assignee: INDIAN INSTITUTE OF TECHNOLOGY DELHIInventors: Kedar Bhalchandra Khare, Manoj Kumar Sharma, Paramasivam Senthilkumaran
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Patent number: 9468409Abstract: Systems, methods and non-transitory computer readable media for imaging. The system includes one or more radiation sources and detectors configured to transmit x-ray radiation towards a subject for imaging a dynamic process in a ROI of the subject and to acquire projection data corresponding to the ROI, respectively. The system also includes a computing device operatively coupled to one or more of the radiation sources and the detectors. The computing device is configured to provide control signals for performing one or more reference scans for acquiring reference data from a plurality of angular positions around the subject and for performing one or more tomosynthesis scans using one or more tomosynthesis trajectories for acquiring tomosynthesis data following the onset of the dynamic process. Additionally, the computing device is configured to reconstruct one or more images representative of the dynamic process using the reference data and/or the tomosynthesis data.Type: GrantFiled: November 26, 2013Date of Patent: October 18, 2016Assignee: GENERAL ELECTRIC COMPANYInventors: Bernhard Erich Hermann Claus, Jeffrey Wayne Eberhard, David Allen Langan, Kedar Bhalchandra Khare
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Publication number: 20150346027Abstract: Techniques described herein are generally related to non-interferometric phase measurements of an optical signal. The various described techniques may be applied to methods, systems, devices or combinations thereof. Some methods for determining phase data of the optical signal may include transmitting the optical signal through a first optical element and obtaining first intensity data at a first focal plane of the first optical element by an optical sensor. Example methods may also include transmitting the optical signal through a second optical element. The second optical element may include a phase transformation mask. Example methods may further include obtaining a second intensity data at a second focal plane of the second optical element by the optical sensor and determining the phase data for the optical signal based on the first intensity data and the second intensity data.Type: ApplicationFiled: May 27, 2015Publication date: December 3, 2015Inventors: Kedar Bhalchandra Khare, Manoj Kumar Sharma, Paramasivam Senthilkumaran
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Patent number: 9135682Abstract: Techniques described herein are generally related to high resolution image recovery of objects from digital holograms. The various described techniques may be applied to methods, systems, devices or combinations thereof. Some described methods for recovering an image may include receiving reference beam data that corresponds to a reference interference pattern and receiving hologram data corresponding to an object. The method may also include applying a cost function to the hologram data and the reference beam data to determine the object image data associated with the object. The cost function may include a smoothness constraint applied to the object image data. The cost function can be iteratively reduced to obtain object image data corresponding to the object and the obtained object image data can be processed to recover the image of the object from single shot holograms with image resolution greater than conventional holographic imaging system.Type: GrantFiled: March 15, 2013Date of Patent: September 15, 2015Assignee: Indian Institute of Technology DelhiInventors: Kedar Bhalchandra Khare, Joby Joseph, Samsheerali Pothiyil Thottiparambil
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Patent number: 9055913Abstract: The subject matter disclosed herein relates to X-ray imaging systems, and more specifically to digital X-ray imaging systems. In one embodiment, an imaging system includes an X-ray source configured to emit X-rays. The imaging system also includes an X-ray detector configured to detect the emitted X-rays and produce a corresponding electrical signal. The imaging system also includes a gantry configured to at least partially revolve the X-ray source and the X-ray detector about a primary rotational axis. The X-ray detector is coupled to the gantry so that a diagonal of the X-ray detector is oriented substantially perpendicular to the primary rotational axis.Type: GrantFiled: April 29, 2011Date of Patent: June 16, 2015Assignee: GENERAL ELECTRIC COMPANYInventors: Joseph John Manak, Bernhard Erich Hermann Claus, Jens Rittscher, Hao Lai, Jeffrey Wayne Eberhard, Kedar Bhalchandra Khare, Cyril Riddell, Yves Lucien Trousset
