Patents by Inventor Masahiro Takizawa

Masahiro Takizawa 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: 8594766
    Abstract: In the continuous moving table imaging, high-speed imaging such as the echo planar method is implemented without deteriorating image quality, realizing a high-speed table movement, namely, high-speed imaging. In the magnetic resonance imaging apparatus, an imaging control means for controlling a magnetic field generation means, a transfer means, and a signal processing means executes an imaging sequence for applying multiple readout gradient magnetic fields to measure multiple nuclear magnetic resonance signals, after one-time application of an exciting RF pulse, while moving the transfer means. On this occasion, a positional deviation of the readout gradient magnetic fields given to the multiple nuclear magnetic resonance signals, caused by the movement of the transfer means, is calculated in advance as correction data, so that the measured nuclear magnetic resonance signals are corrected by the correction data.
    Type: Grant
    Filed: February 1, 2007
    Date of Patent: November 26, 2013
    Assignee: Hitachi Medical Corporation
    Inventors: Masahiro Takizawa, Tetsuhiko Takahashi
  • Patent number: 8594767
    Abstract: When multiple types of imaging are performed while moving a table on which a subject to be examined is placed, an imaging efficiency is improved and a high-quality image is obtained within a short time. Therefore, within a predetermined time interval such as an identical period of a periodic living body motion, a predetermined number of echo signals from each of the multiple types of imaging sequences are acquired and the table on which the subject to be examined is placed is moved. Along with the movement of the table, data items within the same range in the Ky-direction as to each of the imaging sequences are acquired, the moving speed of the table is controlled in such a manner that the acquired data items become continuous in the x-direction, and images are reconstructed based on the data items obtained respectively from the imaging sequences.
    Type: Grant
    Filed: February 1, 2008
    Date of Patent: November 26, 2013
    Assignee: Hitachi Medical Corporation
    Inventors: Masahiro Takizawa, Tetsuhiko Takahashi
  • Patent number: 8587306
    Abstract: The contrast of an image obtained by using a multi-echo sequence with hybrid-radial sampling is improved by dividing echo signal groups of one or more blocks measured by executing the imaging using the multi-echo sequence, into a plurality of partial echo signal groups, each of which is used to reconstruct an image with different contrast from each other.
    Type: Grant
    Filed: January 15, 2009
    Date of Patent: November 19, 2013
    Assignee: Hitachi Medical Corporation
    Inventor: Masahiro Takizawa
  • Patent number: 8582845
    Abstract: In nonlinear measurement in which a dephasing readout gradient magnetic field is not used, a positional shift of the k space data, which is caused by a difference between a readout gradient magnetic field actually applied and the calculated value, and a deterioration in the image quality resulting therefrom are reduced. In order to do so, in the invention, when executing an imaging pulse sequence including a nonlinear measurement which does not use a dephasing gradient magnetic field, a prescan sequence is executed and a correction value for correcting the shift of the readout gradient magnetic field from the set value is calculated from the data acquired in the prescan. When gridding the data acquired in the imaging pulse sequence, a parameter value of the gridding is corrected using the correction value to perform the gridding.
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: November 12, 2013
    Assignee: Hitachi Medical Corporation
    Inventors: Takehiro Ootsuka, Masahiro Takizawa
  • Publication number: 20130278972
    Abstract: The purpose of the present invention is to prevent a two-dimensional code to be additionally embedded from corrupting a two-dimensional code which has been embedded when a document in which the two-dimensional code has been embedded is copied or when a document in which the two-dimensional code has been embedded is overlaid on form data in which the two-dimensional code has been embedded. In the present invention, when it is detected that a second two-dimensional code is embedded in an input image, the input image is printed without overlay of a first two-dimensional code thereon. Furthermore, when form data for overlaying is stored, when it is detected that a third two-dimensional code is embedded in the form data or when it is detected that a second two-dimensional code is embedded in an input image, the input image is output without overlay of a first two-dimensional code thereon.
    Type: Application
    Filed: June 13, 2013
    Publication date: October 24, 2013
    Inventors: Akari Matsumura, Masahiro Takizawa
  • Publication number: 20130207654
    Abstract: In order to approximate the gradient magnetic field pulse waveform shape with high accuracy and improve the image quality at the time of imaging cross-section change or oblique imaging, an MRI apparatus of the present invention divides the waveform shape of the gradient magnetic field pulse into a plurality of sections, defines an approximation function for each section, and corrects the k-space coordinates at which the echo signal is arranged using the parameter of the approximation function. In addition, an optimal parameter of the approximation function of the waveform shape of the gradient magnetic field pulse is searched for using the measured signal.
    Type: Application
    Filed: October 28, 2011
    Publication date: August 15, 2013
    Applicant: Hitachi Medical Corporation
    Inventors: Masahiro Takizawa, Tetsuhiko Takahashi, Miyuki Kawamura
  • Publication number: 20130207653
    Abstract: There is provided an MRI apparatus capable of measuring the B1 distribution of an RF transmission coil in a short time with high accuracy. In order to realize this, imaging means of the MRI apparatus includes a B1 distribution measurement sequence that includes an application of a pre-pulse by RF radiation means and a plurality of signal acquisition sequences with different elapsed time (TI) from the pre-pulse. The signal acquisition sequence uses a pulse having a small flip angle as an RF pulse and is executed before the longitudinal relaxation after the pre-pulse ends. Calculation means calculates the B1 distribution of the RF radiation means using image data with different TI acquired in the respective signal acquisition sequences.
