Patents Examined by Pamela R. Hobden
  • Patent number: 6381300
    Abstract: A mask of certain type has a transparent base and a transparent film formed on the transparent base. The transparent film has at least one mask member formed in a predetermined mask pattern and having a relatively low exposure beam transparency. The mask member sometimes has a placement error from a designed placement. This is mainly because an in-plane stress distribution of the transparent film is nonuniformity. The transparent film is partially decreased in thickness to unity the in-plane stress distribution.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: April 30, 2002
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Mizunori Ezaki
  • Patent number: 6377661
    Abstract: A collimator 100 for use in a radiation imaging system 10, and a method for making such collimators, are provided, wherein the collimator 100 is capable of collimating radiation in two orthogonal planes. The collimator in one embodiment includes a block 101 of radiation absorbing material having a plurality of focally aligned channels 102 extending therethrough; in a second embodiment, the collimator includes first and second collimation 204, 212 sections having a respective first plurality of focally aligned plate sets 201 and a respective second plurality of focally aligned plate sets 203 disposed orthogonally to the first plurality of plate sets. The method for making the collimator includes generating a CAD drawing, generating from the CAD drawing one or more stereo-lithographic files, and using the stereo-lithographic files to control an electro-deposition machining machine which creates the channels in the block.
    Type: Grant
    Filed: November 3, 2000
    Date of Patent: April 23, 2002
    Assignee: General Electric Company
    Inventors: Shankar Visvanathan Guru, Peter Michael Edic, Reinhold Franz Wirth
  • Patent number: 6370217
    Abstract: The present invention, in one form is an imaging system for generating images of an entire object. In one embodiment, a physiological cycle unit is used to determine the cycle of the moving object. By altering the rotational speed of an x-ray source as a function of the object cycle, segments of projection data are collected for each selected phase of the object during each rotation. After completing a plurality of rotations, the segments of projection data are combined and a cross-sectional image of the selected phase of the object is generated. As a result, minimizing motion artifacts.
    Type: Grant
    Filed: May 7, 1999
    Date of Patent: April 9, 2002
    Assignee: General Electric Company
    Inventors: Hui Hu, Jiang Hsieh, Stanley H. Fox, Kishore C. Acharya, Hui David He, Yi Sun
  • Patent number: 6370227
    Abstract: A collimator 100 for use in a radiation imaging system 10, and a method for making such collimators, are provided, wherein the collimator 100 is capable of collimating radiation in two orthogonal planes. The collimator in one embodiment includes a block 101 of radiation absorbing material having a plurality of focally aligned channels 102 extending therethrough; in a second embodiment, the collimator includes first and second collimation 204, 212 sections having a respective first plurality of focally aligned plate sets 201 and a respective second plurality of focally aligned plate sets 203 disposed orthogonally to the first plurality of plate sets. The method for making the collimator includes generating a CAD drawing, generating from the CAD drawing one or more stereo-lithographic files, and using the stereo-lithographic files to control an electro-deposition machining machine which creates the channels in the block.
    Type: Grant
    Filed: November 6, 2000
    Date of Patent: April 9, 2002
    Assignee: General Electric Company
    Inventors: Shankar Visvanathan Guru, Peter Michael Edic, Reinhold Franz Wirth
  • Patent number: 6366636
    Abstract: An X-ray sensor signal processor including capacitors 114 for removing DC components (dark currents) from output signals of semiconductor sensors 21 to 2n detecting pulse-like X-rays passed through an object, and integrators (each of which is constituted by a combination of an operational amplifier 115, a resistor 116 and a capacitor 117) for integrating the output signals of the X-ray sensors after removal of the DC components by the capacitors 114. By this, a value proportional to the average number of photons in X-rays can be obtained even in the case where a small number of incident photons are given, and an X-ray CT system using the X-ray sensor signal processor.
    Type: Grant
    Filed: March 3, 2000
    Date of Patent: April 2, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Hiroshi Kamimura, Shigeru Izumi, Hiroshi Kitaguchi, Atsushi Yamagoshi, Katsutoshi Satoh
  • Patent number: 6366639
    Abstract: In an X-ray exposure method of this invention, an X-ray mask unit in which a patterned X-ray absorber is formed on a membrane is supported. This patterned X-ray absorber contains one of an element having a density/atomic weight of 0.085 [g/cm3] or more and an L-shell absorption edge at a wavelength of 0.75 to 1.6 nm and an element having a density/atomic weight of 0.04 [g/cm3] or more and an M-shell absorption edge at a wavelength of 0.75 to 1.6 nm. Synchrotron radiation having maximum light intensity at a wavelength of 0.6 to 1 nm is applied onto the X-ray mask unit. This improves the exposure accuracy in X-ray exposure.
