Patents by Inventor Brian E. Harwood
Brian E. Harwood 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: 9121950Abstract: An imaging detector (214) includes a scintillator array (216) including a scintillator element (228) and a material (230) and a photosensor array (218) including a detector element (222) having a light sensitive region (224) and a non-sensitive region (226). The light sensitive region is separated from the scintillator element by a gap, the light sensitive region is in one-to-one mechanical alignment with the scintillator element, and the non-sensitive region is in mechanical alignment with the material. The detector further includes structure (234) that includes one or more material free channels. The structure is located between the non-sensitive region and the material and not between the light sensitive region and the scintillator element. An optical adhesive (232) is located in the gap, filling the entire gap, and mechanically and optically coupling the light sensitive region and the scintillator element.Type: GrantFiled: April 5, 2012Date of Patent: September 1, 2015Assignee: Koninklijke Philips N.V.Inventors: Randall Peter Luhta, Marc Anthony Chappo, Brian E. Harwood, Rodney Arnold Mattson
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Patent number: 8710448Abstract: A radiation detector module (22) particularly well suited for use in computed tomography (CT) applications includes a scintillator (200), a photodetector array (202), and signal processing electronics (205). The photodetector array (202) includes a semiconductor substrate (208) having a plurality of photodetectors and metalization (210) fabricated on non-illuminated side of the substrate (208). The metalization routes electrical signals between the photodetectors and the signal processing electronics (205) and between the signal processing electronics (205) and an electrical connector (209).Type: GrantFiled: March 8, 2007Date of Patent: April 29, 2014Assignee: Koninklijke Philips N.V.Inventors: Randall P. Luhta, Marc A. Chappo, Brian E. Harwood, Rodney A. Mattson, Chris J. Vrettos
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Publication number: 20140029724Abstract: An imaging detector (214) includes a scintillator array (216) including a scintillator element (228) and a material (230) and a photosensor array (218) including a detector element (222) having a light sensitive region (224) and a non-sensitive region (226). The light sensitive region is separated from the scintillator element by a gap, the light sensitive region is in one-to-one mechanical alignment with the scintillator element, and the non-sensitive region is in mechanical alignment with the material. The detector further includes structure (234) that includes one or more material free channels. The structure is located between the non-sensitive region and the material and not between the light sensitive region and the scintillator element. An optical adhesive (232) is located in the gap, filling the entire gap, and mechanically and optically coupling the light sensitive region and the scintillator element.Type: ApplicationFiled: April 5, 2012Publication date: January 30, 2014Applicant: KONINKLIJKE PHILIPS N.V.Inventors: Randall Peter Luhta, Marc Anthony Chappo, Brian E. Harwood, Rodney Arnold Mattson
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Publication number: 20130292575Abstract: An imaging detector includes processing electronics with a thermal coefficient about equal to a negative of a summation of thermal coefficients of a photosensor array and a scintillator array of the detector. In another instance, the imaging detector includes an A/D converter that alternately converts first charge corresponding to impinging radiation into a first signal and second charge corresponding to decaying charge into a second signal and a logic unit that corrects the first signal based on the second signal. In another instance, the imaging detector includes an A/D converter, an integrator offset voltage signal determiner, and a logic unit, wherein the determiner induces an electrical current via an offset voltage, the A/D converter measures the current, and the logic unit calculates a resistance of the photosensor array based on the reference voltage and the measured current.Type: ApplicationFiled: July 11, 2013Publication date: November 7, 2013Inventors: Marc CHAPPO, Randall P. LUHTA, Christopher J. VRETTOS, Brian E. HARWOOD
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Patent number: 8563941Abstract: An imaging detector includes processing electronics with a thermal coefficient about equal to a negative of a summation of thermal coefficients of a photosensor array and a scintillator array of the detector. In another instance, the imaging detector includes an A/D converter that alternately converts first charge corresponding to impinging radiation into a first signal and second charge corresponding to decaying charge into a second signal and a logic unit that corrects the first signal based on the second signal. In another instance, the imaging detector includes an A/D converter, an integrator offset voltage signal determiner, and a logic unit, wherein the determiner induces an electrical current via an offset voltage, the A/D converter measures the current, and the logic unit calculates a resistance of the photosensor array based on the reference voltage and the measured current.Type: GrantFiled: July 11, 2013Date of Patent: October 22, 2013Assignee: Koninklijke Philips N.V.Inventors: Marc Chappo, Randall P. Luhta, Christopher J. Vrettos, Brian E. Harwood
