Patents by Inventor John Yorkston

John Yorkston 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).

  • Patent number: 8210745
    Abstract: An apparatus for cone beam computed tomography of lower leg portions of a patient has a radiation source and a source transport actuable to move the source along an arcuate source path within a housing, from one side of a circumferential gap to the other and has a radius R2 about a center. A housing is provided for placement of the patient's foot. A digital radiation detector has a detector transport actuable to move the detector along an arcuate detector path within the housing, the detector path having a radius R1 about the center and concentric with the source path, wherein R1 is less than R2, and wherein the detector path extends from one side of the pedestal indent to the other. A gap closure apparatus is movable to a position that continues the detector path across the circumferential gap and encloses the detector path.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: July 3, 2012
    Inventors: John Yorkston, William F. Snyder, Jeffrey H. Siewerdsen
  • Patent number: 8184877
    Abstract: A method is disclosed for generating a composite image from dual-energy projection radiographic image data and renormalizing the composite image such that the pixel values for the composite image have the same relationship to the detected x-ray energy as the original high- and low-energy images. The method disclosed further provides for renormalization of material specific decomposition images formed form dual energy projection radiographic image data such that the decomposition images are on a common scale with either the high-energy, low-energy or composite image.
    Type: Grant
    Filed: February 11, 2008
    Date of Patent: May 22, 2012
    Assignee: Carestream Health, Inc.
    Inventors: Richard Lawrence VanMetter, John Yorkston, Jeffery H. Siewersden
  • Publication number: 20120019512
    Abstract: A method for 3-D volume image reconstruction of a subject, executed at least in part on a computer, obtains image data for 2-D projection images over a range of scan angles. For each of the plurality of projection images, a noise-corrected projection image is generated by steps of transforming the image data according to a variance-stabilizing transform to provide transformed image data, applying Gaussian based noise suppression to the transformed image data, and inverting the transformation of the noise-suppressed transformed image data to generate the noise-corrected projection image. The noise-corrected projection image is stored in a computer-accessible memory.
    Type: Application
    Filed: July 22, 2010
    Publication date: January 26, 2012
    Inventors: Dong Yang, Nathan J. Packard, Robert A. Senn, John Yorkston, David H. Foos
  • Publication number: 20110228901
    Abstract: An apparatus for cone beam computed tomography of lower leg portions of a patient has a radiation source and a source transport actuable to move the source along an arcuate source path within a housing, from one side of a circumferential gap to the other and has a radius R2 about a center. A housing is provided for placement of the patient's foot. A digital radiation detector has a detector transport actuable to move the detector along an arcuate detector path within the housing, the detector path having a radius R1 about the center and concentric with the source path, wherein R1 is less than R2, and wherein the detector path extends from one side of the pedestal indent to the other. A gap closure apparatus is movable to a position that continues the detector path across the circumferential gap and encloses the detector path.
    Type: Application
    Filed: March 31, 2011
    Publication date: September 22, 2011
    Inventors: John Yorkston, William F. Snyder, Jeffrey H. Siewerdsen
  • Patent number: 8019044
    Abstract: Acquisition techniques for dual energy (DE) chest imaging system. Technique factors include the added x-ray filtration, kVp pair, and the allocation of dose between low- and high-energy projections, with total dose equal to or less than that of a conventional chest radiograph. Factors are described which maximize lung nodule detectability as characterized by the signal difference to noise ratio (SDNR) in DE chest images. kVp pair and dose allocation are described using a chest phantom presenting simulated lung nodules and ribs for thin, average, and thick body habitus. Low- and high-energy techniques ranged from 60-90 kVp and 120-150 kVp, respectively, with peak soft-tissue SDNR achieved at [60/120] kVp for patient thicknesses and levels of imaging dose. A strong dependence on the kVp of the low-energy projection was observed.