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Publication number: 20140270456Abstract: Techniques described herein are generally related to high resolution image recovery of objects from digital holograms. The various described techniques may be applied to methods, systems, devices or combinations thereof. Some described methods for recovering an image may include receiving reference beam data that corresponds to a reference interference pattern and receiving hologram data corresponding to an object. The method may also include applying a cost function to the hologram data and the reference beam data to determine the object image data associated with the object. The cost function may include a smoothness constraint applied to the object image data.Type: ApplicationFiled: March 15, 2013Publication date: September 18, 2014Inventors: Kedar Bhalchandra Khare, Joby Joseph, Samsheerali Pothiyil Thottiparambil
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Patent number: 8768095Abstract: A signal processing method is provided. The signal processing method includes the steps of generating undersampled data corresponding to an object, determining a variable thresholding parameter based on a composition of the undersampled data, and iteratively determining thresholded coefficients to generate a plurality of coefficients by utilizing the undersampled data, a current solution and the variable thresholding parameter by updating the variable thresholding parameter and the current solution, and reconstructing a data signal using the plurality of coefficients.Type: GrantFiled: August 14, 2009Date of Patent: July 1, 2014Assignee: General Electric CompanyInventors: Kedar Bhalchandra Khare, Christopher Judson Hardy, Kevin Franklin King, Luca Marinelli
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Publication number: 20140153690Abstract: Systems, methods and non-transitory computer readable media for imaging. The system includes one or more radiation sources and detectors configured to transmit x-ray radiation towards a subject for imaging a dynamic process in a ROI of the subject and to acquire projection data corresponding to the ROI, respectively. The system also includes a computing device operatively coupled to one or more of the radiation sources and the detectors. The computing device is configured to provide control signals for performing one or more reference scans for acquiring reference data from a plurality of angular positions around the subject and for performing one or more tomosynthesis scans using one or more tomosynthesis trajectories for acquiring tomosynthesis data following the onset of the dynamic process. Additionally, the computing device is configured to reconstruct one or more images representative of the dynamic process using the reference data and/or the tomosynthesis data.Type: ApplicationFiled: November 26, 2013Publication date: June 5, 2014Applicant: General Electric CompanyInventors: Bernhard Erich Hermann CLAUS, Jeffrey Wayne EBERHARD, David Allen LANGAN, Kedar Bhalchandra KHARE
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Patent number: 8559688Abstract: A signal processing method is presented. The method includes acquiring undersampled data corresponding to an object, initializing a first image solution and a second image solution, determining a linear combination solution based upon the first image solution and the second image solution, generating a plurality of selected coefficients by iteratively updating the first image solution, the second image solution and the linear combination solution and adaptively thresholding one or more transform coefficients utilizing the undersampled data, an updated first image solution, an updated second image solution and an updated linear combination solution, and reconstructing a data signal using the plurality of selected coefficients.Type: GrantFiled: June 30, 2010Date of Patent: October 15, 2013Assignee: General Electric CompanyInventors: Kedar Bhalchandra Khare, Kevin Franklin King, Luca Marinelli, Christopher Judson Hardy
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Publication number: 20120275563Abstract: The subject matter disclosed herein relates to X-ray imaging systems, and more specifically to digital X-ray imaging systems. In one embodiment, an imaging system includes an X-ray source configured to emit X-rays. The imaging system also includes an X-ray detector configured to detect the emitted X-rays and produce a corresponding electrical signal. The imaging system also includes a gantry configured to at least partially revolve the X-ray source and the X-ray detector about a primary rotational axis. The X-ray detector is coupled to the gantry so that a diagonal of the X-ray detector is oriented substantially perpendicular to the primary rotational axis.Type: ApplicationFiled: April 29, 2011Publication date: November 1, 2012Applicant: General Electric CompanyInventors: Joseph John Manak, Bernhard Erich Hermann Claus, Jens Rittscher, Hao Lai, Jeffrey Wayne Eberhard, Kedar Bhalchandra Khare, Cyril Riddell, Yves Lucien Trousset
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Patent number: 8189735Abstract: Systems and method for reconstruction of x-ray images are provided. One method includes acquiring a plurality of image views using an x-ray imaging system, the plurality of image views defining a limited tomographic dataset. The method also includes performing three-dimensional (3D) image reconstruction using the plurality of image views in an iterative reconstruction, wherein the iterative reconstruction includes forming a linear combination based on a plurality of previous iteration results. The method further includes displaying an image based on the image reconstruction, wherein the image includes clinically relevant high-frequency detail information.Type: GrantFiled: July 22, 2010Date of Patent: May 29, 2012Assignee: General Electric CompanyInventors: Kedar Bhalchandra Khare, Jeffrey Wayne Eberhard, Bernhard Erich Hermann Claus
