Patents by Inventor Taiga Goto

Taiga Goto 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: 10410343
    Abstract: A reconstruction image is generated with a small number of updates, with the use of an iterative approximation method. A specified tomographic image of a subject is received, and a process is performed two or more times, where an update process is performed according to the iterative approximation method, using the tomographic image as an initial image and an update image is obtained. Then, an update vector corresponding to a difference between thus generated update images of the update process performed twice is multiplied by predetermined coefficients, so as to generate an estimated update vector. Using this vector, an update image is generated. Then, this update image is used as a new initial image, and a process is repeated where the update process is performed according to the iterative approximation method and an update image is obtained, thereby generating a tomographic image of the subject.
    Type: Grant
    Filed: June 22, 2016
    Date of Patent: September 10, 2019
    Assignee: HITACHI, LTD.
    Inventors: Hisashi Takahashi, Taiga Goto, Koichi Hirokawa
  • Patent number: 10401322
    Abstract: A separation unit is a configuration that is arranged vertically, and thus bubbles generating from the electrode will not negatively influence the contact location between the transfer membrane and separation unit. An anode (32) is arranged at a position separated by a certain distance in the conveying direction (X) of the transfer membrane (1) from the dispensing part (50a) of an electrophoresis gel chip (50). An insulating electrode cover (35) for setting free bubbles generating from the anode (32) is arranged at an upper part of the anode (32).
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: September 3, 2019
    Assignee: Merck LTD.
    Inventors: Taiga Tominaga, Hideki Kinoshita, Shinichi Goto, Mieko Hirabayashi, Kouhei Kageyama, Takateru Matsunaga, Kimihiko Yabe
  • Patent number: 10398404
    Abstract: In order to provide a data processing device and the like, capable of performing highly accurate reference correction even in a case where an object protrudes in reference channels in most of the measurement views, an image processing device (data processing device) of an X-ray CT apparatus calculates a unit air calibration reference value which is a value per unit tube current of an air calibration reference value which is reference data measured during air calibration, calculates a reference value (estimated reference value) corresponding to an X-ray condition in the main scanning on the basis of an output tube current value in the main scanning and a unit air calibration reference value, and corrects normalized reference data obtained by normalizing a measured reference value in the main scanning with the estimated reference value, to be included in an allowable error range, so as to remove the influence of protrusion.
    Type: Grant
    Filed: October 7, 2015
    Date of Patent: September 3, 2019
    Assignee: HITACHI, LTD.
    Inventors: Taiga Goto, Hisashi Takahashi, Koichi Hirokawa
  • Patent number: 10398392
    Abstract: In order to provide an X-ray CT apparatus which can reconstruct a tomographic image with less unevenness in image quality at a high speed on the basis of projection data which is obtained by irradiating an object with X-rays, the X-ray CT apparatus of the invention includes an inverse projection phase width setting unit that sets an inverse projection phase width which is an angular width of projection data used for reconstruction, for each tomographic image, and a view weight calculation unit that calculates a view weight which is a weight coefficient multiplied by projection data within the inverse projection phase width and is a function of a view angle, for each position of a pixel of a tomographic image.
    Type: Grant
    Filed: February 1, 2016
    Date of Patent: September 3, 2019
    Assignee: HITACHI, LTD.
    Inventors: Tsuyoshi Suzuki, Fuyuhiko Teramoto, Yuko Aoki, Taiga Goto
  • Patent number: 10395396
    Abstract: In order to reduce a metal artifact using a short process, without causing image quality deterioration, when a subject containing metal is imaged in an X-ray CT apparatus, the invention is such that a high frequency component is extracted utilizing the fact that a high frequency component is a structure in error projection data, which are a difference between primary corrected projection data wherein at least one portion of an artifact component caused by metal has been removed and photographed projection data acquired by imaging. The high frequency component, extracted while carrying out weighting in order to suppress the metal artifact, is restored to the primary corrected projection data, after which an image is reconstructed. Also, metal projection data used when compiling the primary corrected projection data are calculated from a value that is a CT value corresponding to soft tissue subtracted from a CT value of a metal region.
    Type: Grant
    Filed: February 29, 2016
    Date of Patent: August 27, 2019
    Assignee: HITACHI, LTD.
