Patents by Inventor Katsuyuki Taguchi
Katsuyuki Taguchi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20050226365Abstract: A method, X-ray CT apparatus, and computer program product for obtaining data from a computed tomography (CT) scan, wherein projection data are obtained from at least two detector rows in a CT system, the projection data are filtered in a direction of the at least two detector rows to obtain filtered data in which windmill artifacts are reduced, and the filtered data are reconstructed.Type: ApplicationFiled: March 30, 2004Publication date: October 13, 2005Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MEDICAL SYSTEMS CORPORATIONInventor: Katsuyuki Taguchi
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Patent number: 6917663Abstract: A method for obtaining data from CT scans, including obtaining projection data from at least one detector row in a CT system; applying a weighting function including cone-angle dependent weight to projection data; filtering weighted data; and backprojecting weighted data while accounting for cone-angle. The method finds application to an X-ray CT apparatus, including a helical scanning device configured to collect projection data while at least one of a gantry and a couch moves along an axial direction, the helical scanning device including an X-ray source to generate X-rays, and a detector having detector elements arranged in rows along the axial direction to produce projection data; and a processor, which includes a weighting device to apply a weighting function including cone-angle dependent weight to projection data, thereby obtaining weighted data, a filtering device to filter weighted data, and a backprojecting device to backproject weighted data while accounting for cone-angle.Type: GrantFiled: June 16, 2003Date of Patent: July 12, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Katsuyuki Taguchi, Be-Shan Su Chiang
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Patent number: 6907100Abstract: An X-ray CT system is equipped with a gantry, couch and control cabinet and configured to scan a cone-beam X-ray toward an object along a given orbit to acquire cone-beam data in which a three-dimensional distribution of an X-ray absorption coefficient within the object is reflected. The control cabinet decides a degree of reliability for the cone-beam data according to an acquisition time of the cone-beam data, and then decides a weight for three-dimensional Radon data from the cone-beam data on the basis of the degree of reliability. Using this weight, the control cabinet reconstructs the three-dimensional Radon data based on a three-dimensional reconstruction algorithm. Thus, when the three-dimensional reconstruction algorithm for cone-beam CT is applied to medical CT, artifacts attributable to object's motion can be suppressed and temporal resolution can be improved.Type: GrantFiled: October 24, 2002Date of Patent: June 14, 2005Assignee: Kabushiki Kaisha ToshibaInventor: Katsuyuki Taguchi
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Patent number: 6904117Abstract: An X-ray computed tomography apparatus includes a helical scanning device configured to collect projection data while at least one of a gantry and a couch moves along a body axial direction of an object on the couch when at least one of the gantry and the couch is tilted, the helical scanning device including an X-ray source configured to generate X-rays, and a detector disposed opposite the X-ray source and having detector elements arranged in a plurality of rows along the body axial direction, and a reconstructing device configured to reconstruct an image based on the projection data using cone-beam Feldkamp reconstruction.Type: GrantFiled: October 30, 2002Date of Patent: June 7, 2005Assignee: Toshiba CorporationInventors: Ilmar Arthur Hein, Katsuyuki Taguchi
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Publication number: 20050111611Abstract: An X-ray computed tomography apparatus includes a helical scanning device configured to collect projection data while at least one of a gantry and a couch moves along a body axial direction of an object on the couch when at least one of the gantry and the couch is tilted, the helical scanning device including an X-ray source configured to generate X-rays, and a detector disposed opposite the X-ray source and having detector elements arranged in a plurality of rows along the body axial direction, and a reconstructing device configured to reconstruct an image based on the projection data using cone-beam Feldkamp reconstruction.Type: ApplicationFiled: December 30, 2004Publication date: May 26, 2005Applicant: KABUSHHIKI KAISHA TOSHIBAInventors: Ilmar Hein, Katsuyuki Taguchi
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Publication number: 20050089313Abstract: A recording and playback apparatus includes a video storing device for recording and playing back the sequential scan video signal captured by a sequential scan image pickup device through a light input and output from the sequential scan image pickup device for i frames (i is an integer not smaller than 1) over a period of time T1 (T1 is a positive number). Also included in the recording and playback apparatus is a sequential scan/interlaced scan converting device generating an interlaced scan video signal for m fields (m is an integer not smaller than 2) from each frame of the played back i-frame sequential scan video signal, wherein the interlaced scan video signal is output for i×m fields over a period of time T2 (T2 is a number larger than T1).Type: ApplicationFiled: April 15, 2003Publication date: April 28, 2005Applicant: Matsushita Electric Industrial Co., LtdInventors: Noriaki Wada, Yasushi Fukushima, Katsuyuki Taguchi
