Plural Sources Patents (Class 378/9)
  • Publication number: 20100310038
    Abstract: The invention relates to a computer tomography system comprising a support structure, more than one source of radiation, a detector array, and a grid, wherein the support structure defines a space to accommodate an object of interest which can be moved through the ring. The object of interest is radiographed by means of the sources of radiation which are located at the perimeter of the support structure and are movable along said perimeter. The sources are arranged displaced behind each other. The detector array is located at the perimeter of the support structure opposite the sources of radiation, and is movable simultaneously with the sources along the perimeter of the ring. The grid is arranged on the side of the detector array, orientated to the sources, to focus detector modules arranged on the detector array. By means of said CT system, improved radiographic images can be achieved from the object of interest.
    Type: Application
    Filed: September 25, 2008
    Publication date: December 9, 2010
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventor: Rolf Karl Otto Behling
  • Patent number: 7848480
    Abstract: An X-ray CT scanner includes X-ray tubes including a first X-ray tube and a second X-ray tube having fan angles different from each other, X-ray detectors including a first X-ray detector and a second X-ray detector which are respectively arranged to face the first X-ray tube and the second X-ray tube, collection data processing means for executing weighting processing to each of pieces of collection data including first collection data obtained by the first X-ray detector and second collection data obtained by the second X-ray detector to generate image data combined to be smooth in a direction corresponding to a channel direction of detection elements provided in the X-ray detectors, and image generating section for performing processing including image reconstruction processing with respect to pieces of collection data weighted by the collection data processing section to generate image data.
    Type: Grant
    Filed: July 12, 2007
    Date of Patent: December 7, 2010
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
    Inventors: Satoru Nakanishi, Naruomi Akino, Yasuo Saito
  • Patent number: 7844027
    Abstract: System and method for XRD-based false alarm resolution in computed tomography (“CT”) threat detection systems. Following a scan of an object with a megavoltage CT-based threat detection system, a suspicious area in the object is identified. The three dimensional position of the suspicious area is used to determine a ray path for the XRD-based threat detection system that provides minimal X-ray attenuation. The object is then positioned for XRD scanning of the suspicious area along this determined ray path. The XRD-based threat detection system is configured to detect high density metals (“HDMs) as well as shielded Special Nuclear Materials (“SNMs”) based on cubic or non-cubic diffraction profiles.
    Type: Grant
    Filed: February 6, 2009
    Date of Patent: November 30, 2010
    Assignee: Morpho Detection, Inc.
    Inventors: Geoffrey Harding, Joseph Bendahan
  • Patent number: 7844032
    Abstract: A collimator includes a first plate having an aperture therein, the aperture configured to allow passage of a beam of x-rays from a source of a multi-spot source therethrough, and a second plate parallelly positioned with respect to the first plate and configured to receive and attenuate a first portion of the beam of x-rays passing through the aperture in the first plate, the second plate having an aperture therein configured to non-concentrically overlap the aperture in the first plate, to receive a second portion of the beam of x-rays passing through the aperture in the first plate, and to allow passage of the second portion of the beam of x-rays therethrough. A portion of the aperture in the first plate and a portion of the aperture in the second plate form a composite aperture parallel to the beam of x-rays, the composite aperture configured to allow passage of the second portion of the beam of x-rays through the first and second plates.
    Type: Grant
    Filed: October 16, 2008
    Date of Patent: November 30, 2010
    Assignee: General Electric Company
    Inventors: Mark E. Vermilyea, Colin R. Wilson, Yun Zou
  • Publication number: 20100290584
    Abstract: When performing nuclear (e.g., SPECT or PET) and CT scans on a patient, a volume cone-beam CT scan is performed using a cone-beam CT X-ray source (20) and an offset flat panel X-ray detector (22). A field of view of the X-ray source overlaps a field of view of two nuclear detector heads (18), and the offset of the X-ray detector (22) minimizes interference with nuclear detector head movement about a rotatable gantry (16). Additionally, a locking mechanism (80) provides automatically locking of the X-ray detector (22) in each of a stowed and operation position, improving safety and CT image quality.
    Type: Application
    Filed: October 29, 2008
    Publication date: November 18, 2010
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: John F. Vesel, Michael J. Petrillo, Ian Farmer, Mahmoud Janbakhsh, Rizwan Hassan, Paul Hug, Joseph J. Stefan, Marc A. Huber
  • Patent number: 7835486
    Abstract: Systems and methods are provided for acquiring and reconstructing projection data that is mathematically complete or sufficient using a computed tomography (CT) system having stationary distributed X-ray sources and detector arrays. In one embodiment, a distributed source is provided as arcuate segments offset in the X-Y plane and along the Z-axis.
