Patents by Inventor Thomas Leroy Laurence
Thomas Leroy Laurence 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: 20220395707Abstract: Disclosed herein are systems and methods for real-time monitoring of patient position and/or location during a radiation treatment session. Images acquired of a patient during a treatment session can be used to calculate the patient's position and/or location with respect to the components of the radiation therapy system. One variation of a radiation therapy system includes a circular gantry with a rotatable ring coupled to a stationary frame, a therapeutic radiation source mounted on the rotatable ring, and a patient-monitoring imaging system mounted on the rotatable ring. The patient-monitoring system may have one or more image sensors or cameras disposed on the rotatable ring within a bore region of the radiation therapy system, and may be configured to acquire image data as the ring rotates.Type: ApplicationFiled: June 28, 2022Publication date: December 15, 2022Inventors: Thomas Leroy LAURENCE, JR., Jayakrishnan JANARDHANAN
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Publication number: 20220296929Abstract: Disclosed herein are systems and methods for real-time monitoring of patient position and/or location during a radiation treatment session. Images acquired of a patient during a treatment session can be used to calculate the patient's position and/or location with respect to the components of the radiation therapy system. One variation of a radiation therapy system includes a circular gantry with a rotatable ring coupled to a stationary frame, a therapeutic radiation source mounted on the rotatable ring, and a patient-monitoring imaging system mounted on the rotatable ring. The patient-monitoring system may have one or more image sensors or cameras disposed on the rotatable ring within a bore region of the radiation therapy system, and may be configured to acquire image data as the ring rotates.Type: ApplicationFiled: June 10, 2022Publication date: September 22, 2022Inventors: Thomas Leroy LAURENCE, JR., Jayakrishnan JANARDHANAN
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Patent number: 11369806Abstract: Disclosed herein are systems and methods for real-time monitoring of patient position and/or location during a radiation treatment session. Images acquired of a patient during a treatment session can be used to calculate the patient's position and/or location with respect to the components of the radiation therapy system. One variation of a radiation therapy system includes a circular gantry with a rotatable ring coupled to a stationary frame, a therapeutic radiation source mounted on the rotatable ring, and a patient-monitoring imaging system mounted on the rotatable ring. The patient-monitoring system may have one or more image sensors or cameras disposed on the rotatable ring within a bore region of the radiation therapy system, and may be configured to acquire image data as the ring rotates.Type: GrantFiled: November 14, 2018Date of Patent: June 28, 2022Assignee: RefleXion Medical, Inc.Inventors: Thomas Leroy Laurence, Jr., Jayakrishnan Janardhanan
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Patent number: 10914851Abstract: Time of flight (TOF) corrections for radiation detector elements of a TOF positron emission tomography (TOF PET) scanner are generated by solving an over-determined set of equations defined by calibration data acquired by the TOF PET scanner from a point source located at an isocenter of the TOF PET scanner, suitably represented as matrix equation at ?t=CS where ?t represents TOF time differences, C is a relational matrix encoding the radiation detector elements, and S represents the TOF corrections. A pseudo-inverse C?1 of relational matrix C may be computed to solve S=C?1 ?t. TOF corrections can be generated for a particular type of detector unit by identifying the radiation detector elements in C by detector unit. Further, multi-photon triggering time stamps can be adjusted to first-photon triggering based on ?{square root over (P1/Pm)} where P1 is average photon count using first-photon triggering and Pm is a photon count using multi-photon triggering.Type: GrantFiled: June 25, 2020Date of Patent: February 9, 2021Assignee: KONINKLIJKE PHILIPS N.V.Inventors: Sharon Xiaorong Wang, Thomas Leroy Laurence
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Publication number: 20200363543Abstract: Time of flight (TOF) corrections for radiation detector elements of a TOF positron emission tomography (TOF PET) scanner are generated by solving an over-determined set of equations defined by calibration data acquired by the TOF PET scanner from a point source located at an isocenter of the TOF PET scanner, suitably represented as matrix equation ?t=CS where ?t represents TOF time differences, C is a relational matrix encoding the radiation detector elements, and S represents the TOF corrections. A pseudo-inverse C?1 of relational matrix C may be computed to solve S=C?1?t. TOF corrections can be generated for a particular type of detector unit by identifying the radiation detector elements in C by detector unit. Further, multi-photon triggering time stamps can be adjusted to first-photon triggering based on ?{square root over (P1/Pm)} where P1 is average photon count using first-photon triggering and Pm is a photon count using multi-photon triggering.Type: ApplicationFiled: June 25, 2020Publication date: November 19, 2020Inventors: Sharon Xiaorong WANG, Thomas Leroy LAURENCE