    Type: Application
    Filed: October 13, 2011
    Publication date: August 15, 2013
    Inventors: Kosuke Ito, Masahiro Takizawa
  • Patent number: 8493599
    Abstract: A printing apparatus includes a generation unit configured to generate first print data and second print data based on input print data, a printing unit configured to generate first image data by executing image processing on the first print data generated by the generation unit and to print the generated first image data on a sheet, a transmission unit configured to transmit the second print data generated by the generation unit to another printing apparatus connected to the printing apparatus, and a conveyance unit configured, in order to print the second print data transmitted by the transmission unit, to convey the sheet having the first image data printed thereon by the printing unit to the another printing apparatus.
    Type: Grant
    Filed: December 14, 2010
    Date of Patent: July 23, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventor: Masahiro Takizawa
  • Patent number: 8488205
    Abstract: The purpose of the present invention is to prevent a two-dimensional code to be additionally embedded from corrupting a two-dimensional code which has been embedded when a document in which the two-dimensional code has been embedded is copied or when a document in which the two-dimensional code has been embedded is overlaid on form data in which the two-dimensional code has been embedded. In the present invention, when it is detected that a second two-dimensional code is embedded in an input image, the input image is printed without overlay of a first two-dimensional code thereon. Furthermore, when form data for overlaying is stored, when it is detected that a third two-dimensional code is embedded in the form data or when it is detected that a second two-dimensional code is embedded in an input image, the input image is output without overlay of a first two-dimensional code thereon.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: July 16, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akari Matsumura, Masahiro Takizawa
  • Publication number: 20130170727
    Abstract: In multi-slice imaging of a magnetic resonance imaging apparatus based on a non-Cartesian sampling method in which an overlap portion is generated in k space, stable body movement correction is realized at high speed. In order to do so, the rotation and translation of an object is detected for each specific region (in the case of a hybrid radial method, each blade) using a most characteristic slice in the imaging region, and the detected body movement is used for body movement correction of the specific region in all slices. The slice used for correction may be determined using a mathematical analysis result, such as correlation. In addition, data collection and correction processing may be performed in parallel.
    Type: Application
    Filed: September 21, 2011
    Publication date: July 4, 2013
    Inventors: Miyuki Kawamura, Masahiro Takizawa
  • Patent number: 8466679
    Abstract: A susceptibility-emphasized image having a preferable signal-to-noise ratio can be obtained by a method including measuring a plurality of echo signals using the echo planar method, dividing the plurality of echo signals into a first echo signal group and a second echo signal group, acquiring an image data from the first echo signal group while acquiring a mask data from the second echo signal group, and obtaining the susceptibility-emphasized image through use of the image data and the mask data.
    Type: Grant
    Filed: December 16, 2008
    Date of Patent: June 18, 2013
    Assignee: Hitachi Medical Corporation
    Inventor: Masahiro Takizawa
  • Patent number: 8344729
    Abstract: An MRI apparatus includes an imaging means being provided with a means for generating magnetic fields respectively of a static magnetic field, a gradient magnetic field, and an RF magnetic field, and a means for receiving an echo signal generated from a subject, the imaging means being for measuring echo data associated with at least one measurement trajectory in k-space, while varying angles with respect to a coordinate axis in the k-space of the measurement trajectory, so as to collect at least one measured data for each of the angles; and an image reconstruction means for rearranging the measured data in the k-space and reconstructing an image; wherein, the image reconstruction means calculates a phase for correction based on standard data selected from the measured data for each of the angles, prior to rearranging the measured data in the k-space, and performs a phase correction as to the measured data, by using the phase for correction being calculated.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: January 1, 2013
    Assignee: Hitachi Medical Corporation
    Inventors: Masahiro Takizawa, Testuhiko Takahashi
  • Publication number: 20120300260
    Abstract: A printing apparatus that is capable of preventing a reduction of read rate and recovering a read error. A control unit manages controls of the entire apparatus. A storage unit is provided with a semiconductor nonvolatile storage device that is controlled by the control unit to store data and a storage control unit with a function that executes a refreshment operation for the semiconductor nonvolatile storage device at the time of reading the data. The control unit suppresses the refreshment operation when detecting an execution of a processing operation that requires a high processing speed, and permits the refreshment operation after the end the processing operation that requires the high processing speed.
    Type: Application
    Filed: May 23, 2012
    Publication date: November 29, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Masahiro Takizawa
  • Publication number: 20120226137
    Abstract: In order to further improve the accuracy of SAR estimation by accurately estimating, for each object, the energy of RF pulses absorbed into a part of an object, for example, a head, on the basis of measurement performed before main imaging, a nuclear magnetic resonance imaging apparatus estimates a head SAR by calculating a signal Sh generated from the head and a signal Sb generated from the whole object, calculating the ratio ? between the signal generated from the head and the signal generated from the whole object, and calculating the energy Eh absorbed into the head using the ratio of the signals.