    Type: Grant
    Filed: March 20, 2007
    Date of Patent: November 16, 2010
    Assignee: General Electric Company
    Inventors: Samit Kumar Basu, Bruno De Man, Jed Douglas Pack, Xiaoye Wu, Zhye Yin, Peter Michael Edic
  • Patent number: 7831012
    Abstract: An apparatus may comprise a frame supporting at least first and second skewed radiation sources and at least first and second radiation detectors. The first and second radiation detectors may be substantially non-contiguous such that a substantial gap exists between the first and second radiation detectors that is free of any radiation detectors. Each of the first and second radiation detectors may also configured and arranged to detect radiation emitted by each of the first and second skewed radiation sources.
    Type: Grant
    Filed: February 9, 2007
    Date of Patent: November 9, 2010
    Assignee: L-3 Communications Security and Detection Systems Inc.
    Inventors: Andrew D. Foland, Richard Franklin Eilbert, Michael R. Gambini, Boris Oreper, Nikolay Rolshud
  • Publication number: 20100278298
    Abstract: A CT system is disclosed for phase-contrast and absorption imaging with a plurality of emitter-detector systems. In at least one embodiment, there are at least two emitter-detector systems and the at least two emitter-detector systems have a different distance between radiation focus and detector and there is a computational element for calculating phase-contrast images on the basis of the solution to the intensity transport equation. Moreover, at least one embodiment of the invention relates to a method for phase-contrast and absorption imaging using such a CT system by comparing attenuation images recorded at different distances of a detector from a multiplicity of projection angles by solving the intensity transport equation and reconstruction or comparison of two tomographic and three-dimensional image data records, reconstructed from projections, which were recorded at different distances.
    Type: Application
    Filed: April 28, 2010
    Publication date: November 4, 2010
    Inventor: Eckhard Hempel
  • Patent number: 7826585
    Abstract: A computed tomography system includes at least two x-ray sources (108), a at least one common detector (124), and a reconstruction system (136). The at least two x-ray sources (108) are aligned at different z-axis locations at about a same angular position and concurrently emit radiation that traverses an imaging region (116). The at least one detector (124) detects radiation emitted by the at least two x-ray source (108) and generates composite data indicative of the detected radiation. The reconstruction system (136) reconstructs the composite data to generate one or more images.
    Type: Grant
    Filed: July 23, 2007
    Date of Patent: November 2, 2010
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Roland Proksa, Andy Ziegler
  • Patent number: 7826594
    Abstract: A system and method for addressing individual electron emitters in an emitter array is disclosed. The system includes an emitter array comprising a plurality of emitter elements arranged in a non-rectangular layout and configured to generate at least one electron beam and a plurality of extraction grids positioned adjacent to the emitter array, each extraction grid being associated with at least one emitter element to extract the at least one electron beam therefrom. The field emitter array system also includes a plurality of voltage control channels connected to the plurality of emitter elements and the plurality of extraction grids such that each of the emitter elements and each of the extraction grids is individually addressable. In the field emitter array system, the number of voltage control channels is equal to the sum of a pair of integers closest in value whose product equals the number of emitter elements.
    Type: Grant
    Filed: May 1, 2008
    Date of Patent: November 2, 2010
    Assignee: General Electric Company
    Inventors: Yun Zou, Mark E. Vermilyea, Louis Paul Inzinna, Antonio Caiafa
  • Publication number: 20100266097
    Abstract: An X-ray imaging apparatus includes a multi X-ray source which includes a plurality of X-ray focuses to generate X-rays by irradiating X-ray targets with electron beams, a detector which detects X-rays which have been emitted from the multi X-ray source and have reached a detection surface, and a moving mechanism for moving the multi X-ray source within a plane facing the detection surface. The X-ray imaging apparatus acquires a plurality of X-ray detection signals from the detector by causing the multi X-ray source to perform X-ray irradiation while shifting the positions of a plurality of X-ray focuses which the detector has relative to the detection surface by moving the multi X-ray source using the moving mechanism. The apparatus then generates an X-ray projection image based on the plurality of X-ray detection signals acquired by the detector.
    Type: Application
    Filed: April 20, 2010
    Publication date: October 21, 2010
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Masahiko Okunuki, Makoto Sato, Osamu Tsujii, Takashi Ogura, Hisashi Namba
  • Patent number: 7813473
    Abstract: A technique is provided for the temporal interpolation of a projection data set acquired of a dynamic object, such as a heart. The projection data set is acquired using a slowly rotating gantry and a distributed X-ray source. The projection data may be interpolated at each view position to a selected instant of time, such as relative to a cardiac phase. The resulting interpolated projection data characterize the projection data at each view location at any instant in time. The set of interpolated projection data may then be reconstructed to generate images and/or volume with improved temporal resolution.