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Patent number: 10732300Abstract: The present application relates generally to positron emission tomography (PET). It finds particular application in conjunction with energy calibration of a digital PET (DPET) detector and will be described with particular reference thereto. In one aspect, a difference spectrum is produced by finding a difference between a background radiation spectrum with no radioactive source loaded and a calibration source radiation spectrum with a radioactive source loaded. The difference spectrum may then be used to identify an energy peak.Type: GrantFiled: October 12, 2016Date of Patent: August 4, 2020Assignee: KONINKLIJKE PHILIPS N.V.Inventors: Thomas Leroy Laurence, Sharon Xiaorong Wang
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Patent number: 10698125Abstract: Time of flight (TOF) corrections for radiation detector elements of a TOF positron emission tomography (TOF PET) scanner are generated by solving an over-determined set of equations defined by calibration data acquired by the TOF PET scanner from a point source located at an isocenter of the TOF PET scanner, suitably represented as matrix equation Formula I=CS where Formula I represents TOF time differences, C is a relational matrix encoding the radiation detector elements, and S represents the TOF corrections. A pseudo-inverse C?1 of relational matrix C may be computed to solve S=C?1 Formula I. TOF corrections can be generated for a particular type of detector unit by identifying the radiation detector elements in C by detector unit. Further, multi-photon triggering time stamps can be adjusted to first-photon triggering based on Formula II where P1 is average photon count using first-photon triggering and Pm is a photon count using multi-photon triggering.Type: GrantFiled: September 17, 2015Date of Patent: June 30, 2020Assignee: KONINKLIJKE PHILIPS N.V.Inventors: Sharon Xiaorong Wang, Thomas Leroy Laurence
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Patent number: 10520613Abstract: A medical nuclear imaging system (10) and method (100) generate smooth energy histograms. Radiation events are detected by a plurality of detectors (14), the radiation events localized to a plurality of pixels of the detectors (14). The energy levels of the detected radiation events are estimated and the estimated energy levels are scaled with scaling parameters that scale the energy centroids of the plurality of pixels to target values differing by offsets around a common target value, the target values differing with spatial location of the plurality of pixels. Target value offsets are removed from the scaled energy levels and the detected radiation events are combined into an energy histogram using the energy levels with the target value offsets removed.Type: GrantFiled: October 14, 2014Date of Patent: December 31, 2019Assignee: KONINKLUKE PHILIPS N.V.Inventors: Jerome John Griesmer, Thomas Leroy Laurence
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Patent number: 10379228Abstract: A photon detector includes a sensor array of optical sensors disposed in a plane and four substantially identical scintillation crystal bars. Each optical sensor is configured to sense luminescence. Each of the four scintillator crystal bars being a rectangular prism with four side surfaces and first and second end surfaces, each scintillation bar has two side surfaces which each face a side surface of another scintillation bar, and each scintillation crystal bar generating a light scintillation in response to interacting with a received gamma photon. A first layer (80) is disposed in a first plane disposed between and adjacent facing side surfaces of the four substantially identical scintillation crystal bars with a light sharing portion (82) adjacent the first end surface and a reflective portion (84) adjacent the second end surface.Type: GrantFiled: October 14, 2015Date of Patent: August 13, 2019Assignees: KONINKLIJKE PHILIPS N.V., UNIVERSITY OF WASHINGTONInventors: David Sowards-Emmerd, Adrienne Lehnert, William Hunter, Robert Miyaoka, Lingxiong Shao, Thomas Leroy Laurence
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Patent number: 10371836Abstract: A system (10) and method for energy correction of positron emission tomography (PET) event data by at least one processor. Event data for a plurality of strike events corresponding to gamma events is received. Each strike event is detected by a pixel of a detector module (50) and includes an energy and a time. The energy of the strike events is linearized using an energy linearity correction model including one or more parameters. Clusters of the strike events are identified based on the times of the strike events, and sub-clusters of the clusters are identified based on the pixels corresponding to the strike events of the clusters. Energies of the sub-clusters are corrected using a first set of correction factors, and energies of clusters including a plurality of sub-clusters are corrected using a second set of correction factors.Type: GrantFiled: May 30, 2013Date of Patent: August 6, 2019Assignee: KONINKLIJKE PHILIPS N.V.Inventors: Sharon Xiaorong Wang, Thomas Leroy Laurence
