Patents by Inventor Amar Dhanantwari
Amar Dhanantwari 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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Patent number: 11227414Abstract: A method includes processing projection data with a first reconstruction algorithm and reconstructing first reconstructed volumetric image data, wherein the first reconstructed volumetric image data has a first 3D noise function. The method further includes processing the same projection data with a second different reconstruction algorithm and reconstructing second reconstructed volumetric image data, wherein the second reconstructed volumetric image data has a second 3D noise function, which is different from the first 3D noise function. The method further includes visually presenting the first or the second reconstructed volumetric image data in a main viewport. The method further includes visually presenting a sub-portion the other of the first or the second reconstructed volumetric image data in a region of interest overlaid over a sub-portion of the main viewport.Type: GrantFiled: March 28, 2014Date of Patent: January 18, 2022Assignee: KONINKLIJKE PHILIPS N.V.Inventors: Amar Dhanantwari, Mukta Joshi, Yael Nae
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Patent number: 10706506Abstract: A method includes determining a low contrast detectability of a scan and generating an image quality index based on the determined low contrast detectability. Another method includes identifying an image quality index of interest, identifying an acquisition and/or reconstruction parameter based on the image quality index and a pre-determined mapping between image quality indexes and acquisition parameter and reconstruction parameters, and displaying the identified acquisition and/or the reconstruction parameter. A system (100) includes a metric determiner (122) that determines a first image quality index for a scan based on at least one of a low contrast detectability of the scan or a project domain noise of the scan, and/or a parameter recommender (126) that recommends at least one of an acquisition or a reconstruction parameter for a scan based on a second image quality index, and a display (114) that visually presents the first or second image quality index.Type: GrantFiled: April 3, 2014Date of Patent: July 7, 2020Assignee: KONINKLIJKE PHILIPS N.V.Inventors: Amar Dhanantwari, Dhruv Mehta, Yael Nae
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Publication number: 20160048982Abstract: A method includes processing projection data with a first reconstruction algorithm and reconstructing first reconstructed volumetric image data, wherein the first reconstructed volumetric image data has a first 3D noise function. The method further includes processing the same projection data with a second different reconstruction algorithm and reconstructing second reconstructed volumetric image data, wherein the second reconstructed volumetric image data has a second 3D noise function, which is different from the first3Dnoise function. The method further includes visually presenting the first or the second reconstructed volumetric image data in a main viewport. The method further includes visually presenting a sub-portion the other of the first or the second reconstructed volumetric image data in a region of interest overlaid over a sub-portion of the main viewport.Type: ApplicationFiled: March 28, 2014Publication date: February 18, 2016Inventors: Amar DHANANTWARI, Mukta JOSHI, Yael NAE
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Publication number: 20160042499Abstract: A method includes determining a low contrast detectability of a scan and generating an image quality index based on the determined low contrast detectability. Another method includes identifying an image quality index of interest, identifying an acquisition and/or reconstruction parameter based on the image quality index and a pre-determined mapping between image quality indexes and acquisition parameter and reconstruction parameters, and displaying the identified acquisition and/or the reconstruction parameter. A system (100) includes a metric determiner (122) that determines a first image quality index for a scan based on at least one of a low contrast detectability of the scan or a project domain noise of the scan, and/or a parameter recommender (126) that recommends at least one of an acquisition or a reconstruction parameter for a scan based on a second image quality index, and a display (114) that visually presents the first or second image quality index.Type: ApplicationFiled: April 3, 2014Publication date: February 11, 2016Applicant: KONINKLIJKE PHILIPS N.V.Inventors: Amar DHANANTWARI, Dhruv MEHTA, Yael NAE
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Patent number: 8180124Abstract: A method is disclosed for resolving misregistration errors resulting from dual energy double-shot projection radiographic image acquisition. The method involves an iterative multi-scale, multi-resolution registration process that corrects misregistration errors progressively at scales ranging from bulk anatomical drift down to smaller scale motion such as that of fine pulmonary vasculature. The method may be incorporated as part of a dual energy image processing chain to create dual energy images with improved image quality and diagnostic performance.Type: GrantFiled: March 20, 2008Date of Patent: May 15, 2012Inventors: Amar Dhanantwari, Jeffrey H. Siewerdsen, Richard L. VanMetter
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Publication number: 20080247626Abstract: A method is disclosed for resolving misregistration errors resulting from dual energy double-shot projection radiographic image acquisition. The method involves an iterative multi-scale, multi-resolution registration process that corrects misregistration errors progressively at scales ranging from bulk anatomical drift down to smaller scale motion such as that of fine pulmonary vasculature. The method may be incorporated as part of a dual energy image processing chain to create dual energy images with improved image quality and diagnostic performance.Type: ApplicationFiled: March 20, 2008Publication date: October 9, 2008Inventors: Amar Dhanantwari, Jeffrey H. Siewerdsen, Richard L. VanMetter