    Type: Grant
    Filed: July 23, 2003
    Date of Patent: October 12, 2010
    Assignee: General Electric Company
    Inventors: Peter Michael Edic, Bruno De Man, Samit Basu
  • Publication number: 20100254508
    Abstract: In a radioscopic method and device to generate projections of the inside of an examination subject that is located in an examination space of a data acquisition unit, a number of ray beams are generated that are directed toward the examination space and that each exhibit a fan angle in a rotation plane. The number of ray beams are rotated in the rotation plane in a rotation direction the examination space, while the fan angle is varied during the rotation.
    Type: Application
    Filed: April 7, 2010
    Publication date: October 7, 2010
    Inventor: Thomas Von Der Haar
  • Patent number: 7809101
    Abstract: A modular x-ray source for an imaging system includes an electron source mounting plate, two or more electron sources each mounted on and electrically coupled to the electron source mounting plate, and a target block positioned proximately to the two or more electron sources. The source includes two or more targets mounted on and electrically coupled to the target block, each target positioned opposite a respective one of the two or more electron sources to receive a respective beam of electrons therefrom.
    Type: Grant
    Filed: June 6, 2008
    Date of Patent: October 5, 2010
    Assignee: General Electric Company
    Inventors: Kristopher John Frutschy, Yang Cao, Dennis M. Jacobs, Mark E. Vermilyea, Xi Zhang, Yun Zou, Louis Paul Inzinna, Michael Hebert
  • Patent number: 7806589
    Abstract: A high-speed biplane radiography system for in-vivo assessment of joint function is provided. The system can acquire stereo-pair radiographic images at rates from 30-4000 frames per second of nearly any motion or joint. The radiographic equipment can be mounted in a gantry system that provides sufficient positioning flexibility for imaging different joints of a subject's body, along with an imaging area large enough for a variety of dynamic activities (e.g., walking, running, jumping, throwing, etc.). Three-dimensional (3D) bone positions can be determined using software for matching the bones in each X-ray image with 3D models developed from subject-specific CT (computed tomography) scans. This system can provide accurate (e.g., ±0.1 mm) assessment and direct 3D visualization of dynamic joint function, and can overcome limitations of conventional gate or motion analysis.
    Type: Grant
    Filed: September 24, 2008
    Date of Patent: October 5, 2010
    Assignee: University of Pittsburgh
    Inventors: Scott Tashman, Jim Princehorn, Samson Pennatto, William Anderst
  • Publication number: 20100246753
    Abstract: A computed tomography apparatus includes a gantry having a rotary portion and a stationary portion. At least one radiation source and at least one anti-scatter grid are mounted on the rotary portion of the gantry and positioned opposite each other. A detector device is mounted on the stationary portion of the gantry. The detector device may include a plurality of detector sensors arranged in the form of a generally circular ring surrounding the periphery of the rotary portion. Alternatively, the detector device may include a plurality of flat panel detectors arranged in a generally circular geometry.
    Type: Application
    Filed: March 25, 2009
    Publication date: September 30, 2010
    Applicant: Varian Medical Systems, Inc.
    Inventor: Ivan P. Mollov
  • Publication number: 20100246754
    Abstract: The present application discloses an X-ray scanner having an X-ray source arranged to emit X-rays from source points through an imaging volume. The scanner may further include an array of X-ray detectors which may be arranged around the imaging volume and may be arranged to output detector signals in response to the detection of X-rays. The scanner may further include a conveyor arranged to convey an object through the imaging volume in a scan direction, and may also include at least one processor arranged to process the detector signals to produce an image data set defining an image of the object. The image may have a resolution in the scan direction that is at least 90% as high as in one direction, and in some cases two directions, orthogonal to the scan direction.
    Type: Application
    Filed: February 25, 2010
    Publication date: September 30, 2010
    Inventor: Edward James Morton
  • Publication number: 20100239064
    Abstract: Methods, systems, and computer program products for multiplexing computed tomography are disclosed. According to one aspect, the subject matter described herein can include illuminating an object with a plurality of x-ray beams from a plurality of viewing angles, wherein each x-ray beam has a distinct waveform; detecting the x-ray intensities of the plurality of pulsed x-ray beams as a function of time, and extracting individual projection image data from the detected x-ray intensities based on the distinct waveforms of the x-ray beams for combining the projection image data to generate three-dimensional tomographic image data of the object.
