Patents by Inventor Wai-Hoi Wong
Wai-Hoi Wong 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: 10497741Abstract: Apparatus and methods for optical emission detection comprising scintillating proximal sensors.Type: GrantFiled: January 4, 2017Date of Patent: December 3, 2019Assignee: Board of Regents, The University of Texas SystemInventors: Wai-hoi Wong, Hongdi Li, Rocio Alicia Ramirez-Jaramillo, Yuxuan Zhang, Hossain Baghaei
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Patent number: 10466371Abstract: Apparatus and methods for depth-of-interaction (DOI) positron tomography detection are disclosed herein. Certain embodiments utilize dichotomous sensing to obtain DOI information.Type: GrantFiled: April 29, 2016Date of Patent: November 5, 2019Assignee: Board of Regents, The University of Texas SystemInventors: Yuxuan Zhang, Wai-hoi Wong
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Publication number: 20190019837Abstract: Apparatus and methods for optical emission detection comprising scintillating proximal sensors.Type: ApplicationFiled: January 4, 2017Publication date: January 17, 2019Applicant: Board of Regents, The University of Texas SystemInventors: Wai-hoi WONG, Hongdi LI, Rocio Alicia RAMIREZ-JARAMILLO, Yuxuan ZHANG, Hossain BAGHAEI
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Publication number: 20180292548Abstract: Apparatus and methods for depth-of-interaction (DOI) positron tomography detection are disclosed herein. Certain embodiments utilize dichotomous sensing to obtain DOI information.Type: ApplicationFiled: April 29, 2016Publication date: October 11, 2018Inventors: Yuxuan ZHANG, Wai-hoi WONG
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Patent number: 9372267Abstract: Apparatus and methods comprising a positron emission tomography detector having a first rectangular cross-section crystal block positioned between a first pentagonal cross-section crystal block and a second pentagonal cross-section crystal block.Type: GrantFiled: November 20, 2013Date of Patent: June 21, 2016Assignee: Board of Regents, The University of Texas SystemInventors: Hongdi Li, Wai-Hoi Wong, Yuxuan Zhang
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Publication number: 20140138548Abstract: Apparatus and methods comprising a positron emission tomography detector having a first rectangular cross-section crystal block positioned between a first pentagonal cross-section crystal block and a second pentagonal cross-section crystal block.Type: ApplicationFiled: November 20, 2013Publication date: May 22, 2014Applicant: Board of Regents, The University of Texas SystemInventors: Hongdi LI, Wai-Hoi WONG, Yuxuan ZHANG
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Patent number: 7238943Abstract: Systems and methods are described for asymmetrically placed cross-coupled scintillation crystals. A method includes coupling a plurality of photomultiplier tubes to a scintillation crystal array, the scintillation crystal array defining a plurality of corner edges, wherein a first corner edge of the plurality of corner edges is aligned with a first center of a first photomultiplier tube of the plurality of photomultiplier tubes and a second corner edge of the plurality of corner edges is not aligned with a second center of a second photomultiplier tube of the plurality of photomultiplier tubes.Type: GrantFiled: January 31, 2003Date of Patent: July 3, 2007Assignee: Board of Regents, The University of Texas SystemInventors: Wai-Hoi Wong, Jorge Uribe, Hossain Baghaei, Hongdi Li
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Patent number: 7071474Abstract: Methods and apparatus for tuning scintillation detectors. An output of a first light is equalized with an output of a neighboring, second light. The outputs are measured by one or more light detectors shared by the first and second lights. Outputs of a plurality of light detectors are equalized using the equalized output of the first light.Type: GrantFiled: December 22, 2003Date of Patent: July 4, 2006Assignee: Board of Regents, The University of Texas SystemInventors: Wai-Hoi Wong, Hongdi Li, Jorge Uribe, Yaqiang Liu, Hossain Baghaei
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Patent number: 6956214Abstract: Systems and methods are described for a production method for making position-sensitive radiation detector arrays. A method includes applying a plurality of masks to a plurality of scintillation crystal slabs; coupling the plurality of scintillation crystal slabs to form a sandwich structure; cutting a plurality of slices from the sandwich structure; and coupling at least two of the plurality of slices to form a detector array.Type: GrantFiled: January 31, 2003Date of Patent: October 18, 2005Assignee: Board of Regnets, The University of Texas SystemInventors: Wai-Hoi Wong, Jorge Uribe, Hossain Baghaei, Hongdi Li