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Publication number: 20190143145Abstract: Disclosed herein are systems and methods for real-time monitoring of patient position and/or location during a radiation treatment session. Images acquired of a patient during a treatment session can be used to calculate the patient's position and/or location with respect to the components of the radiation therapy system. One variation of a radiation therapy system includes a circular gantry with a rotatable ring coupled to a stationary frame, a therapeutic radiation source mounted on the rotatable ring, and a patient-monitoring imaging system mounted on the rotatable ring. The patient-monitoring system may have one or more image sensors or cameras disposed on the rotatable ring within a bore region of the radiation therapy system, and may be configured to acquire image data as the ring rotates.Type: ApplicationFiled: November 14, 2018Publication date: May 16, 2019Inventors: Thomas Leroy LAURENCE, JR., Jayakrishnan JANARDHANAN
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Publication number: 20180341027Abstract: The present application relates generally to positron emission tomography (PET). It finds particular application in conjunction with energy calibration of a digital PET (DPET) detector and will be described with particular reference thereto. In one aspect, a difference spectrum is produced by finding a difference between a background radiation spectrum with no radioactive source loaded and a calibration source radiation spectrum with a radioactive source loaded. The difference spectrum may then be used to identify an energy peak.Type: ApplicationFiled: October 12, 2016Publication date: November 29, 2018Inventors: Thomas Leroy LAURENCE, Sharon Xiaorong WANG
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Patent number: 10101474Abstract: A positron emission tomography (PET) apparatus and method employs a plurality of radiation detectors (20) disposed around an imaging region (16) and configured to detect 511 keV radiation events emanating from the imaging region. A calibration phantom is disposed in the imaging region. One or more processors are configured to: acquire and store listmode data of the phantom; measure a random rate for each line of response (LOR) from the listmode data using a coincident 511 keV events detector (34) with a time offset (54); determine a singles rate for each detector pixel from the random event rate, for example via a histogram plotting singles rate for each detector pixel; compute a live time factor of each LOR; compute a dead time correction factor as the reciprocal of the live time factor; and correct images according to the dead time correction factor.Type: GrantFiled: December 14, 2015Date of Patent: October 16, 2018Assignee: KONINKLIJKE PHILIPS N.V.Inventors: Thomas Leroy Laurence, Sharon Xiarong Wang
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Patent number: 10101475Abstract: A system (10) and a method (100) compensate for one or more dead pixels in positron emission tomography (PET) imaging. A pixel compensation processor receives PET data describing a target volume of a subject. The PET data is missing data for one or more dead pixels. The pixel compensation estimates PET data for the dead pixels from the received PET data.Type: GrantFiled: March 17, 2015Date of Patent: October 16, 2018Assignee: KONINKLIJKE PHILIPS N.V.Inventors: Thomas Leroy Laurence, Sharon Xiaorong Wang
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Patent number: 10004472Abstract: A diagnostic imaging system includes a plurality of radiation detectors (20) configured to detect radiation events emanating from an imaging region. The system includes a calibration phantom (14) configured to be disposed in the imaging region spanning substantially an entire field of view and to generate radiation event pairs that define lines-of-response, wherein the calibration phantom is thin such that each LOR intersects the calibration phantom along its length, the thickness of the phantom being smaller than the length of the LORs. A calibration processor (24) receives input of the radiation detectors and calculates an incidence angle independent crystal delay Ti for each detector. The calibration processor (24) constructs a first look-up table for the timing correction of each LOR and a second look-up table for the angle depth of interaction correction for each crystal by combining Ti and ?i.Type: GrantFiled: October 15, 2015Date of Patent: June 26, 2018Assignee: KONINKLIJKE PHILIPS N.V.Inventors: Jinghan Ye, Xiyun Song, Thomas Leroy Laurence, Sharon Xiaorong Wang
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Publication number: 20180133508Abstract: Described here are systems, devices, and methods for imaging and radiotherapy procedures. Generally, a radiotherapy system may include a radiotransparent patient platform, a radiation source coupled to a multi-leaf collimator, and a detector facing the collimator. The radiation source may be configured to emit a first beam through the collimator to provide treatment to a patient on the patient platform. A controller may be configured to control the radiotherapy system.Type: ApplicationFiled: November 15, 2017Publication date: May 17, 2018Inventors: William PEARCE, Brent HARPER, Peter OLCOTT, Manat MAOLINBAY, Rostem BASSALOW, George ZDASIUK, Thomas Leroy LAURENCE, JR.