    Type: Application
    Filed: September 22, 2006
    Publication date: September 23, 2010
    Inventors: Otto Z. Zhou, Jianping Lu, Jian Zhang, Guang Yang, Yueh Lee, Qi Qiu, Yuan Cheng
  • Patent number: 7801265
    Abstract: A system and method for creating a combined or mixed-energy image using both low- and high-energy CT data sets acquired using a dual-energy CT system. The low- and high-energy datasets are mixed using desired weighting factors to mimic a “single-energy” image. The low-energy dataset provides data with improved contrast enhancement, but with increased noise level. The high-energy dataset provides data with lower contrast enhancement, but with better noise properties. By combining the low- and high-energy datasets in accordance with the present method, the resulting mixed-energy images utilize the information of full dose of radiation used in the dual-energy scan. A plurality of weighting metrics can be selected, including patient size, dose partitioning, or image quality, to determine the desired weighting factors based on the weighting metrics. By selecting the proper weight factors, image noise can be reduced and/or the contrast to noise ratio can be increased in the mixed-energy image.
    Type: Grant
    Filed: November 24, 2008
    Date of Patent: September 21, 2010
    Assignee: Mayo Foundation for Medical Education and Research
    Inventors: Lifeng Yu, Cynthia H. McCollough
  • Patent number: 7778386
    Abstract: Disclosed are embodiments of methods for reconstructing x-ray projection data (e.g., one or more sinograms) acquired using a multi-source, inverse-geometry computed tomography (“IGCT”) scanner. One embodiment of a first method processes an IGCT sinogram by rebinning first in “z” and then in “xy,” with feathering applied during the “xy” rebinning. This produces an equivalent of a multi-axial 3rd generation sinogram, which may be further processed using a parallel derivative and/or Hilbert transform. A TOM-window (with feathering) technique and a combines backprojection technique may also be applied to produce a reconstructed volume. An embodiment of a second method processes an IGCT sinogram using a parallel derivative and/or redundancy weighting. The second method may also use signum weighting, TOM-windowing (with feathering), backprojection, and a Hilbert Inversion to produce another reconstructed volume.
    Type: Grant
    Filed: April 27, 2007
    Date of Patent: August 17, 2010
    Assignees: General Electric Company, The Board of Trustees of the Leland Stanford Junior University
    Inventors: Zhye Yin, Jed Douglas Pack, Bruno K. B. De Man, Norbert J. Pelc
  • Patent number: 7778454
    Abstract: At least one embodiment of the present application relates to a method and/or an apparatus for determining the concentration of a substance in a body material that is composed of two different material components in an unknown ratio. In an embodiment of the method, two computed tomography pictures from which two image data records are reconstructed are recorded in conjunction with two different spectral distributions of the x-radiation. The x-ray attenuation values for each voxel of the two image data records are decomposed into three material components. The decomposition is performed on the assumption that the x-ray attenuation value xM of the body material without the substance is composed of the x-ray attenuation values xM1, xM2 of the first and second material component in accordance with the following equation: xM=f*xM1+(1-f)*XM2, f being a volume fraction of the first material component in the body material.
    Type: Grant
    Filed: February 27, 2007
    Date of Patent: August 17, 2010
    Assignee: Siemens Aktiengesellschaft
    Inventors: Michael Grasruck, Bernhard Krauss
  • Publication number: 20100202583
    Abstract: A computed tomography (CT) system has a composite scanning mode in which the x-ray focal spot undergoes a circular or more general motion in the vertical plane facing an object to be reconstructed. The x-ray source also rotates along a circular trajectory along a gantry encircling the object. In this way, a series of composite scanning modes are implemented, including a composite-circling scanning (CCS) mode in which the x-ray focal spot undergoes two circular motions: while the x-ray focal spot is rotated on a plane facing a short object to be reconstructed, the x-ray source is also rotated around the object on the gantry plane. In contrast to the saddle curve cone-beam scanning, the CCS mode requires that the x-ray focal spot undergo a circular motion in a plane facing the short object to be reconstructed, while the x-ray source is rotated in the gantry plane.
    Type: Application
    Filed: January 8, 2010
    Publication date: August 12, 2010
    Inventors: Ge Wang, Hengyong Yu
  • Publication number: 20100195787
    Abstract: A method and a device are disclosed for generating a CT image with a high time resolution using a computed tomography scanner which has at least two recording systems which are operated at different X-ray energy spectra. In at least one embodiment of the process, CT images are firstly reconstructed in each case from a semi-rotation with the two recording systems, with irradiated lengths of the contrast agent-enriched structures and the soft tissue being calculated therefrom. Subsequently, a common X-ray energy is assumed and artificial measurement data records are calculated therefor, using the knowledge of the irradiated lengths for both recording systems at the same common X-ray energy. The artificial measurement data of respectively a quarter-rotation per recording system is then used to calculate the final CT image with a high time resolution. The method affords the use of dual-energy scans without losing the high time resolution available in dual-source systems.