    Type: Grant
    Filed: February 13, 2009
    Date of Patent: September 13, 2011
    Inventors: Nick A. Shkumat, Jeffrey H. Siewerdsen, John Yorkston, Richard L. Van Metter
  • Publication number: 20110176715
    Abstract: A method for obtaining a 3-D image. An initial volume image is obtained of a subject wherein the subject is stationary and in a first pose. One or more 2-D images of the subject are obtained as the subject is moving between the first pose and a second pose. An endpoint volume image of the subject with the subject stationary and in the second pose is obtained. At least the initial volume image is modified according to the one or more obtained 2-D images to form at least one intermediate volume image that is representative of the subject's position between the first and second pose. The at least one intermediate volume image can be displayed.
    Type: Application
    Filed: December 17, 2010
    Publication date: July 21, 2011
    Inventors: David H. Foos, Jeffrey H. Siewerdsen, John Yorkston, Dong Yang
  • Publication number: 20110033101
    Abstract: A method for providing a diagnostic image as a combination of two or more images executed, at least in part, on a control logic processor. The method includes obtaining at least first and second image data of a subject and analyzing both the first and second image data to identify at least grid orientation and spacing. Grid suppression is applied to the first and second image data and the grid suppressed first and second image data is pre-processed. The method then combines the grid suppressed first and second image data and decomposes the combined data to obtain one or more diagnostic images for display. The one or more diagnostic images are displayed on a display that is associated with the control logic processor.
    Type: Application
    Filed: July 21, 2010
    Publication date: February 10, 2011
    Inventors: David H. Foos, John Yorkston, Xiaohuo Wang
  • Patent number: 7834321
    Abstract: A radiographic imaging apparatus for taking X-ray images of an object includes a front panel and back panel. The panels have substrates, arrays of signal sensing elements and readout devices, and passivation layers. The front and back panels have scintillating phosphor layers responsive to X-rays passing through an object produce light which illuminates the signal sensing elements to provide signals representing X-ray images. The X-ray apparatus has means for combining the signals of the X-ray images to produce a composite X-ray image. Furthermore, the composition and thickness of the scintillating phosphor layers are selected, relative to each other, to improve the diagnostic efficacy of the composite X-ray image. Alternatively, a radiographic imaging apparatus has a single panel having arrays of signal sensing elements and readout devices and scintillating phosphor layers that are disposed on both sides of a single substrate.
    Type: Grant
    Filed: July 14, 2006
    Date of Patent: November 16, 2010
    Assignee: Carestream Health, Inc.
    Inventors: John Yorkston, Kwok-Leung Yip, Timothy J. Wojcik
  • Publication number: 20100278300
    Abstract: An apparatus for cone beam computed tomography of an extremity has a digital radiation detector and a first device to move the detector along a circular detector path extending so that the detector moves both at least partially around a first extremity of the patient and between the first extremity and a second, adjacent extremity. The detector path has radius R1 sufficient to position the extremity approximately centered in the detector path. There is a radiation source with a second device to move the source along a concentric circular source path having a radius R2 greater than radius R1, radius R2 sufficiently long to allow adequate radiation exposure of the first extremity for an image capture by the detector. A first circumferential gap in the source path allows the second extremity to be positioned in the first circumferential gap during image capture.
    Type: Application
    Filed: April 30, 2010
    Publication date: November 4, 2010
    Inventors: John Yorkston, Robert Asento, Jeffrey H. Siewerdsen, David H. Foos
  • Publication number: 20100080355
    Abstract: A method is disclosed for acquiring a high speed dual-energy image pair using a pixilated digital detector. A single pixilated digital detector acquires and encodes two separate images in effectively one image, eliminating the need to read out a first image prior to acquiring a second image. The encoded information is then utilized to obtain two distinct dual-energy images which may be decomposed to form bone and soft-tissue only images.
