Patents by Inventor Farhad Ghelmansarai
Farhad Ghelmansarai 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: 8729483Abstract: Certain embodiments described herein are directed to devices and systems that can be used for direct and indirect detection of radiation such as X-rays. In certain examples, the device can include a modulator optically coupled to a sensor. In some examples, the modulator can be configured to switch between different states to provide an imaging signal in one state and a dosimetry signal in another state.Type: GrantFiled: April 1, 2013Date of Patent: May 20, 2014Assignee: Perkinelmer Holdings, Inc.Inventor: Farhad Ghelmansarai
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Patent number: 8712014Abstract: A method for adaptive frame scanning for pulsed x-ray imaging comprising the steps of: scanning lines on an image detector sequentially; receiving an indication that radiation is about to begin; waiting a fixed delay after the indication is received; suspending scanning after the fixed delay has lapsed; and resuming scanning of lines on the detector upon receiving an indication that radiation has stopped. By monitoring for completion of a frame a predetermined frame delay can be added before commencing the next line scan to accommodate jitter in the radiation pulse timing.Type: GrantFiled: August 4, 2010Date of Patent: April 29, 2014Assignee: PerkinElmer Holdings, Inc.Inventor: Farhad Ghelmansarai
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Patent number: 8436313Abstract: Certain embodiments described herein are directed to devices and systems that can be used for direct and indirect detection of radiation such as X-rays. In certain examples, the device can include a modulator optically coupled to a sensor. In some examples, the modulator can be configured to switch between different states to provide an imaging signal in one state and a dosimetry signal in another state.Type: GrantFiled: June 24, 2011Date of Patent: May 7, 2013Assignee: PerkinElmer Holdings, Inc.Inventor: Farhad Ghelmansarai
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Publication number: 20120326044Abstract: Certain embodiments described herein are directed to devices and systems that can be used for direct and indirect detection of radiation such as X-rays. In certain examples, the device can include a modulator optically coupled to a sensor. In some examples, the modulator can be configured to switch between different states to provide an imaging signal in one state and a dosimetry signal in another state.Type: ApplicationFiled: June 24, 2011Publication date: December 27, 2012Applicant: PERKINELMER HOLDINGS, INC.Inventor: Farhad Ghelmansarai
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Publication number: 20120033793Abstract: A method for adaptive frame scanning for pulsed x-ray imaging comprising the steps of: scanning lines on an image detector sequentially; receiving an indication that radiation is about to begin; waiting a fixed delay after the indication is received; suspending scanning after the fixed delay has lapsed; and resuming scanning of lines on the detector upon receiving an indication that radiation has stopped. By monitoring for completion of a frame a predetermined frame delay can be added before commencing the next line scan to accommodate jitter in the radiation pulse timing.Type: ApplicationFiled: August 4, 2010Publication date: February 9, 2012Applicant: PerkinElmer Holdings, Inc.Inventor: Farhad Ghelmansarai
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Patent number: 7671342Abstract: X-ray portal imaging detectors have multiple layers, such as multiple layers of phosphor screens and/or detectors. Some x-rays that pass through one layer are detected or converted into light energies in a different layer. For example, one phosphor screen is provided in front and another behind that panel detector circuitry. Light generated in each of the phosphor screens is detected by the same detector circuitry. As another example, multiple layers of phosphor screens and associated detector circuits are provided. Some x-rays passing through one layer may be detected in a different layer. High energy x-rays associated with Megavoltage sources as well as lower or higher energy x-rays may be detected.Type: GrantFiled: January 11, 2005Date of Patent: March 2, 2010Assignee: Siemens Medical Solutions USA, Inc.Inventors: Ali Bani-Hashemi, Farhad A. Ghelmansarai
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Patent number: 7486983Abstract: A system to acquire a first image of a radiation field, the radiation field produced by a radiation beam, and to determine a second image based on the first image and based on a reference image of a reference radiation field having substantially homogeneous intensity, the second image representing characteristics of the radiation beam. Some embodiments provide acquisition of a first profile associated with a radiation beam using a radiation detection device, acquisition of a first image of a first radiation field produced by the radiation beam using an imaging device, determination of a map between the first image and the first profile, acquisition a second image of a second radiation field using the imaging device, and determination of a second profile based on the map and the second image.Type: GrantFiled: February 12, 2003Date of Patent: February 3, 2009Assignee: Siemens Medical Solutions USA, Inc.Inventors: Farhad A. Ghelmansarai, Francisco Miguel Hernandez-Guerra
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Patent number: 7397044Abstract: Some embodiments include reception of a first instruction to enter an imaging mode, and, in response to the first instruction, automatic performance of at least one of: reduction of a focal spot size of a radiation beam, movement of a flattening filter out of a path of the radiation beam, replacement of a first target for photon emission with a second target for photon emission, or movement of a scatter-reducing filter into the path of the radiation beam. Embodiments may further include reception of a second instruction to enter a first radiation treatment mode, and, in response to the second instruction, automatic performance at least one of: increase of a focal spot size of the radiation beam, movement of the flattening filter into the path of the radiation beam, replacement of the second target with the first target, or movement of the scatter-reducing filter out of the path of the radiation beam.Type: GrantFiled: July 21, 2005Date of Patent: July 8, 2008Assignee: Siemens Medical Solutions USA, Inc.Inventors: Edward Lewis Calderon, Francisco M. Hernadez-Guerra, Ali Bani-Hashemi, Farhad A. Ghelmansarai