    Type: Application
    Filed: January 28, 2010
    Publication date: August 5, 2010
    Inventors: Thomas Flohr, Rainer Raupach, Karl Stierstorfer
  • Publication number: 20100189213
    Abstract: A multi-emitter computed tomography scanner is disclosed, including a plurality of x-ray emitter/detector arrangement pairs arranged offset at an angle to one another. In at least one embodiment, the detector arrangements of the pairs are designed to be energy selective.
    Type: Application
    Filed: April 5, 2010
    Publication date: July 29, 2010
    Inventors: Herbert Bruder, Rainer Raupach, Karl Stierstorfer
  • Publication number: 20100183115
    Abstract: A Computer Tomography system for examining an object is disclosed. The system comprises a first X-ray tube, a second X-ray tube, a first X-ray detection unit and a second X-ray detection unit. Preferably, the first X-ray detection unit is adapted to acquire a first data set by detecting radiation emitted by the first X-ray tube after passing through the object under examination, and the second X-ray detection unit is adapted to acquire a second data set by detecting radiation emitted by the second X-ray tube after being scattered by the object under examination. The system has particular application to the field of baggage inspection.
    Type: Application
    Filed: August 7, 2007
    Publication date: July 22, 2010
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: Udo Van Stevendaal, Jens-Peter Schlomka
  • Publication number: 20100183117
    Abstract: There are provided an X-ray generating apparatus capable of switching X-ray beams of high energy and low energy to each other at high speed, and an X-ray CT apparatus capable of performing high-speed and high-quality multi-energy imaging by using the same. The X-ray generating apparatus is constructed by an X-ray tube 9 having two anodes 200a, 200b, a rotational anode 204 for radiating X-ray from an X-ray focal point by electron beams emitted from filaments of these cathodes, and two grid electrodes 202a and 202b for controlling emission of the electron beams, a tube voltage generator 9a and a tube voltage controller 9d1 for controlling an X-ray condition, a filament heater 9b and a tube current controller 9d2, a grid voltage generator 9c and a grid opening/closing controller 9d3, and a grid switching unit 9e. High energy X-ray and low energy X-ray are switched and emitted to an examinee every adjacent projection angles, thereby collecting projection data.
    Type: Application
    Filed: July 18, 2008
    Publication date: July 22, 2010
    Applicant: HITACHI MEDICAL CORPORATION
    Inventors: Yoshiaki Tsumuraya, Hironori Ueki, Keiji Koyanagi
  • Publication number: 20100172464
    Abstract: The disclosed CT scanner comprises at least one source of X-rays; a detector array comprising a plurality of detectors; and an X-ray filter mask arrangement disposed between the source of X-rays and detector array so as to modify the spectra of the X-rays transmitted from the source through the mask to at least some of the detectors so that the X-ray spectra detected by at least one set of detectors is different from the X-ray spectra detected by at least one other set of detectors.
    Type: Application
    Filed: January 7, 2009
    Publication date: July 8, 2010
    Applicant: Analogic Corporation
    Inventors: Julia Pavlovich, Aleksander Roshi, Ram Naidu, Sergey Simanovsky, Zhengrong Ying
  • Publication number: 20100166140
    Abstract: A computed tomography system (100) includes a first (1081) and a second source (108N) disposed at different z-axis locations at about a same angular position around an examination region (112) that alternately emit radiation beams (114) that traverse the examination region (112). The first source (1081) emits a first radiation beam (1141) having a first outer projection (204) and the second source (108N) emits a second radiation beam (114N) having a first outer projection (216). Both of the first outer projections (204, 216) traverse plane perpendicular to the axis of rotation, and the first outer projections (204, 216) define a width of a volume (400) within which the emitted radiation beams (114) are confined. A common detector (124) detects radiation from the x-ray beams (114) that traverses the volume (400) and generates data indicative thereof, and a reconstructor (132) reconstructs the data to generate an image of the volume (400).
    Type: Application
    Filed: July 24, 2007
    Publication date: July 1, 2010
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N. V.
    Inventor: Roand Proksa
  • Patent number: 7746974
    Abstract: A system includes emission of first electrons toward a first focal spot using an X-ray tube located at a first position, emission of first radiation from the first focal spot toward an object, acquisition of a first projection of the object based on the emitted first radiation using a computed tomography radiation detector, emission of second electrons toward a second focal spot using the X-ray tube located at the first position, emission of second radiation from the second focal spot toward the object, acquisition of a second projection of the object based on the emitted second radiation using the computed tomography radiation detector, and generation of an image of the object based on the first projection and the second projection.
    Type: Grant
    Filed: September 29, 2006
    Date of Patent: June 29, 2010
    Assignee: Siemens Medical Solutions USA, Inc.