    Type: Grant
    Filed: June 22, 1999
    Date of Patent: April 2, 2002
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Mizunori Ezaki, Kenichi Murooka
  • Patent number: 6366640
    Abstract: There is disclosed an X-ray mask comprising, on a support substrate 11a, an X-ray transmission film 12 for transmitting X-rays and an X-ray absorber pattern 13a formed on the X-ray transmission film 12 for absorbing the X-rays. The X-ray absorber pattern 13a is formed of a material which contains tantalum, boron, nitrogen and/or oxygen.
    Type: Grant
    Filed: November 12, 1999
    Date of Patent: April 2, 2002
    Assignee: Hoya Corporation
    Inventor: Tsutomu Shoki
  • Patent number: 6364527
    Abstract: A rotating bulb x-ray radiator has an x-ray tube accepted in a housing filled with a coolant, the x-ray tube being torsionally connected to the housing and being mounted so as to be rotatable together therewith. The housing is at least partially formed of a material that is highly attenuating for x-rays.
    Type: Grant
    Filed: November 10, 1999
    Date of Patent: April 2, 2002
    Assignee: Siemens Aktiengesellschaft
    Inventor: Wolfgang Kutschera
  • Patent number: 6365900
    Abstract: A detection head and collimator for a gamma camera. The detection head includes several elementary detectors with semiconductors adjacent to each other to form a detection plane. The collimator is placed in front of the detection plane and includes a number of ducts laid out in a repetition pattern. The shape of the elementary detectors and the repetition pattern are rectangular in the detection plane.
    Type: Grant
    Filed: June 30, 1999
    Date of Patent: April 2, 2002
    Assignee: Commissariat a l'Energie Atomique
    Inventors: Corinne Mestais, Raymond Campagnolo, Robert Allemand
  • Patent number: 6359958
    Abstract: In one embodiment, the present invention is a method for positioning an x-ray beam on a multi-slice detector array of an imaging system in which the detector array has rows of detector elements and is configured to detect x-rays in slices along a z-axis. The method includes steps of comparing data signals representative of x-ray intensity received from different rows of detector elements in first and second element subsets where the first and second subsets are located at opposite ends of the detector array and positioning the x-ray beam in accordance with a result of the comparisons.
    Type: Grant
    Filed: December 21, 2000
    Date of Patent: March 19, 2002
    Assignee: GE Medical Systems Global Technology Company, LLC
    Inventor: Thomas L. Toth
  • Patent number: 6359955
    Abstract: In order to allow slice thicknesses to be set for a twin asymmetric scan in which a scan is performed with a first slice thickness in a first detector row of a multi detector and with a second slice thickness different than the first slice thickness in a second detector row, first, a position of an X-ray beam is moved and a scan is performed while keeping the width of the X-ray beam fixed at twice the first slice thickness to move the position of the X-ray beam to a position at which count values for the first and second detector rows match (ST2-ST5). The count value for the detector row at this time is stored (ST6). Next, the position of the X-ray beam is moved and a scan is performed while keeping the width of the X-ray beam fixed at the sum of the first and second slice thicknesses to move the position of the X-ray beam to a position at which the count value for the first detector row matches the stored count value (ST7-ST9).
    Type: Grant
    Filed: April 5, 2000
    Date of Patent: March 19, 2002
    Assignee: GE Yokogawa Medical Systems, Limited
    Inventor: Masatake Nukui
  • Patent number: 6351519
    Abstract: A method is proposed for compensating for the dark current of an electronic sensor having a plurality of pixels with an individual dark-current response, radiation for producing an image signal (BS) being directed from a beam source (3) onto a detector arrangement (4) containing the sensor, and a recording being taken with different clock-out rate (v) (integration time) by reading the detector signal (S) present in the pixels of the sensor, in which, before the beginning or after the end of the recording with radiation, the sensor is read out without radiation with at least two different clock-out rates (v1, v2) and at least two dark-current signals (DC1, DC2) are thereby picked up for each pixel, in which the dark-current signals (DC1, DC2) that have been read out are then used to calculate a dark-current value (DV) of individual pixels of the sensor as a function of the clock-out rate (v), and in which a correction is then made, using the dark-current value associated with each pixel, to the detector signal
    Type: Grant
    Filed: February 11, 2000
    Date of Patent: February 26, 2002
    Assignee: Sirona Dental Systems GmbH
    Inventors: Roland Bonk, Uwe Zeller
  • Patent number: 6346706
    Abstract: An apparatus for identifying the location of a photon source within an imaging area and which generates photons having energies within a known energy range, the apparatus including two oppositely facing cameras disposed on opposite sides of the imaging area, each camera including a first detector unit which causes scattering when a photon enters the unit and generates signals indicative of the scattering event location, energy and time and a second detector unit which absorbs the scattered photon and generates signals indicative of the absorption event energy and time, the generated signals are then mathematically combined to determine the location of the source. Also a Compton camera including a first detector unit which is anatomically configured to generally mirror the external surface of a portion of a patient including an object to be imaged, a second detector unit positioned outside an imaging area to receive scattered photons from the first unit.