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Patent number: 8532251Abstract: An imaging system (100) includes a radiation source (108) that emits radiation that traverses an examination region (106) and a detection system (114) that detects radiation that traverses the examination region (106) and generates a signal indicative thereof. The detection system (114) includes a first detector array (1141-114N) and a second detector array (1141-114N). The first and second detector arrays (1141-114N) are separately distinct detector arrays and at least one of the detector arrays (1141-114N) is moveable with respect to the radiation beam. A reconstructor (116) reconstructs the signal and generates volumetric image data indicative thereof.Type: GrantFiled: April 15, 2010Date of Patent: September 10, 2013Assignee: Koninklijke Philips N.V.Inventors: Randall P. Luhta, Marc A. Chappo, Brian E. Harwood, Rodney A. Mattson, Chris John Vrettos
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Patent number: 8525119Abstract: A radiation sensitive detector array includes a plurality of detector modules (118) extending along a z-axis direction and aligned along an x-axis direction with respect to the imaging system (100). At least one of the detector modules (118) includes a module backbone (124) and at least one detector tile (122). The at least one detector tile (122) is coupled to the module backbone (124) through a non-threaded fastener (142). The at least one detector tile (122) includes a two-dimensional detector (126) and a two-dimensional anti-scatter grid (128) that is focused at a focal spot (112) of an imaging system (100).Type: GrantFiled: April 14, 2010Date of Patent: September 3, 2013Assignee: Koninklijke Philips N. V.Inventors: Randall P. Luhta, Rodney A. Mattson, Brian E. Harwood
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Patent number: 8525122Abstract: An imaging detector includes processing electronics (208) with a thermal coefficient about equal to a negative of a summation of thermal coefficients of a photosensor array (204) and a scintillator array (202) of the detector. In another instance, the imaging detector includes an A/D converter (302) that alternately converts first charge corresponding to impinging radiation into a first signal and second charge corresponding to decaying charge into a second signal and a logic unit (308) that corrects the first signal based on the second signal. In another instance, the imaging detector includes an A/D converter (302), an integrator offset voltage signal determiner (318), and a logic unit (308), wherein the determiner (318) induces an electrical current via an offset voltage, the A/D converter (302) measures the current, and the logic unit (308) calculates a resistance of the photosensor array (204) based on the reference voltage and the measured current.Type: GrantFiled: February 18, 2010Date of Patent: September 3, 2013Assignee: Koninklijke Philips N.V.Inventors: Marc Chappo, Randall P. Luhta, Christopher J. Vrettos, Brian E. Harwood
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Publication number: 20120057670Abstract: An imaging system (100) includes a radiation source (108) that emits radiation that traverses an examination region (106) and a detection system (114) that detects radiation that traverses the examination region (106) and generates a signal indicative thereof. The detection system (114) includes a first detector array (1141-114N) and a second detector array (1141-114N). The first and second detector arrays (1141-114N) are separately distinct detector arrays and at least one of the detector arrays (1141-114N) is moveable with respect to the radiation beam. A reconstructor (116) reconstructs the signal and generates volumetric image data indicative thereof.Type: ApplicationFiled: April 15, 2010Publication date: March 8, 2012Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.Inventors: Randall P. Luhta, Marc A. Chappo, Brian E. Harwood, Rodney A. Mattson, Chris John Vrettos
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Publication number: 20120049074Abstract: A radiation sensitive detector array includes a plurality of detector modules (118) extending along a z-axis direction and aligned along an x-axis direction with respect to the imaging system (100). At least one of the detector modules (118) includes a module backbone (124) and at least one detector tile (122). The at least one detector tile (122) is coupled to the module backbone (124) through a non-threaded fastener (142). The at least one detector tile (122) includes a two-dimensional detector (126) and a two-dimensional anti-scatter grid (128) that is focused at a focal spot (112) of an imaging system (100).Type: ApplicationFiled: April 14, 2010Publication date: March 1, 2012Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.Inventors: Randall P. Luhta, Rodney A. Mattson, Brian E. Harwood