    Inventors: Taiga Goto, Hisashi Takahashi, Hideaki Fujii
  • Patent number: 10342500
    Abstract: In a case where helical scanning, etc., is performed in an X-ray CT apparatus, upsampled projection data that more approximates to an observed value is obtained. There is provided an X-ray CT apparatus that improves spatial resolution of an overall effective field of view without reducing rotation speed, in an FFS method of acquiring projection data through moving of an X-ray focus position to a plurality of positions. The X-ray CT apparatus: converts projection data acquired through helical scanning into projection data of normal scanning performed by one rotation; generates a virtual-counter-data space in which virtual counter data are acquired on substantially coincident X-ray transmission path in the converted projection data; performs upsampling in a view direction; and similarly upsamples FFS projection data in the view direction for focus-shifted projection data obtained by performing the helical scanning while causing the X-ray focus position to shift (virtual counter data space generation).
    Type: Grant
    Filed: November 13, 2015
    Date of Patent: July 9, 2019
    Assignee: HITACHI, LTD.
    Inventors: Hideaki Fujii, Taiga Goto, Tetsuo Nakazawa
  • Publication number: 20190180482
    Abstract: In order to determine noise intensity more accurately by a projection data division method using data after fan-parallel conversion, a plurality of projection data obtained by irradiating a scan object with radiations are received and subjected to prescribed data conversion; data after the conversion is divided into two or more sets; a reconstructed image is generated for each set of data; and the generated reconstructed image for each of the sets is subtracted to generate a difference image. An index indicating pixel value variation for at least one prescribed region on the difference image is calculated, the value of the index is corrected by a previously calculated correction value, and the corrected index value is regarded as noise intensity of the region.
    Type: Application
    Filed: June 16, 2017
    Publication date: June 13, 2019
    Applicant: Hitachi, Ltd.
    Inventors: Hisashi TAKAHASHI, Taiga GOTO, Koichi HIROKAWA
  • Patent number: 10213177
    Abstract: An X-ray CT apparatus includes an extraction unit that acquires air data measured using the X-ray CT apparatus and the measurement data obtained by scanning the object, that extracts sensitivity variation data which is a sensitivity variation component of a detection element from the air data, and that extracts blank data from which the sensitivity variation component is removed, and a projection data generation unit that removes the sensitivity variation component and noise which are included in the measurement data, based on the sensitivity variation data, and that uses the blank data so as to perform a correction process of the measurement data from which the sensitivity variation component and the noise are removed.
    Type: Grant
    Filed: July 23, 2015
    Date of Patent: February 26, 2019
    Assignee: HITACHI, LTD.
    Inventors: Hisashi Takahashi, Taiga Goto, Koichi Hirokawa
  • Publication number: 20180350113
    Abstract: In order to reduce a metal artifact using a short process, without causing image quality deterioration, when a subject containing metal is imaged in an X-ray CT apparatus, the invention is such that a high frequency component is extracted utilizing the fact that a high frequency component is a structure in error projection data, which are a difference between primary corrected projection data wherein at least one portion of an artifact component caused by metal has been removed and photographed projection data acquired by imaging. The high frequency component, extracted while carrying out weighting in order to suppress the metal artifact, is restored to the primary corrected projection data, after which an image is reconstructed. Also, metal projection data used when compiling the primary corrected projection data are calculated from a value that is a CT value corresponding to soft tissue subtracted from a CT value of a metal region.
    Type: Application
    Filed: February 29, 2016
    Publication date: December 6, 2018
    Inventors: Taiga GOTO, Hisashi TAKAHASHI, Hideaki FUJII
  • Publication number: 20180165807
    Abstract: A reconstruction image is generated with a small number of updates, with the use of an iterative approximation method. A specified tomographic image of a subject is received, and a process is performed two or more times, where an update process is performed according to the iterative approximation method, using the tomographic image as an initial image and an update image is obtained. Then, an update vector corresponding to a difference between thus generated update images of the update process performed twice is multiplied by predetermined coefficients, so as to generate an estimated update vector. Using this vector, an update image is generated. Then, this update image is used as a new initial image, and a process is repeated where the update process is performed according to the iterative approximation method and an update image is obtained, thereby generating a tomographic image of the subject.
    Type: Application
    Filed: June 22, 2016
    Publication date: June 14, 2018
    Applicant: HITACHI, LTD.