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Publication number: 20040252806Abstract: A method for obtaining data from CT scans, including obtaining projection data from at least one detector row in a CT system; applying a weighting function including cone-angle dependent weight to projection data; filtering weighted data; and backprojecting weighted data while accounting for cone-angle. The method finds application to an X-ray CT apparatus, including a helical scanning device configured to collect projection data while at least one of a gantry and a couch moves along an axial direction, the helical scanning device including an X-ray source to generate X-rays, and a detector having detector elements arranged in rows along the axial direction to produce projection data; and a processor, which includes a weighting device to apply a weighting function including cone-angle dependent weight to projection data, thereby obtaining weighted data, a filtering device to filter weighted data, and a backprojecting device to backproject weighted data while accounting for cone-angle.Type: ApplicationFiled: June 16, 2003Publication date: December 16, 2004Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Katsuyuki Taguchi, Be-Shan Su Chiang
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Publication number: 20040212690Abstract: A pickup 1 generates a video signal based on an arbitrarily set frame rate. A frame rate converter 2 converts a frame rate of the video signal output from the pickup 1 into a predetermined frame rate. Frame rate conversion information output units 6 and 4 output information on frame rate conversion in a manner corresponding to a video signal after the frame rate conversion.Type: ApplicationFiled: January 29, 2004Publication date: October 28, 2004Inventors: Hiromi Nakase, Shinji Takemoto, Yukio Shimamura, Akiyuki Noda, Katsuyuki Taguchi
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Patent number: 6778630Abstract: A method and system for reconstructing an x-ray image from a partial orbit through the use of a “virtual” fan angle. The virtual fan angle is determined based upon the range of angular positions spanned by a source in a CT instrument or a selected smaller angle. Exposure data is obtained and he virtual fan angle is used to weight the exposure data. Image reconstruction can then proceed using the weighted exposure data. The described methods and system also function for data collected over a complete orbit.Type: GrantFiled: March 25, 2002Date of Patent: August 17, 2004Assignee: Kabushiki Kaisha ToshibaInventors: Michael D. Silver, Katsuyuki Taguchi
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Publication number: 20040086075Abstract: An X-ray computed tomography apparatus includes a helical scanning device configured to collect projection data while at least one of a gantry and a couch moves along a body axial direction of an object on the couch when at least one of the gantry and the couch is tilted, the helical scanning device including an X-ray source configured to generate X-rays, and a detector disposed opposite the X-ray source and having detector elements arranged in a plurality of rows along the body axial direction, and a reconstructing device configured to reconstruct an image based on the projection data using cone-beam Feldkamp reconstruction.Type: ApplicationFiled: October 30, 2002Publication date: May 6, 2004Applicant: KABUSHHIKI KAISHA TOSHIBAInventors: Ilmar Arthur Hein, Katsuyuki Taguchi
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Publication number: 20040086074Abstract: An X-ray CT system is equipped with a gantry, couch and control cabinet and configured to scan a cone-beam X-ray toward an object along a given orbit to acquire cone-beam data in which a three-dimensional distribution of an X-ray absorption coefficient within the object is reflected. The control cabinet decides a degree of reliability for the cone-beam data according to an acquisition time of the cone-beam data, and then decides a weight for three-dimensional Radon data from the cone-beam data on the basis of the degree of reliability. Using this weight, the control cabinet reconstructs the three-dimensional Radon data based on a three-dimensional reconstruction algorithm. Thus, when the three-dimensional reconstruction algorithm for cone-beam CT is applied to medical CT, artifacts attributable to object's motion can be suppressed and temporal resolution can be improved.Type: ApplicationFiled: October 24, 2002Publication date: May 6, 2004Applicant: KABUSHIKI KAISHA TOSHIBAInventor: Katsuyuki Taguchi
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Publication number: 20030123614Abstract: A method and system for reconstructing an x-ray image from a partial orbit through the use of a “virtual” fan angle. The virtual fan angle is determined based upon the range of angular positions spanned by a source in a CT instrument or a selected smaller angle. Exposure data is obtained and he virtual fan angle is used to weight the exposure data. Image reconstruction can then proceed using the weighted exposure data. The described methods and system also function for data collected over a complete orbit.Type: ApplicationFiled: March 25, 2002Publication date: July 3, 2003Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Michael D. Silver, Katsuyuki Taguchi
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Patent number: 6584166Abstract: An X-ray computerized tomographic apparatus includes an X-ray tube device configured to irradiate an object to be examined with a pyramidal X-ray beam, a detector which has a plurality of detecting elements arrayed in a slice direction in which X-rays transmitted through the object are detected, a data extending unit which creates virtual data corresponding to an extension region located outside a region in which the detecting elements are arranged in the slice direction on the basis of real data detected by the detecting element, and a reconstructing unit which reconstructs image data on the basis of the real data and virtual data.Type: GrantFiled: March 28, 2002Date of Patent: June 24, 2003Assignee: Kabushiki Kaisha ToshibaInventor: Katsuyuki Taguchi