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Publication number: 20180021009Abstract: A diagnostic imaging system comprises a plurality of radiation detectors (20) configured to detect radiation events emanating from an imaging region. The system comprises a calibration phantom (14) configured to be disposed in the imaging region spanning substantially an entire field of view and to generate radiation event pairs that define lines-of-response, wherein the calibration phantom is thin such that each LOR intersects the calibration phantom along its length, the thickness of the phantom being smaller than the length of the LORs. A calibration processor (24) receives input of the radiation detectors and calculates an incidence angle independent crystal delay ?i for each detector.Type: ApplicationFiled: October 15, 2015Publication date: January 25, 2018Inventors: Jinghan YE, Xiyun SONG, Thomas Leroy LAURENCE, Sharon Xiaorong WANG
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Publication number: 20170371046Abstract: A positron emission tomography (PET) apparatus and method employs a plurality of radiation detectors (20) disposed around an imaging region (16) and configured to detect 511 keV radiation events emanating from the imaging region. A calibration phantom is disposed in the imaging region. One or more processors are configured to: acquire and store listmode data of the phantom; measure a random rate for each line of response (LOR) from the listmode data using a coincident 511 keV events detector (34) with a time offset (54); determine a singles rate for each detector pixel from the random event rate, for example via a histogram plotting singles rate for each detector pixel; compute a live time factor of each LOR; compute a dead time correction factor as the reciprocal of the live time factor; and correct images according to the dead time correction factor.Type: ApplicationFiled: December 14, 2015Publication date: December 28, 2017Inventors: Thomas Leroy LAURENCE, Sharon Xiarong WANG
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Patent number: 9841515Abstract: A system (10) and a method (150) identify non-functioning pixels in positron emission tomography (PET) imaging. Data describing scintillation events localized to a plurality of pixels (22, 32) of a PET scanner (12) is received. A count map histogram is generated from the received data. The count map histogram maps each of the pixels (22, 32) to a count of scintillation events localized to the pixel (22, 32). One or more non-functioning pixels are identified from the count map histogram.Type: GrantFiled: March 19, 2015Date of Patent: December 12, 2017Assignee: KONINKLIJKE PHILIPS N.V.Inventors: Thomas Leroy Laurence, Sharon Xiaorong Wong
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Publication number: 20170276811Abstract: Time of flight (TOF) corrections for radiation detector elements of a TOF positron emission tomography (TOF PET) scanner are generated by solving an over-determined set of equations defined by calibration data acquired by the TOF PET scanner from a point source located at an isocenter of the TOF PET scanner, suitably represented as matrix equation Formula I=CS where Formula I represents TOF time differences, C is a relational matrix encoding the radiation detector elements, and S represents the TOF corrections. A pseudo-inverse C?1 of relational matrix C may be computed to solve S=C?1 Formula I. TOF corrections can be generated for a particular type of detector unit by identifying the radiation detector elements in C by detector unit. Further, multi-photon triggering time stamps can be adjusted to first-photon triggering based on Formula II where P1 is average photon count using first-photon triggering and Pm is a photon count using multi-photon triggering.Type: ApplicationFiled: September 17, 2015Publication date: September 28, 2017Inventors: Sharon Xiaorong WANG, Thomas Leroy LAURENCE