    Inventor: Himanshu P. Shukla
  • Publication number: 20100150304
    Abstract: A plurality of radiation sources and a plurality of radiation detectors are integrated into a main imaging unit and a moving member is provided to the main imaging unit.
    Type: Application
    Filed: December 11, 2009
    Publication date: June 17, 2010
    Applicant: FUJIFILM Corporation
    Inventor: Takahiro Kawamura
  • Publication number: 20100135454
    Abstract: Certain embodiments provide staggered circular scans for CT imaging. In certain embodiments, a CT imaging system comprises a plurality of source-detector assemblies that are axially offset from one another and rotate about a rotation axis to provide staggered circular CT scanning.
    Type: Application
    Filed: September 15, 2009
    Publication date: June 3, 2010
    Inventor: Frederic Noo
  • Patent number: 7724868
    Abstract: Apparatus for monitoring in real time the movement of a plurality of substances in a mixture, such as oil water and air flowing through a pipe comprises an X-ray scanner arranged to make a plurality of scans of the mixture over a monitoring period to produce a plurality of scan data sets, and control means arranged to analyze the data sets to identify volumes of each of the substances and to measure their movement. By identifying volumes of each of the substances in each of a number of layers and for each of a number of scans, real time analysis and imaging of the substance can be achieved.
    Type: Grant
    Filed: September 16, 2008
    Date of Patent: May 25, 2010
    Assignee: Rapiscan Systems, Inc.
    Inventor: Edward James Morton
  • Publication number: 20100124310
    Abstract: A method for imaging an object in a computed tomography (CT) system with a plurality of sources comprising a first source and a second source, wherein the plurality of sources together with a detector array are mounted on a rotatable gantry, and wherein an intensity of the second source has unknown fluctuations is provided. Projection data is collected using the first source in a first gantry position. Projection data is collected using the second source in a second gantry position, wherein projection data from the first source in the first gantry position substantially overlaps projection data from the second source in the second gantry position. Data from the first source at the first gantry position is used to correct for source fluctuations of the second source at the second gantry position.
    Type: Application
    Filed: November 18, 2008
    Publication date: May 20, 2010
    Applicant: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Norbert J. Pelc, Jongduk Baek
  • Publication number: 20100124311
    Abstract: A tomographic image capturing apparatus includes a plurality of radiation sources movable along a predetermined path, for applying respective radiation to a subject at different angles and at different times while moving along the predetermined path, a dose adjuster for adjusting the radiation sources to equalize doses of the radiation emitted from the radiation sources, a radiation detector for detecting radiation transmitted through the subject while the radiation sources move along the predetermined path, and converting the detected radiation into respective items of radiographic image information, and a tomographic image generator for generating a tomographic image of the subject based on the items of radiographic image information converted from the radiation and detected by the radiation detector.
    Type: Application
    Filed: November 12, 2009
    Publication date: May 20, 2010
    Applicant: FUJIFILM Corporation
    Inventors: Jun Enomoto, Hirofumi Sawada, Sadato Akahori, Eiichi Kanagawa, Tomoyoshi Nishimura, Yasunori Ohta, Noriaki Ida
  • Patent number: 7711081
    Abstract: A method is disclosed for compiling computer tomographic representations using a CT system with at least two angularly offset ray sources. A first ray cone with a relatively larger fan angle and a second ray cone with a relatively smaller fan angle scan an object circularly or spirally. The first ray cone generates a first dataset A and the second ray cone generates a dataset B. The dataset B of the smaller ray cone is supplemented with other data at the edge to give an expanded dataset B+ for reconstruction of the CT representation. The expanded dataset B+ of the second, smaller ray cone and the dataset A of the first, larger ray cone is subjected to a convolution operation to give datasets B+? and A?. Finally, a back projection to reconstruct sectional images or volume data is respectively carried out from the convoluted datasets B+? and A?. The dataset B is supplemented with data of the dataset A and supplementary data are removed from the dataset B+? after the convolution but before the back projection.
    Type: Grant
    Filed: July 25, 2006
    Date of Patent: May 4, 2010
    Assignee: Siemens Aktiengesellschaft
    Inventors: Herbert Bruder, Thomas Flohr, Karl Schwarz, Karl Stierstorfer
  • Patent number: 7706499
    Abstract: Systems and methods are provided for acquiring and reconstructing projection data using a computed tomography (CT) system having stationary distributed X-ray sources and detector arrays. In one embodiment, a non-sequential activation of X-ray source locations on an annular source is employed to acquire projection data. In another embodiment, a distributed source is tilted relative to an axis of the scanner to acquire the projection data. In a further embodiment, a plurality of X-ray source locations on an annular source are activated such that the aggregated signals correspond to two or more sets of spatially interleaved helical scan data.