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Patent number: 8184887Abstract: A tomographic imaging apparatus is provided for generating images. The tomographic apparatus includes a computer programmed to access a data sinogram representative of the image, reconstruct the image, divide the image into a plurality of sub-regions, define a region of interest including at least one sub-region, reprojecting a region of interest or a complement of the region of interest to generate a region of interest sinogram or a sinogram representative of the complement of the region of interest and reconstructing a resultant sinogram using iterative methods to generate an image.Type: GrantFiled: August 29, 2008Date of Patent: May 22, 2012Assignee: General Electric CompanyInventors: Kedar Bhalchandra Khare, Bruno Kristiaan Bernard De Man
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Publication number: 20120020448Abstract: Systems and method for reconstruction of x-ray images are provided. One method includes acquiring a plurality of image views using an x-ray imaging system, the plurality of image views defining a limited tomographic dataset. The method also includes performing three-dimensional (3D) image reconstruction using the plurality of image views in an iterative reconstruction, wherein the iterative reconstruction includes forming a linear combination based on a plurality of previous iteration results. The method further includes displaying an image based on the image reconstruction, wherein the image includes clinically relevant high-frequency detail information.Type: ApplicationFiled: July 22, 2010Publication date: January 26, 2012Inventors: Kedar Bhalchandra Khare, Jeffrey Wayne Eberhard, Bernhard Erich Hermann Claus
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Publication number: 20120002854Abstract: A signal processing method is presented. The method includes acquiring undersampled data corresponding to an object, initializing a first image solution and a second image solution, determining a linear combination solution based upon the first image solution and the second image solution, generating a plurality of selected coefficients by iteratively updating the first image solution, the second image solution and the linear combination solution and adaptively thresholding one or more transform coefficients utilizing the undersampled data, an updated first image solution, an updated second image solution and an updated linear combination solution, and reconstructing a data signal using the plurality of selected coefficients.Type: ApplicationFiled: June 30, 2010Publication date: January 5, 2012Applicant: GENERAL ELECTRIC COMPANYInventors: Kedar Bhalchandra Khare, Kevin Franklin King, Luca Marinelli, Christopher Judson Hardy
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Publication number: 20110142201Abstract: A multi-view imaging system and method is disclosed.Type: ApplicationFiled: December 15, 2009Publication date: June 16, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Jeffrey Wayne Eberhard, Bernhard Erich Hermann Claus, Colin Richard Wilson, Kedar Bhalchandra Khare
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Publication number: 20110038560Abstract: A signal processing method is provided. The signal processing method includes the steps of generating undersampled data corresponding to an object, determining a variable thresholding parameter based on a composition of the undersampled data, and iteratively determining thresholded coefficients to generate a plurality of coefficients by utilizing the undersampled data, a current solution and the variable thresholding parameter by updating the variable thresholding parameter and the current solution, and reconstructing a data signal using the plurality of coefficients.Type: ApplicationFiled: August 14, 2009Publication date: February 17, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Kedar Bhalchandra Khare, Christopher Judson Hardy, Kevin Franklin King, Luca Marinelli
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Publication number: 20100054561Abstract: A tomographic imaging apparatus is provided for generating images. The tomographic apparatus includes a computer programmed to access a data sinogram representative of the image, reconstruct the image, divide the image into a plurality of sub-regions, define a region of interest including at least one sub-region, reprojecting a region of interest or a complement of the region of interest to generate a region of interest sinogram or a sinogram representative of the complement of the region of interest and reconstructing a resultant sinogram using iterative methods to generate an image.Type: ApplicationFiled: August 29, 2008Publication date: March 4, 2010Applicant: GENERAL ELECTRIC COMPANYInventors: Kedar Bhalchandra Khare, Bruno Kristiaan Bernard De Man