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Patent number: 7263165Abstract: A radiation imaging device includes a detector capable of detecting radiation from either a KV source or an MV source. The detector includes a photodetector assembly, a scintillator adjacent to a first side of the photodetector, and a metal plate adjacent to a second side of the photodetector. The detector may also include a second scintillator. The first side of the photodetector assembly is positioned toward the KV source for KV imaging, while the second side is positioned toward the MV source for MV imaging. The radiation imaging device includes a first gantry for the MV source and a second gantry for the detector. The KV source may be supported by either the first gantry or the second gantry. The second gantry includes a robotic arm for positioning the detector for imaging, and is configured for moving the detector (and the KV source) out of the MV beam.Type: GrantFiled: July 14, 2005Date of Patent: August 28, 2007Assignee: Siemens Medical Solutions USA, Inc.Inventor: Farhad Ghelmansarai
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Patent number: 7263164Abstract: A system includes acquisition of a first image of a first radiation field, at least a portion of the first radiation field comprising radiation attenuated by a device, and the first image including a representation of first scatter radiation generated during acquisition of the first image, acquisition of a second image of a second radiation field, at least a portion of the second radiation field comprising radiation attenuated by a volume corresponding to the device, and the second image including a representation of second scatter radiation generated during acquisition of the second image, and modification of the second image based on the first image to compensate for the second scatter radiation.Type: GrantFiled: April 30, 2004Date of Patent: August 28, 2007Assignee: Siemens Medical Solutions USA, Inc.Inventors: Farhad A. Ghelmansarai, Johannes Stahl, Dieter Manthey
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Patent number: 7242742Abstract: Some embodiments include a particle source, an RF power source, an accelerator waveguide, and an imaging device. The particle source is to generate a first injector current and a second injector current, the first injector current being less than the second injector current. The RF power source is to generate first RF power at a first pulse rate and second RF power at a second pulse rate, the first pulse rate being greater than the second pulse rate. The accelerator waveguide is to accelerate a first electron beam based on the first injector current and the first RF power and to accelerate a second electron beam based on the second injector current and the second RF power, and the imaging device is to acquire an image based on the first electron beam. The second electron beam may be used to deliver treatment radiation to a patient.Type: GrantFiled: July 21, 2005Date of Patent: July 10, 2007Assignee: Siemens Medical Solutions USA, Inc.Inventors: Edward Lewis Calderon, Francisco M. Hernandez-Guerra, Ali Bani-Hashemi, Farhad A. Ghelmansarai
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Publication number: 20070025513Abstract: A radiation imaging device includes a detector capable of detecting radiation from either a KV source or an MV source. The detector includes a photodetector assembly, a scintillator adjacent to a first side of the photodetector, and a metal plate adjacent to a second side of the photodetector. The detector may also include a second scintillator. The first side of the photodetector assembly is positioned toward the KV source for KV imaging, while the second side is positioned toward the MV source for MV imaging. The radiation imaging device includes a first gantry for the MV source and a second gantry for the detector. The KV source may be supported by either the first gantry or the second gantry. The second gantry includes a robotic arm for positioning the detector for imaging, and is configured for moving the detector (and the KV source) out of the MV beam.Type: ApplicationFiled: July 14, 2005Publication date: February 1, 2007Inventor: Farhad Ghelmansarai
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Publication number: 20070018111Abstract: Some embodiments include a particle source, an RF power source, an accelerator waveguide, and an imaging device. The particle source is to generate a first injector current and a second injector current, the first injector current being less than the second injector current. The RF power source is to generate first RF power at a first pulse rate and second RF power at a second pulse rate, the first pulse rate being greater than the second pulse rate. The accelerator waveguide is to accelerate a first electron beam based on the first injector current and the first RF power and to accelerate a second electron beam based on the second injector current and the second RF power, and the imaging device is to acquire an image based on the first electron beam. The second electron beam may be used to deliver treatment radiation to a patient.Type: ApplicationFiled: July 21, 2005Publication date: January 25, 2007Inventors: Edward Calderon, Francisco Hernandez-Guerra, Ali Bani-Hashemi, Farhad Ghelmansarai