    Type: Grant
    Filed: March 20, 2007
    Date of Patent: April 27, 2010
    Assignee: General Electric Company
    Inventors: Jed Douglas Pack, Zhye Yin, Samit Kumar Basu, John Charles Hill, Peter Michael Edic
  • Patent number: 7700820
    Abstract: The present disclosure is generally directed to a process for controlling the quality of manufactured absorbent articles, the process including incorporating into an absorbent article at least a portion of a wetness sensing system that is configured to detect the presence of a substance, the wetness sensing system comprising at least one metallic conductive element; and passing the absorbent article in proximity to a foreign material sensor employing x-ray technology, the foreign material sensor adapted to detect the presence of foreign material to confirm whether foreign material has been incorporated into the article.
    Type: Grant
    Filed: November 30, 2006
    Date of Patent: April 20, 2010
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventors: Darold Dean Tippey, Perry Allen Bush, Timothy Patrick Clare
  • Publication number: 20100067647
    Abstract: A system includes emission of a first plurality of radiation beams from respective ones of a first plurality of locations along a first arc, acquisition of a first plurality of projection images of a target based on the first plurality of radiation beams, emission of a second plurality of radiation beams from respective ones of a second plurality of locations along a second arc, acquisition of a second plurality of projection images of the target based on the second plurality of radiation beams, and generation of a three-dimensional image of the target based on the first plurality of projection images and the second plurality of projection images, wherein a density of the first plurality of locations along the first arc is less than the density of the second plurality of locations along the second arc.
    Type: Application
    Filed: September 15, 2008
    Publication date: March 18, 2010
    Inventors: Ali Bani-Hashemi, Christopher Amies
  • Patent number: 7680241
    Abstract: A computed tomography reconstruction method includes concurrently emitting radiation from at least two x-ray sources (14), switching the output state of each of the at least two x-ray sources (14) within a plurality of respective cross scatter sampling intervals (50, 52, 54, 56) and detecting with a corresponding one of the sets of detectors (24) cross scatter radiation emitted by the other at least two x-ray sources (14), wherein the cross scatter sampling intervals are angularly spaced over a plurality of frames to allow the at least two x-ray sources (14) to concurrently emit radiation throughout at least one frame, deriving scatter correction data for each set of detectors (24) from corresponding cross scatter samples, scatter correcting the projection data with corresponding scatter correction data, and reconstructing the scatter corrected projection data to generate at least one image.
    Type: Grant
    Filed: June 13, 2007
    Date of Patent: March 16, 2010
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Bernd David, Michael Grass, Astrid Fatou Lewalter, Rainer Pietig
  • Patent number: 7672423
    Abstract: A short scan uses only data from about 180° gantry rotation instead of a full 360° turn. In the provided short scan cardiac CT, a periodical axial focal spot movement is performed during gantry rotation, wherein the acquired data used for image reconstruction results from a 180° rotation of the gantry. After the data acquisition, an approximate reconstruction is performed. In a preferred embodiment the focal spot moves on a short scan saddle trajectory.
    Type: Grant
    Filed: October 11, 2006
    Date of Patent: March 2, 2010
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: Roland Proksa
  • Patent number: 7672422
    Abstract: Systems and methods for the radiation scanning of objects, including large objects such as cargo containers, to identify contraband.
    Type: Grant
    Filed: May 6, 2008
    Date of Patent: March 2, 2010
    Assignee: Varian Medical Systems, Inc.
    Inventors: Edward J. Seppi, Marcel Marc, John Ford
  • Publication number: 20100034341
    Abstract: The aim of the invention is to produce an x-ray computed tomography arrangement in which there is no axial offset between the path of the focal spot and the x-ray detector arc.
    Type: Application
    Filed: February 12, 2008
    Publication date: February 11, 2010
    Applicant: FORSCHUNGSZENTRUM DRESDEN-ROSSENDORF E.V.
    Inventors: Uwe Hampel, Frank Fischer
  • Patent number: 7659521
    Abstract: A system for an intensity-modulated proton therapy of a predetermined target volume within an object includes a proton source to generate a proton beam, a number of proton beam forming units and a beam nozzle having an outlet for the proton beam to penetrate the predetermined target volume of the object, thereby defining a cross sectional scanning exit area. The system includes further a beam bending magnet disposed upstream of the nozzle, and an x-ray tube and an x-ray imager. The x-ray tube is associated with an irradiation channel within the beam bending magnet, wherein the irradiation channel is oriented along the prolongation of the nominal proton beam direction thereby delivering the x-ray beam along the proton beam direction.