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Patent number: 6936822Abstract: Methods and apparatuses for obtaining position and energy information without pileup. Signal integration, which is triggered by a present event, stops when a subsequent event is detected. A weighted value for estimating the total energy in a scintillation is calculated, which includes the energy of the current event and a residual energy from previous events. Remnant correction is used to calculate a pile-up free energy from two consecutive weighted values. An analog filter may be applied to reduce noise. Dynamic digital weighting of integrated values, and/or digital integration may be used during data processing. Pileup can be avoided in conjunction with several types of applications, including multi-zone detector applications and coincidence detection applications. High-resolution timing techniques are also disclosed that facilitate one's ability to avoid pileup.Type: GrantFiled: October 16, 2001Date of Patent: August 30, 2005Assignee: Board of Regents, The University of Texas SystemInventors: Wai-Hoi Wong, Hongdi Li, Jorge Uribe, Hossain Baghaei
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Publication number: 20040188624Abstract: Methods and apparatus for tuning scintillation detectors. An output of a first light is equalized with an output of a neighboring, second light. The outputs are measured by one or more light detectors shared by the first and second lights. Outputs of a plurality of light detectors are equalized using the equalized output of the first light.Type: ApplicationFiled: December 22, 2003Publication date: September 30, 2004Inventors: Wai-Hoi Wong, Hongdi Li, Jorge Uribe, Yaqiang Liu, Hossain Baghaei
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Patent number: 6744053Abstract: Systems and methods are described for a positron emission tomography camera with individually rotatable detector modules and/or individually movable shielding sections. An apparatus, includes a detector ring including a plurality of individually movable detector modules. Another apparatus, includes a radiation shield including a plurality of individually moveable shield sections. A method, includes generating an emission image of a sample; generating a transmission image of said sample while generating said emission image of said sample; and then correcting said emission image with said transmission image.Type: GrantFiled: January 7, 2002Date of Patent: June 1, 2004Assignee: Board of Regents, The University of Texas SystemInventors: Wai-Hoi Wong, Jorge Uribe, Hossain Baghaei, Hongdi Li
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Publication number: 20040036025Abstract: Methods and apparatuses for obtaining position and energy information without pileup. Signal integration, which is triggered by a present event, stops when a subsequent event is detected. A weighted value for estimating the total energy in a scintillation is calculated, which includes the energy of the current event and a residual energy from previous events. Remnant correction is used to calculate a pile-up free energy from two consecutive weighted values. An analog filter may be applied to reduce noise. Dynamic digital weighting of integrated values, and/or digital integration may be used during data processing. Pileup can be avoided in conjunction with several types of applications, including multi-zone detector applications and coincidence detection applications. High-resolution timing techniques are also disclosed that facilitate one's ability to avoid pileup.Type: ApplicationFiled: October 16, 2001Publication date: February 26, 2004Applicant: Board of Regents, The University of Texas SystemInventors: Wai-Hoi Wong, Hongdi Li, Jorge Uribe, Hossain Baghaei
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Publication number: 20040021082Abstract: Systems and methods are described for asymmetrically placed cross-coupled scintillation crystals. A method includes coupling a plurality of photomultiplier tubes to a scintillation crystal array, the scintillation crystal array defining a plurality of corner edges, wherein a first corner edge of the plurality of corner edges is aligned with a first center of a first photomultiplier tube of the plurality of photomultiplier tubes and a second corner edge of the plurality of corner edges is not aligned with a second center of a second photomultiplier tube of the plurality of photomultiplier tubes.Type: ApplicationFiled: January 31, 2003Publication date: February 5, 2004Applicant: Board of Regents, The University of Texas SystemInventors: Wai-Hoi Wong, Jorge Uribe, Hossain Baghaei, Hongdi Li