    Type: Application
    Filed: September 29, 2008
    Publication date: April 1, 2010
    Inventors: John Yorkston, David H. Foos, Xiaohui Wang
  • Patent number: 7623628
    Abstract: Methods are provided for cardiac gating of multiple-energy projection radiographic imaging utilizing an apparatus that measures the patient's peripheral blood perfusion. The choice of methods is dependant on the patient's heart rate and the delays inherent in the imaging system. A first method allows for imaging during the diastole period of the current cardiac cycle. A second method provides an implemented delay to acquire the image during the diastole period of a subsequent cardiac cycle. The use of the apparatus that measures the patient's peripheral blood perfusion allows for an efficient and convenient means of cardiac gating while avoiding occlusion of diagnostically important anatomy.
    Type: Grant
    Filed: December 6, 2007
    Date of Patent: November 24, 2009
    Assignee: Carestream Health, Inc.
    Inventors: Richard L. VanMetter, Jeffrey H. Siewerdsen, Nick A. Shkumat, John Yorkston
  • Publication number: 20090207966
    Abstract: Acquisition techniques for dual energy (DE) chest imaging system. Technique factors include the added x-ray filtration, kVp pair, and the allocation of dose between low- and high-energy projections, with total dose equal to or less than that of a conventional chest radiograph. Factors are described which maximize lung nodule detectability as characterized by the signal difference to noise ratio (SDNR) in DE chest images. kVp pair and dose allocation are described using a chest phantom presenting simulated lung nodules and ribs for thin, average, and thick body habitus. Low- and high-energy techniques ranged from 60-90 kVp and 120-150 kVp, respectively, with peak soft-tissue SDNR achieved at [60/120] kVp for patient thicknesses and levels of imaging dose. A strong dependence on the kVp of the low-energy projection was observed.
    Type: Application
    Filed: February 13, 2009
    Publication date: August 20, 2009
    Inventors: Nick A. Shkumat, Jeffrey H. Siewerdsen, John Yorkston, Richard L. Van Metter
  • Patent number: 7569832
    Abstract: A radiographic imaging device has a first scintillating phosphor screen having a first thickness and a second scintillating phosphor screen having a second thickness. A transparent substrate is disposed between the first and second screens. An imaging array formed on a side of the substrate includes multiple photosensors and an array of readout elements.
    Type: Grant
    Filed: April 14, 2008
    Date of Patent: August 4, 2009
    Assignee: Carestream Health, Inc.
    Inventors: Timothy John Tredwell, Roger Stanley Kerr, Robert W. Kulpinski, John Yorkston, Timothy John Wojcik, Kwok-Leung Yip
  • Publication number: 20080245968
    Abstract: A radiographic imaging device has a first scintillating phosphor screen having a first thickness and a second scintillating phosphor screen having a second thickness. A transparent substrate is disposed between the first and second screens. An imaging array formed on a side of the substrate includes multiple photosensors and an array of readout elements.
    Type: Application
    Filed: April 14, 2008
    Publication date: October 9, 2008
    Inventors: Timothy John Tredwell, Roger Stanley Kerr, Robert W. Kulpinski, John Yorkston, Timothy John Wojcik, Kwok-Leung Yip
  • Publication number: 20080198964
    Abstract: Methods are provided for cardiac gating of multiple-energy projection radiographic imaging utilizing an apparatus that measures the patient's peripheral blood perfusion. The choice of methods is dependant on the patient's heart rate and the delays inherent in the imaging system. A first method allows for imaging during the diastole period of the current cardiac cycle. A second method provides an implemented delay to acquire the image during the diastole period of a subsequent cardiac cycle. The use of the apparatus that measures the patient's peripheral blood perfusion allows for an efficient and convenient means of cardiac gating while avoiding occlusion of diagnostically important anatomy.