    Type: Grant
    Filed: June 24, 1999
    Date of Patent: February 12, 2002
    Assignee: The Regents of the University of Michigan
    Inventors: William L. Rogers, Neal H. Clinthorne
  • Patent number: 6341893
    Abstract: A radiographic stand with a radiation image receiving portion includes a lying stand having a top plate on which a subject lies down, a radiation image receiving portion located below the top plate, and a moving mechanism for making the radiation image receiving portion movable in the widthwise direction or the lengthwise direction of the top plate. The moving mechanism also makes the radiation image receiving portion erectable in a vertical direction.
    Type: Grant
    Filed: July 20, 1999
    Date of Patent: January 29, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazuhiro Matsumoto, Junichi Yamayoshi, Osamu Tsujii, Tsukasa Sako
  • Patent number: 6342706
    Abstract: A retroreflective detector comprises a detection unit which houses two transmitting elements and two receiving elements, in which a transmitting element and a receiving element form a pair and two such pairs are disposed in a matrix arrangement. Every row and column of the matrix includes one or more transmitting elements.
    Type: Grant
    Filed: April 17, 2000
    Date of Patent: January 29, 2002
    Assignee: Optex Co., Ltd.
    Inventor: Kenji Takeda
  • Patent number: 6341152
    Abstract: There is disclosed an X-ray computerized tomography apparatus capable of accurately and promptly carrying out a navigation of an operation, by real-time reconstructing and displaying an image of a slice in which an object such as an insertion object inside a subject exists.
    Type: Grant
    Filed: September 10, 1999
    Date of Patent: January 22, 2002
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Naoki Sugihara
  • Patent number: 6335959
    Abstract: An apparatus and method for determining the phase volume fractions for a multiphase oil well effluent is disclosed. The apparatus measures multiple energy gamma ray attenuations through the effluent mixture, and the method determines the phase volume fractions from these measurements when the mixture is under inhomogeneous flow conditions. The apparatus includes a pipe section with a Venturi through which the mixture flows. A source of radiation transmits rays at two or more energy levels through the mixture. A solid state detector measures the transmitted attenuation count rates. A low absorption window of a truncated cone shape is preferably incorporated in lieu of the pipe wall in the area of the detector. The method comprises measuring ray attenuation, in the two-energy example, at one high energy emission line, to differentiate between the gas and liquid components, and at a relatively lower energy emission line, to differentiate between the oil and water phases within the liquid component.
    Type: Grant
    Filed: October 4, 2000
    Date of Patent: January 1, 2002
    Assignee: Daniel Industries, Inc.
    Inventors: Frank Joseph Lynch, Gary John Miller
  • Patent number: 6332016
    Abstract: In order to provide a photoelectric conversion device of high S/N ratio or high resolution in which the outputs of sensor cells except any defective sensor cell can be made to have normal values, thereby to obtain data of higher precision, any switching element that does not operate normally is removed in a photoelectric conversion device wherein a plurality of sensor cells, in each of which a photoelectric element and a switching element are connected, are arrayed in two dimensions on a substrate.
    Type: Grant
    Filed: July 28, 1999
    Date of Patent: December 18, 2001
    Assignee: Canon Kabushiki Kaisha
    Inventor: Isao Kobayashi
  • Patent number: 6329658
    Abstract: A system for processing signals from a radiation detector with semiconductors. A plurality of elementary detectors are placed side-by-side along a detection surface or a detection volume in which radiation referred to as incident radiation is capable of giving up its energy in at least one interaction. The device includes the supplying in response to each incident ray, an amount of energy corresponding to the sum of the energies given up during each interaction induced by the incident radiation. This device may be used in medical imaging.
    Type: Grant
    Filed: September 23, 1999
    Date of Patent: December 11, 2001
    Assignee: Commissariat A l'Energie Atomique
    Inventors: Corinne Mestais, Alain Chapuis, Olivier Monnet, François Lebrun
  • Patent number: 6324248
    Abstract: A cross-sectional distribution along a cutting plane is derived from an object data set of data values. The cross-sectional distribution comprises density values. The density values are calculated from data values of the object data set in positions outside the cutting plane. The object data set represents an object to be examined and is, for example, acquired by way of volumetric computed tomography or magnetic resonance imaging. For example, the density values of the cross-sectional distribution are calculated by local (slab) MIP or mIP or by interpolation.
    Type: Grant
    Filed: October 6, 2000
    Date of Patent: November 27, 2001
    Assignee: U.S. Philips Corporation
    Inventors: Jan Timmer, Jantje Edith Wilting