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Publication number: 20070018117Abstract: Some embodiments include reception of a first instruction to enter an imaging mode, and, in response to the first instruction, automatic performance of at least one of: reduction of a focal spot size of a radiation beam, movement of a flattening filter out of a path of the radiation beam, replacement of a first target for photon emission with a second target for photon emission, or movement of a scatter-reducing filter into the path of the radiation beam. Embodiments may further include reception of a second instruction to enter a first radiation treatment mode, and, in response to the second instruction, automatic performance at least one of: increase of a focal spot size of the radiation beam, movement of the flattening filter into the path of the radiation beam, replacement of the second target with the first target, or movement of the scatter-reducing filter out of the path of the radiation beam.Type: ApplicationFiled: July 21, 2005Publication date: January 25, 2007Inventors: Edward Calderon, Francisco Hernadez-Guerra, Ali Bani-Hashemi, Farhad Ghelmansarai
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Publication number: 20060151708Abstract: X-ray portal imaging detectors have multiple layers, such as multiple layers of phosphor screens and/or detectors. Some x-rays that pass through one layer are detected or converted into light energies in a different layer. For example, one phosphor screen is provided in front and another behind that panel detector circuitry. Light generated in each of the phosphor screens is detected by the same detector circuitry. As another example, multiple layers of phosphor screens and associated detector circuits are provided. Some x-rays passing through one layer may be detected in a different layer. High energy x-rays associated with Megavoltage sources as well as lower or higher energy x-rays may be detected.Type: ApplicationFiled: January 11, 2005Publication date: July 13, 2006Inventors: Ali Bani-Hashemi, Farhad Ghelmansarai
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Publication number: 20050243963Abstract: A system includes acquisition of a first image of a first radiation field, at least a portion of the first radiation field comprising radiation attenuated by a device, and the first image including a representation of first scatter radiation generated during acquisition of the first image, acquisition of a second image of a second radiation field, at least a portion of the second radiation field comprising radiation attenuated by a volume corresponding to the device, and the second image including a representation of second scatter radiation generated during acquisition of the second image, and modification of the second image based on the first image to compensate for the second scatter radiation.Type: ApplicationFiled: April 30, 2004Publication date: November 3, 2005Inventors: Farhad Ghelmansarai, Johannes Stahl, Dieter Manthey
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Patent number: 6925149Abstract: A system for capturing an image of transmitted radiation includes transmission of a disable signal to disable a bias light of a camera at a time prior to transmission of radiation, and acquisition of an image from the camera during transmission of the radiation and during deactivation of the bias light. In some embodiments, the disable signal is transmitted in response to the reception of a pre-radiation signal, the pre-radiation signal indicating that transmission of the radiation will commence approximately one frame scan time after the pre-radiation signal is received, and the disable signal is transmitted approximately when the pre-radiation signal is received.Type: GrantFiled: July 30, 2002Date of Patent: August 2, 2005Assignee: Siemens Medical Solutions USA, Inc.Inventor: Farhad A. Ghelmansarai
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Publication number: 20050094768Abstract: X-ray therapy EPI artifact reduction and control of imaging is provided. Scanning of images is synchronized with the pulse rate of the x-rays. The scanning period is longer than the pulse rate period, so artifacts are generated within the resulting images. Due to the synchronization, the pulse variation artifacts are aligned across multiple images. The synchronization and resulting alignment of linear artifacts allows for gain correction as a function of lines within the image. Such gain correction reduces or removes non-linearities associated with pulse rate variation.Type: ApplicationFiled: November 3, 2004Publication date: May 5, 2005Inventors: Farhad Ghelmansarai, William Collins
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Publication number: 20040167388Abstract: A system includes activation of a local light emitter to emit local light, activation of a radiation emitter to emit radiation, and acquisition of an image based on the emitted radiation and on the local light. According to some embodiments, the emitted radiation is converted to second light, the local light and the second light are combined to create combined light, and the image is acquired based on the combined light.Type: ApplicationFiled: February 25, 2003Publication date: August 26, 2004Applicant: Siemens Medical Solutions USA, Inc.Inventor: Farhad A. Ghelmansarai
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Publication number: 20040158145Abstract: A system to acquire a first image of a radiation field, the radiation field produced by a radiation beam, and to determine a second image based on the first image and based on a reference image of a reference radiation field having substantially homogeneous intensity, the second image representing characteristics of the radiation beam. Some embodiments provide acquisition of a first profile associated with a radiation beam using a radiation detection device, acquisition of a first image of a first radiation field produced by the radiation beam using an imaging device, determination of a map between the first image and the first profile, acquisition a second image of a second radiation field using the imaging device, and determination of a second profile based on the map and the second image.Type: ApplicationFiled: February 12, 2003Publication date: August 12, 2004Applicant: Siemens Medical Solutions USA, Inc.Inventors: Farhad A. Ghelmansarai, Francisco Miguel Hernandez-Guerra