    Type: Application
    Filed: November 25, 2010
    Publication date: September 6, 2012
    Inventors: Kosuke Ito, Masahiro Takizawa
  • Patent number: 8207734
    Abstract: An MRI apparatus capable of performing a high-speed operation for removing aliasing from the data measured by non-Cartesian imaging in a real space with a small amount of operation is provided. Non-Cartesian data sampling is performed by thinning the number of data by using multiple receiver coils having different sensitivity distribution from each other. Image reconstruction means creates orthogonal data by gridding non-orthogonal data obtained by each receiver coil on a grid having an equal spatial resolution to and a narrower field of view than a target image, subjects it to Fourier transform and creates the first image data containing aliasing components. The second image data is created by using the first image data created for each receiver coil and a sensitivity distribution of each receiver coil.
    Type: Grant
    Filed: March 3, 2008
    Date of Patent: June 26, 2012
    Assignee: Hitachi Medical Corporation
    Inventors: Tetsuhiko Takahashi, Masahiro Takizawa, Yasuhiro Kamada
  • Publication number: 20120141007
    Abstract: An image with a desired contrast is obtained while suppressing body motion artifacts caused by both random motion and periodic motion of an object. In order to do so, an imaging sequence using a non-Cartesian sampling method is executed so as to synchronize with a biological signal only at the start time and a repetition time (TR), which is an execution interval between shots within the imaging sequence, is maintained. In addition, a time difference between a delay time and a start time of each shot is calculated, and a shot with a predetermined time difference or more is executed again after the TR time.
    Type: Application
    Filed: August 2, 2010
    Publication date: June 7, 2012
    Applicant: SHENZHEN TRONY SCIENCE & TECHNOLOGY DEVELOPMENT CO., LTD.
    Inventors: Masahiro Takizawa, Tetsuhiko Takahashi, Tomohiro Goto, Takayuki Abe
  • Publication number: 20120113478
    Abstract: The purpose of the present invention is to prevent a two-dimensional code to be additionally embedded from corrupting a two-dimensional code which has been embedded when a document in which the two-dimensional code has been embedded is copied or when a document in which the two-dimensional code has been embedded is overlaid on form data in which the two-dimensional code has been embedded. In the present invention, when it is detected that a second two-dimensional code is embedded in an input image, the input image is printed without overlay of a first two-dimensional code thereon. Furthermore, when form data for overlaying is stored, when it is detected that a third two-dimensional code is embedded in the form data or when it is detected that a second two-dimensional code is embedded in an input image, the input image is output without overlay of a first two-dimensional code thereon.
    Type: Application
    Filed: January 20, 2012
    Publication date: May 10, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Akari Matsumura, Masahiro Takizawa
  • Publication number: 20120112745
    Abstract: In a non-Cartesian sampling method, a trajectory along which a measurement space is sampled is optimized. That is, data placed on one spiral trajectory heading outward from the center of the measurement space is sampled from a plurality of echo signals. The sampling is performed such that the data is placed continuously, without overlapping, in order from the center to the outside. Alternatively, the data may be overlapped and a mismatch between echo signals may be corrected using the data of the overlapped portion.
    Type: Application
    Filed: July 5, 2010
    Publication date: May 10, 2012
    Applicant: Hitachi Medical Corporation
    Inventors: Masahiro Takizawa, Yoshimasa Matsuda, Yasuhiro Kamada
  • Patent number: 8154294
    Abstract: In a non-cartesian sampling method, in order to reduce an artifact on an image caused by an error of a gradient magnetic field, data for correcting the error caused by the gradient magnetic field are obtained when data used for image reconstruction are obtained, and the data used for the image reconstruction are corrected by using the obtained data for the correction. In order to obtain the data for correcting the error, a block having plural parallel echo signals is measured.
    Type: Grant
    Filed: June 3, 2008
    Date of Patent: April 10, 2012
    Assignee: Hitachi Medical Corporation
    Inventors: Masahiro Takizawa, Tetsuhiko Takahashi
  • Patent number: 8115966
    Abstract: The purpose of the present invention is to prevent a two-dimensional code to be additionally embedded from corrupting a two-dimensional code which has been embedded when a document in which the two-dimensional code has been embedded is copied or when a document in which the two-dimensional code has been embedded is overlaid on form data in which the two-dimensional code has been embedded. In the present invention, when it is detected that a second two-dimensional code is embedded in an input image, the input image is printed without overlay of a first two-dimensional code thereon. Furthermore, when form data for overlaying is stored, when it is detected that a third two-dimensional code is embedded in the form data or when it is detected that a second two-dimensional code is embedded in an input image, the input image is output without overlay of a first two-dimensional code thereon.
    Type: Grant
    Filed: September 2, 2008
    Date of Patent: February 14, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akari Matsumura, Masahiro Takizawa