    Inventors: Hisashi TAKAHASHI, Taiga GOTO, Koichi HIROKAWA
  • Patent number: 9980694
    Abstract: In order to provide a technique capable of restoring measured data from projection data with high accuracy and removing system noise included in the measured data, a signal processing device obtains measured data x including signal values of 0 or less by processing an output signal from a data acquisition system, and performs a conversion process on the measured data x by using a predefined function including a logarithmic function so as to generate projection data (logarithmically converted data z), in which the predefined function is a function of which an inverse function is present for values of a predetermined negative number s or more, and the measured data x including signal values of 0 or less within a predetermined range is restored from the projection data by applying the inverse function to the projection data.
    Type: Grant
    Filed: January 23, 2015
    Date of Patent: May 29, 2018
    Assignee: HITACHI, LTD.
    Inventors: Hisashi Takahashi, Taiga Goto, Koichi Hirokawa
  • Publication number: 20180110480
    Abstract: In order to provide an X-ray CT apparatus which can reconstruct a tomographic image with less unevenness in image quality at a high speed on the basis of projection data which is obtained by irradiating an object with X-rays, the X-ray CT apparatus of the invention includes an inverse projection phase width setting unit that sets an inverse projection phase width which is an angular width of projection data used for reconstruction, for each tomographic image, and a view weight calculation unit that calculates a view weight which is a weight coefficient multiplied by projection data within the inverse projection phase width and is a function of a view angle, for each position of a pixel of a tomographic image.
    Type: Application
    Filed: February 1, 2016
    Publication date: April 26, 2018
    Inventors: Tsuyoshi SUZUKI, Fuyuhiko TERAMOTO, Yuko AOKI, Taiga GOTO
  • Patent number: 9895128
    Abstract: In order to provide a technique for reducing system noise from an output signal value (measurement data), an X-ray CT apparatus includes an X-ray generation unit that irradiates X-rays to an object, an X-ray detector that detects the X-rays transmitted through the object, a correction processing unit that corrects an output signal from the X-ray detector, and a reconstruction calculating unit that reconstructs an image on the basis of an output from the correction processing unit, in which the X-ray detector includes arranged detection elements, and in which the correction processing unit maintains an average value of output signal values of a plurality of predetermined detection elements centering on a focused detection element among the detection elements, and also reduces a variance of the output signal values of the plurality of predetermined detection elements centering on the focused detection element.
    Type: Grant
    Filed: August 6, 2014
    Date of Patent: February 20, 2018
    Assignee: HITACHI, LTD.
    Inventors: Hisashi Takahashi, Taiga Goto, Koichi Hirokawa
  • Publication number: 20170273657
    Abstract: In order to provide a data processing device and the like, capable of performing highly accurate reference correction even in a case where an object protrudes in reference channels in most of the measurement views, an image processing device (data processing device) of an X-ray CT apparatus calculates a unit air calibration reference value which is a value per unit tube current of an air calibration reference value which is reference data measured during air calibration, calculates a reference value (estimated reference value) corresponding to an X-ray condition in the main scanning on the basis of an output tube current value in the main scanning and a unit air calibration reference value, and corrects normalized reference data obtained by normalizing a measured reference value in the main scanning with the estimated reference value, to be included in an allowable error range, so as to remove the influence of protrusion.
    Type: Application
    Filed: October 7, 2015
    Publication date: September 28, 2017
    Inventors: Taiga GOTO, Hisashi TAKAHASHI, Koichi HIROKAWA
  • Publication number: 20170231581
    Abstract: A CT image reconstructing method, a CT image reconstructing device and a CT system are provided for reducing motion artifacts in CT images in case of motion of an object. The CT image reconstructing method reconstructs CT images from projection data obtained by X-ray scanning, including a moving object position detecting step for detecting a position of a moving object in a CT image; a partial angle selecting step for selecting a view point and an angle range according to said position of the moving object and selecting data of partial angles in said projection data according to said view point and said angle range; a partial angle constraint step for generating partial angles constraint conditions according to the data of said partial angles; and an iterative reconstruction step for generating CT images by iterative reconstruction, thereby improving temporal resolution of CT images of moving objects and reducing motion artifacts.