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Patent number: 6894494Abstract: The present invention relates to a signal processing method and system for correcting organ motion artifacts for cardiac and brain imaging. A plurality of sets of MRI measurement data indicative of at least an image of an object is received. Each set corresponds to one row kx of a k-space matrix of at least a k-space matrix. For each set a k-space matrix of the at least a k-space matrix is determined for allocation thereto based on motion information of the object occurring during acquisition of the plurality of sets of the MRI measurement data. In a following step a location within the allocated k-space matrix corresponding to a row of the k-space matrix allocated thereto is determined for each set. At least a k-space matrix is then generated by re-arranging the plurality of sets. Each of the at least a k-space matrix comprises the sets of the plurality of sets of the MRI measurement data allocated thereto.Type: GrantFiled: June 30, 2003Date of Patent: May 17, 2005Assignee: Her Majesty the Queen in right of Canada, as represented by the Minister of National Defence of Her Majesty's Canadian GovernmentInventors: Stergios Stergiopoulos, Miroslaw Wrobel, Andreas Freibert, Waheed Younis, Amar Dhanantwari
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Patent number: 6805671Abstract: A method and a device for measuring blood pressure and heart rate in an environment comprising extreme levels of noise and vibrations is disclosed. Blood pressure signals corresponding to the Korotkoff sounds are detected using an array of primary acoustic sensors, placed on the patient's skin over the brachial artery. A secondary acoustic transducer is placed on the outside of a pressure cuff the patient away for detecting noise and vibrations. Pressure is applied to the artery using the pressure cuff forcing the artery to close. The pressure is then reduced and while reducing the pressure the acoustic signals detected by the first and second acoustic sensor as well as a signal indicative of the pressure applied to the artery are provided to a processor. The signals provided by the primary acoustic sensors are then processed using a combination of focused beamforming and planar wave beamforming.Type: GrantFiled: January 15, 2003Date of Patent: October 19, 2004Assignee: Her Majesty the Queen in right of Canada, as represented by the Minister of National DefenceInventors: Stergios Stergiopoulos, Amar Dhanantwari, Lisa Pinto, Ronald Zachariah, Man Yee Winnie Wong
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Publication number: 20040102695Abstract: The present invention relates to a signal processing method and system for correcting organ motion artifacts for cardiac and brain imaging. A plurality of sets of MRI measurement data indicative of at least an image of an object is received. Each set corresponds to one row kx of a k-space matrix of at least a k-space matrix. For each set a k-space matrix of the at least a k-space matrix is determined for allocation thereto based on motion information of the object occurring during acquisition of the plurality of sets of the MRI measurement data. In a following step a location within the allocated k-space matrix corresponding to a row of the k-space matrix allocated thereto is determined for each set. At least a k-space matrix is then generated by re-arranging the plurality of sets. Each of the at least a k-space matrix comprises the sets of the plurality of sets of the MRI measurement data allocated thereto.Type: ApplicationFiled: June 30, 2003Publication date: May 27, 2004Inventors: Stergios Stergiopoulos, Miroslaw Wrobel, Andreas Freibert, Waheed Younis, Amar Dhanantwari
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Patent number: 6705998Abstract: A method and a device for measuring systolic and diastolic blood pressure and heart rate in an environment comprising extreme levels of noise and vibrations is disclosed. Blood pressure signals corresponding to the Korotkoff sounds are detected using a first acoustic sensor, or array of sensors, placed on the patient's skin over the brachial artery. A second acoustic transducer is placed on the outside of a pressure cuff the patient away for detecting noise and vibrations. Pressure is applied to the artery using the pressure cuff forcing the artery to close. The pressure is then reduced and while reducing the pressure the acoustic signals detected by the first and second acoustic sensor as well as a signal indicative of the pressure applied to the artery are provided to a processor. The signal of the first acoustic sensor is then processed using an adaptive interferer canceller algorithm with the signal of the second acoustic sensor as interferer.Type: GrantFiled: April 29, 2002Date of Patent: March 16, 2004Assignee: Her Majesty the Queen in right of Canada, as represented by the Minister of National DefenceInventors: Stergios Stergiopoulos, Amar Dhanantwari, Lisa Pinto, Ronald Zachariah
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Publication number: 20030139674Abstract: A method and a device for measuring blood pressure and heart rate in an environment comprising extreme levels of noise and vibrations is disclosed. Blood pressure signals corresponding to the Korotkoff sounds are detected using an array of primary acoustic sensors, placed on the patient's skin over the brachial artery. A secondary acoustic transducer is placed on the outside of a pressure cuff the patient away for detecting noise and vibrations. Pressure is applied to the artery using the pressure cuff forcing the artery to close. The pressure is then reduced and while reducing the pressure the acoustic signals detected by the first and second acoustic sensor as well as a signal indicative of the pressure applied to the artery are provided to a processor. The signals provided by the primary acoustic sensors are then processed using a combination of focused beamforming and planar wave beamforming.Type: ApplicationFiled: January 15, 2003Publication date: July 24, 2003Inventors: Stergios Stergiopoulos, Amar Dhanantwari, Lisa Pinto, Ronald Zachariah, Man Yee Winnie Wong
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Publication number: 20020143259Abstract: A method and a device for measuring systolic and diastolic blood pressure and heart rate in an environment comprising extreme levels of noise and vibrations is disclosed. Blood pressure signals corresponding to the Korotkoff sounds are detected using a first acoustic sensor, or array of sensors, placed on the patient's skin over the brachial artery. A second acoustic transducer is placed on the outside of a pressure cuff the patient away for detecting noise and vibrations. Pressure is applied to the artery using the pressure cuff forcing the artery to close. The pressure is then reduced and while reducing the pressure the acoustic signals detected by the first and second acoustic sensor as well as a signal indicative of the pressure applied to the artery are provided to a processor. The signal of the first acoustic sensor is then processed using an adaptive interferer canceller algorithm with the signal of the second acoustic sensor as interferer.Type: ApplicationFiled: April 29, 2002Publication date: October 3, 2002Inventors: Stergios Stergiopoulos, Amar Dhanantwari, Lisa Pinto, Ronald Zachariah