    Type: Grant
    Filed: April 14, 2005
    Date of Patent: February 9, 2010
    Assignee: Paul Scherrer Institute
    Inventor: Eros Pedroni
  • Patent number: 7656998
    Abstract: A unified quality assurance technique to verify alignment of a radiation treatment delivery system. In one embodiment, a radiation treatment source is instructed to move to a preset source position. An image of the radiation treatment source at its actual source position is generated and compared against a reference image to determine whether the radiation treatment source correctly achieved the preset source position. In one embodiment, a positioning system is instructed to move a target detector to a preset target position. An image of the target detector at its actual target position is generated and compared against a reference target image to determine whether the positioning system correctly achieved the preset target position.
    Type: Grant
    Filed: November 14, 2005
    Date of Patent: February 2, 2010
    Assignee: Accuray Incorporated
    Inventors: William T. Main, Eric Earnst, Gopinath Kuduvalli
  • Patent number: 7656992
    Abstract: A method and a CT system are disclosed for determining movement and rest phases of a partial object that moves at times in an examination object during a CT examination. In at least one embodiment, at least two different radiation sources are used for the comparative measurement, and a first radiation source emits a first fan beam at a specific rotation angle at a first instant, the absorption of said beam being measured in beamwise fashion, a second radiation source emits a second fan beam, at the same rotation angle at a second, later instant, the absorption of the beam likewise being measured in beamwise fashion, and the relative movement or relative rest of the partial object between the first and second instants is deduced by comparing deviating absorption values of a multiplicity of spatially equivalent and equidirectional fan beams proceeding from the same angular position of the radiation sources.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: February 2, 2010
    Assignee: Siemens Aktiengesellschaft
    Inventors: Herbert Bruder, Thomas Flohr
  • Patent number: 7657304
    Abstract: A radiotherapy clinical treatment machine is described having a rotatable gantry and an imaging device with articulating robotic arms to provide variable positioning and clearance for radiation treatment applications. According to one aspect of the invention, a first and a second robotic arms are pivotally coupled to the rotatable gantry, allowing the robotic arms to maneuver independently from the rotatable gantry.
    Type: Grant
    Filed: October 5, 2002
    Date of Patent: February 2, 2010
    Assignee: Varian Medical Systems, Inc.
    Inventors: Stan Mansfield, Robert Kopels, Ulrich Martin Graf
  • Publication number: 20100020920
    Abstract: In an x-ray system and a method for tomosynthetic scanning of a subject, x-ray radiation is emitted from two x-ray sources that are panned relative to the subject during a tomosynthetic scan. The two x-ray sources each emit an x-ray beam, the respective x-ray beams being parallel to each other with regard to their beam directions proceeding toward the subject. X-rays from the two parallel beams attenuated by the subject are detected by a two-dimensional x-ray detector, that is substantially stationary during the tomosynthetic scan.
    Type: Application
    Filed: September 26, 2007
    Publication date: January 28, 2010
    Inventor: Thomas Mertelmeier
  • Patent number: 7649973
    Abstract: An imaging system includes at least two x-ray sources, an x-ray detector assembly and an attenuation filter. The at least two x-ray sources are displaced along a z-axis and configured to alternately emit x-ray beams. The x-ray detector assembly is configured to detect the x-ray beams. The attenuation filter is mounted proximate the at least two x-ray sources and is configured to provide different amounts of x-ray attenuation to the x-ray beams along the z-axis.
    Type: Grant
    Filed: October 2, 2008
    Date of Patent: January 19, 2010
    Assignee: General Electric Company
    Inventors: Baojun Li, Thomas Louis Toth, Jiang Hsieh
  • Patent number: 7646843
    Abstract: A method is disclosed for producing projective and tomographic phase contrast images of an examination object, preferably a patient, with the aid of an X-ray system, and a corresponding X-ray system for carrying out this method. In at least one embodiment of the method, X-ray optical grating sets tuned to different energy ranges are used to determine energy-dependent phase shifts upon penetration of an examination object, a difference value is formed from these energy-dependent phase shifts, and tomographic or projective images are produced therefrom.
    Type: Grant
    Filed: January 31, 2007
    Date of Patent: January 12, 2010
    Assignee: Siemens Aktiengesellschaft
    Inventors: Stefan Popescu, Björn Heismann, Eckhard Hempel
  • Publication number: 20100002829
    Abstract: Apparatus for CT cone beam scanning, comprising: a table for holding a subject; a gantry; a first detector array, having a given number of rows of detector elements spaced along an rotation axis of the gantry, mounted on the gantry; a first plurality of x-ray sources mounted on the gantry for rotation about the patient table on a rotation axis, the number of rows being at least twice the number of sources; and a controller that acquires data responsive to radiation from the sources from the detector array attenuated by at least part of the common volume of the subject irradiated by the plurality of radiation sources.
    Type: Application
    Filed: April 10, 2007
    Publication date: January 7, 2010
    Inventor: Ehud Dafni