    Type: Application
    Filed: June 15, 2015
    Publication date: August 17, 2017
    Inventors: Xingdong SHENG, Yingjie HAN, Taiga GOTO, Keisuke YAMAKAWA
  • Publication number: 20170231589
    Abstract: In a case where helical scanning, etc., is performed in an X-ray CT apparatus, upsampled projection data that more approximates to an observed value is obtained. There is provided an X-ray CT apparatus that improves spatial resolution of an overall effective field of view without reducing rotation speed, in an FFS method of acquiring projection data through moving of an X-ray focus position to a plurality of positions. The X-ray CT apparatus: converts projection data acquired through helical scanning into projection data of normal scanning performed by one rotation; generates a virtual-counter-data space in which virtual counter data are acquired on substantially coincident X-ray transmission path in the converted projection data; performs upsampling in a view direction; and similarly upsamples FFS projection data in the view direction for focus-shifted projection data obtained by performing the helical scanning while causing the X-ray focus position to shift (virtual counter data space generation).
    Type: Application
    Filed: November 13, 2015
    Publication date: August 17, 2017
    Inventors: Hideaki FUJII, Taiga GOTO, Tetsuo NAKAZAWA
  • Publication number: 20170202532
    Abstract: In order to provide a data processing method and the like capable of suppressing high-frequency errors such as moiré using data uniformly by presuming that adjacent pixels and beams overlap and performing calculation in a back projection process or a forward projection process for reconstructing images, the image processing device 122 sets a pixel size wider than a pixel interval, performs the back projection process or the forward projection process for calculating an interpolation value to be assigned to the pixels or the beams using a size-dependent weight (pixel window) according to an overlap amount of the adjacent pixels, sets a beam size wider than a beam interval, and then performs the back projection process or the forward projection process for calculating an interpolation value to be assigned to the pixels or the beams using a size-dependent weight (beam window) according to an overlap amount of the adjacent beams.
    Type: Application
    Filed: July 10, 2015
    Publication date: July 20, 2017
    Applicant: HITACHI, LTD.
    Inventors: Taiga GOTO, Hisashi TAKAHASHI, Koichi HIROKAWA
  • Publication number: 20170135664
    Abstract: An X-ray CT apparatus includes an extraction unit that acquires air data measured using the X-ray CT apparatus and the measurement data obtained by scanning the object, that extracts sensitivity variation data which is a sensitivity variation component of a detection element from the air data, and that extracts blank data from which the sensitivity variation component is removed, and a projection data generation unit that removes the sensitivity variation component and noise which are included in the measurement data, based on the sensitivity variation data, and that uses the blank data so as to perform a correction process of the measurement data from which the sensitivity variation component and the noise are removed.
    Type: Application
    Filed: July 23, 2015
    Publication date: May 18, 2017
    Applicant: HITACHI, LTD.
    Inventors: Hisashi TAKAHASHI, Taiga GOTO, Koichi HIROKAWA
  • Publication number: 20170000428
    Abstract: In order to provide an X-ray CT apparatus and a contrast enhanced scanning method that can obtain an image having a favorable contrast effect without re-injecting contrast medium even when a scanning position overtakes a position of the contrast medium during scanning using the contrast medium, the X-ray CT apparatus determines whether or not a current scanning position overtakes the contrast medium during main scanning, resets a scanning condition when overtaking the contrast medium, executes re-scanning under the reset scanning condition, and determines overtaking of the contrast medium based on differential data between measurement data acquired by non-contrast enhanced scanning to be performed before the main scanning and measurement data to be acquired by the main scanning. Hence, no image needs to be reconstructed during scanning to check whether or not there is a contrast effect, and the overtaking determination is performed at a high speed, which can swiftly shift to re-scanning.
    Type: Application
    Filed: January 8, 2015
    Publication date: January 5, 2017
    Applicant: HITACHI, LTD.
    Inventor: Taiga GOTO
  • Publication number: 20170000442
    Abstract: In order to provide a technique capable of restoring measured data from projection data with high accuracy and removing system noise included in the measured data, a signal processing device obtains measured data x including signal values of 0 or less by processing an output signal from a data acquisition system, and performs a conversion process on the measured data x by using a predefined function including a logarithmic function so as to generate projection data (logarithmically converted data z), in which the predefined function is a function of which an inverse function is present for values of a predetermined negative number s or more, and the measured data x including signal values of 0 or less within a predetermined range is restored from the projection data by applying the inverse function to the projection data.
    Type: Application
    Filed: January 23, 2015
    Publication date: January 5, 2017
    Inventors: Hisashi TAKAHASHI, Taiga GOTO, Koichi HIROKAWA