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Patent number: 6546067Abstract: A method, system, and computer-readable medium that can resolve continuous and/or relatively rapid changes with time of a volume V without deterioration in image quality. In one embodiment of this invention, a subset of the projection data collected along a continuous circular orbit is combined with projection data collected along a different orbit to reconstruct the volume V substantially as it was when the subset of the projection data was collected. In one embodiment, the different orbit is a linear or a helical orbit. Further, staggered subsets of the projection data collected along a continuous circular orbit can also be used, as can further projection data collected along a linear orbit to resolve continuous and/or relatively rapid changes of a volume V.Type: GrantFiled: January 30, 2001Date of Patent: April 8, 2003Assignee: Kabushiki Kaisha ToshibaInventors: Hiroshi Aradate, Yasuo Saito, Katsuyuki Taguchi
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Patent number: 6466640Abstract: Method and system for computed tomography. Data is collected by irradiating a subject with x-rays. The data is interpolated and then weighted based upon the data collection time. The interpolated and weighted data is then used to reconstruct the image using fan beam reconstruction. The weighting function may by shifted in time. Signals may be obtained from the subject and used to control exposure, reduce the dose and provide automatic volumetric cardiac reconstruction. The method and system can increase the temporal and spatial resolution, and reconstruct images at different timing.Type: GrantFiled: November 26, 1999Date of Patent: October 15, 2002Assignee: Kabushiki Kaisha ToshibaInventor: Katsuyuki Taguchi
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Publication number: 20020141531Abstract: An X-ray computerized tomographic apparatus includes an X-ray tube device configured to irradiate an object to be examined with a pyramidal X-ray beam, a detector which has a plurality of detecting elements arrayed in a slice direction in which X-rays transmitted through the object are detected, a data extending unit which creates virtual data corresponding to an extension region located outside a region in which the detecting elements are arranged in the slice direction on the basis of real data detected by the detecting element, and a reconstructing unit which reconstructs image data on the basis of the real data and virtual data.Type: ApplicationFiled: March 28, 2002Publication date: October 3, 2002Inventor: Katsuyuki Taguchi
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Publication number: 20020131544Abstract: A method, system, and computer-readable medium that can resolve continuous and/or relatively rapid changes with time of a volume V without deterioration in image quality. In one embodiment of this invention, a subset of the projection data collected along a continuous circular orbit is combined with projection data collected along a different orbit to reconstruct the volume V substantially as it was when the subset of the projection data was collected. In one embodiment, the different orbit is a linear or a helical orbit. Further, staggered subsets of the projection data collected along a continuous circular orbit can also be used, as can further projection data collected along a linear orbit to resolve continuous and/or relatively rapid changes of a volume V.Type: ApplicationFiled: January 30, 2001Publication date: September 19, 2002Applicant: Kabushiki Kaisha ToshibaInventors: Hiroshi Aradate, Yasuo Saito, Katsuyuki Taguchi
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Patent number: 6415012Abstract: An X-ray CT apparatus includes an X-ray source for generating X-rays, a detector having detector elements laid out in a plurality of rows in a body axial direction of an object on a couch for detecting X-rays transmitted through the object, and a helical data collector that collects helical data while at least one of a gantry and the couch is moved by a moving device along a body axial direction of the object on the couch in a state that at least one of the gantry and the couch is tilted. A data processor is further provided that reconstructs an image by interpolating the helical data collected and converting it into parallel beam data that is tilt corrected.Type: GrantFiled: February 16, 2000Date of Patent: July 2, 2002Assignee: Kabushiki Kaisha ToshibaInventors: Katsuyuki Taguchi, Tatsuro Suzuki
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Patent number: 6215843Abstract: An X-ray CT scanner for producing a CT image of a subject by scanning an X-ray fan beam radiated an X-ray source through the subject in a predetermined slice-thickness direction. The scanner comprises a main detector detecting the X-ray beam to produce an X-ray transmission data of a subject and to a plurality of slices in agreement with unequal segment pitches. The detector comprises a two-dimensional array consisting of a plurality of X-ray detecting elements receiving the X-ray beam and being disposed in the slice-thickness direction as a row line and a channel direction as a column line.Type: GrantFiled: October 30, 1997Date of Patent: April 10, 2001Assignee: Kabushiki Kaisha ToshibaInventors: Yasuo Saito, Katsuyuki Taguchi, Hiroshi Aradate
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Patent number: 6196715Abstract: An X-ray tomosynthesis system as an X-ray diagnostic system is provided. The system comprises an X-ray generator irradiating an X-ray toward a subject, and a planar-type X-ray detector detecting the X-ray passing through the subject and outputting two dimensional imaging signals based on the detected X-ray. The system comprises a supporting/moving mechanism supporting at least one of the X-ray generator and the X-ray detector so that the at least one is moved relatively to the subject.Type: GrantFiled: April 27, 1998Date of Patent: March 6, 2001Assignee: Kabushiki Kaisha ToshibaInventors: Kyojiro Nambu, Katsuyuki Taguchi, Satoru Oishi