    Type: Application
    Filed: December 6, 2007
    Publication date: August 21, 2008
    Inventors: Richard L. VanMetter, Jeffrey H. Siewerdsen, Nick A. Shkumat, John Yorkston
  • Publication number: 20080192898
    Abstract: A method is disclosed for generating a composite image from dual-energy projection radiographic image data and renormalizing the composite image such that the pixel values for the composite image have the same relationship to the detected x-ray energy as the original high- and low-energy images. The method disclosed further provides for renormalization of material specific decomposition images formed form dual energy projection radiographic image data such that the decomposition images are on a common scale with either the high-energy, low-energy or composite image.
    Type: Application
    Filed: February 11, 2008
    Publication date: August 14, 2008
    Inventors: Richard Lawrence VanMetter, John Yorkston, Jeffery H. Siewersden
  • Publication number: 20080011960
    Abstract: The present invention relates to radiographic imaging apparatus for taking X-ray images of an object. In various two-panel radiographic imaging apparatus configurations, a front panel and back panel have substrates, arrays of signal sensing elements and readout devices, and passivation layers. The front and back panels have scintillating phosphor layers responsive to X-rays passing through an object produce light which illuminates the signal sensing elements to provide signals representing X-ray images. The X-ray apparatus has means for combining the signals of the X-ray images to produce a composite X-ray image. Furthermore, the composition and thickness of the scintillating phosphor layers are selected, relative to each other, to improve the diagnostic efficacy of the composite X-ray image. Alternatively, a radiographic imaging apparatus has a single panel having arrays of signal sensing elements and readout devices and scintillating phosphor layers that are disposed on both sides of a single substrate.
    Type: Application
    Filed: July 14, 2006
    Publication date: January 17, 2008
    Inventors: John Yorkston, Kwok-Leung Yip, Timothy J. Wojcik
  • Patent number: 7265355
    Abstract: Apparatus for acquiring an elongated radiographic image. The apparatus includes a flat panel electronic detector of radiographic images, the detector having a known length; and a transport mechanism for mounting the detector for movement in a direction parallel to the known length so that the detector can be positioned in sequential contiguous partially-overlapping positions to acquire a radiation image greater in length than the detector length. At least one marker is disposed in a region corresponding with each partially-overlapping position of the detector.
    Type: Grant
    Filed: November 12, 2004
    Date of Patent: September 4, 2007
    Assignee: Carestream Health, Inc.
    Inventors: Yun C. Chang, John Yorkston, David H. Foos
  • Patent number: 7211802
    Abstract: A wireless, independent digital imaging sensor utilizes an external charge balance capacitor to establish a sense voltage at a common node between the charge capacitor and the pixel intrinsic capacitors in the sensor panel. A variable width pulse train responds to the sense voltage to control injection of charge to the external capacitor to maintain a constant voltage at the common equal to a reference voltage. An increase in pulse width above a threshold level representative of the onset of X-ray exposure is detected to generate an output control signal used to control subsequent image acquisition functions of the imaging sensor.
    Type: Grant
    Filed: December 30, 2005
    Date of Patent: May 1, 2007
    Assignee: Eastman Kodak Company
    Inventors: Sreeram Dhurjaty, Gordon Geisbuesch, John Yorkston, Joshua M. Silbermann, Jeffery R. Hawver
  • Patent number: 7211803
    Abstract: A wireless X-ray detector for a digital radiography system with remote detection of impinging radiation from the system X-ray source onto a sensor panel having amorphous or crystalline silicon photodiodes or metal insulated semiconductor (MIS) sensors. Changes in current in the photodiode bias supply circuit is sensed to generate a signal indicating presence of radiation. Improved detection of X-ray cessation is achieved either by leaving at least one line of sensors connected between the bias supply circuit to a virtual ground during charge accumulation or by using an X-ray presence detector circuit that increases the sensitivity of the detector circuit to bias circuit current changes occurring after onset of the radiation.
    Type: Grant
    Filed: April 24, 2006
    Date of Patent: May 1, 2007
    Assignee: Eastman Kodak Company
    Inventors: Sreeram Dhurjaty, John Yorkston