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Publication number: 20120001076Abstract: An imaging detector includes processing electronics with a thermal coefficient about equal to a negative of a summation of thermal coefficients of a photosensor array and a scintillator array of the detector. In another instance, the imaging detector includes an A/D converter that alternately converts first charge corresponding to impinging radiation into a first signal and second charge corresponding to decaying charge into a second signal and a logic unit that corrects the first signal based on the second signal. In another instance, the imaging detector includes an A/D converter, an integrator offset voltage signal determiner, and a logic unit, wherein the determiner induces an electrical current via an off-set voltage, the A/D converter measures the current, and the logic unit calculates a resistance of the photosensor array based on the reference voltage and the measured current.Type: ApplicationFiled: February 18, 2010Publication date: January 5, 2012Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.Inventors: Marc Chappo, Randall P. Luhta, Christopher J. Vrettos, Brian E. Harwood
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Patent number: 7873144Abstract: A radiographic imaging apparatus (10) comprises a primary radiation source (14) which projects a beam of radiation into an examination region (16). A detector (18) converts detected radiation passing through the examination region (16) into electrical detector signals representative of the detected radiation. The detector (18) has at least one temporally changing characteristic such as an offset B(t) or gain A(t). A grid pulse means (64) turns the primary radiation source (14) ON and OFF at a rate between 1000 and 5000 pulses per second, such that at least the offset B(t) is re-measured between 1000 and 5000 times per second and corrected a plurality of times during generation of the detector signals. The gain A(t) is measured by pulsing a second pulsed source (86, 100, 138) of a constant intensity (XRef) with a second pulse means (88). The gain A(t) is re-measured and corrected a plurality of times per second during generation of the detector signals.Type: GrantFiled: December 5, 2005Date of Patent: January 18, 2011Assignee: Koninklijke Philips Electronics N.V.Inventors: Randall P. Luhta, Marc A. Chappo, Brian E. Harwood, Rodney A. Mattson, Chris J. Vrettos
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Publication number: 20090238330Abstract: A radiographic imaging apparatus (10) comprises a primary radiation source (14) which projects a beam of radiation into an examination region (16). A detector (18) converts detected radiation passing through the examination region (16) into electrical detector signals representative of the detected radiation. The detector (18) has at least one temporally changing characteristic such as an offset B(t) or gain A(t). A grid pulse means (64) turns the primary radiation source (14) ON and OFF at a rate between 1000 and 5000 pulses per second, such that at least the offset B(t) is re-measured between 1000 and 5000 times per second and corrected a plurality of times during generation of the detector signals. The gain A(t) is measured by pulsing a second pulsed source (86, 100, 138) of a constant intensity (XRef) with a second pulse means (88). The gain A(t) is re-measured and corrected a plurality of times per second during generation of the detector signals.Type: ApplicationFiled: December 5, 2005Publication date: September 24, 2009Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.Inventors: Randall P. Luhta, Marc A. Chappo, Brian E. Harwood, Rodney A. Mattson, Chris J. Vrettos
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Publication number: 20090121146Abstract: A radiation detector module (22) particularly well suited for use in computed tomography (CT) applications includes a scintillator (200), a photodetector array (202), and signal processing electronics (205). The photodetector array (202) includes a semiconductor substrate (208) having a plurality of photodetectors and metalization (210) fabricated on non-illuminated side of the substrate (208). The metalization routes electrical signals between the photodetectors and the signal processing electronics (205) and between the signal processing electronics (205) and an electrical connector (209).Type: ApplicationFiled: March 8, 2007Publication date: May 14, 2009Applicant: KONINKLIJKE PHILIPS ELECTRONICS N. V.Inventors: Randall P. Luhta, Marc A. Chappo, Brian E. Harwood, Rodney A. Mattson, Chris John Vrettos