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Publication number: 20030226972Abstract: Systems and methods are described for a production method for making position-sensitive radiation detector arrays. A method includes applying a plurality of masks to a plurality of scintillation crystal slabs; coupling the plurality of scintillation crystal slabs to form a sandwich structure; cutting a plurality of slices from the sandwich structure; and coupling at least two of the plurality of slices to form a detector array.Type: ApplicationFiled: January 31, 2003Publication date: December 11, 2003Applicant: Board of Regents, The University of Texas SystemInventors: Wai-Hoi Wong, Jorge Uribe, Hossain Baghaei, Hongdi Li
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Patent number: 6525322Abstract: Gamma cameras and positron (PET) cameras use scintillation detectors to detect radiation from the body. However, when the number of radiation particles that strike the detector is very high, the chance that signals from two or more individual particles will pile up in the detector (to produce one erroneous, larger signal) is high. This problem is common to all applications using scintillation detectors. The present invention discloses methods and apparatus to prevent and correct for this problem. Results from a circuit according to the present invention show at least a 10 fold improvement in the maximum detection-rate limit over the conventional method.Type: GrantFiled: September 20, 2001Date of Patent: February 25, 2003Assignee: Board of Regents, The University of Texas SystemInventors: Wai-Hoi Wong, Hongdi Li
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Publication number: 20020148970Abstract: Systems and methods are described for a positron emission tomography camera with individually rotatable detector modules and/or individually movable shielding sections. An apparatus, includes a detector ring including a plurality of individually movable detector modules. Another apparatus, includes a radiation shield including a plurality of individually moveable shield sections. A method, includes generating an emission image of a sample; generating a transmission image of said sample while generating said emission image of said sample; and then correcting said emission image with said transmission image.Type: ApplicationFiled: January 7, 2002Publication date: October 17, 2002Applicant: Board of Regents, The University of Texas SystemInventors: Wai-Hoi Wong, Jorge Uribe, Hossain Baghaei, Hongdi Li
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Publication number: 20020121603Abstract: Gamma cameras and positron (PET) cameras use scintillation detectors to detect radiation from the body. However, when the number of radiation particles that strike the detector is very high, the chance that signals from two or more individual particles will pile up in the detector (to produce one erroneous, larger signal) is high. This problem is common to all applications using scintillation detectors. The present invention discloses methods and apparatus to prevent and correct for this problem. Results from a circuit according to the present invention show at least a 10 fold improvement in the maximum detection-rate limit over the conventional method.Type: ApplicationFiled: September 20, 2001Publication date: September 5, 2002Applicant: Board of Regents, The University of Texas SystemInventors: Wai-Hoi Wong, Hongdi Li
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Patent number: 6310349Abstract: Gamma cameras and positron (PET) cameras use scintillation detectors to detect radiation from the body. However, when the number of radiation particles that strike the detector is very high, the chance that signals from two or more individual particles will pile up in the detector (to produce one erroneous, larger signal) is high. This problem is common to all applications using scintillation detectors. The present invention discloses methods and apparatus to prevent and correct for this problem. Results from a circuit according to the present invention show at least a 10 fold improvement in the maximum detection-rate limit over the conventional method.Type: GrantFiled: May 7, 1998Date of Patent: October 30, 2001Assignee: Board of Regents, The University of Texas SystemInventors: Wai-Hoi Wong, Hongdi Li
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Patent number: 5825031Abstract: A PET camera is disclosed with radially translating detector segments coupled with a rotational motion to tailor the camera detector ring to the size of the subject for optimal detection efficiency. In particular methods of using the present invention, the detector segments may be radially translated to describe a small diameter in imaging a small object, such as a breast. Alternately, the detectors may comprise a large diameter to image a large object, such as body. The detector segments may be diametrically opposed for optimal positron detection. The present invention may be coupled with a quadrant-sharing-photomultiplier-detector design.Type: GrantFiled: October 11, 1996Date of Patent: October 20, 1998Assignee: Board of Regents The University of Texas SystemInventors: Wai-Hoi Wong, Jorge Uribe