Patents by Inventor Takeshi Johkoh

Takeshi Johkoh 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).

  • Region extracting method for medical image
    Patent number: 7046833
    Abstract: From CT images having captured an abdomen, a two-dimensional characteristic space is assumed, in which X and Y axes indicate CT values of image data taken in first and second time phases different from each other. In this space, a two-dimensional histogram concerning respective pixels located at the same position in the two time phases is taken as a sample distribution of pixels. A two-variable distribution function is applied to this sample distribution, so as to estimate a matrix distribution of pixels corresponding to the whole liver region. According to this matrix distribution, a range of CT value of pixels corresponding to the liver region is estimated.
    Type: Grant
    Filed: May 21, 2002
    Date of Patent: May 16, 2006
    Assignee: AZE Ltd.
    Inventors: Jun Masumoto, Yoshinobu Sato, Masatoshi Hori, Takamichi Murakami, Takeshi Johkoh, Hironobu Nakamura, Shinichi Tamura, Masaki Miyamoto
  • Projection conversion device and method and elapsed-time differential image preparation device and method
    Publication number: 20040114790
    Abstract: A projection conversion system for producing a 2-dimensional chest projection image from a 3-dimensional chest CT data set includes a temporal subtraction image production section 7 for producing a temporal subtraction image from a pair of 2-dimensional chest projection images which are produced by making transformation of temporally sequential two 3-dimensional chest CT data sets at a projection transformation calculation section 5, and an image display section 9 capable of displaying the temporal subtraction image.
    Type: Application
    Filed: November 17, 2003
    Publication date: June 17, 2004
    Inventors: Keiji Yamamoto, Akiko Baba, Takeshi Johkoh, Shuji Yamamoto, Hironobu Nakamura
  • Region extracting method for medical image
    Publication number: 20020181754
    Abstract: From CT images having captured an abdomen, a two-dimensional characteristic space is assumed, in which X and Y axes indicate CT values of image data taken in first and second time phases different from each other. In this space, a two-dimensional histogram concerning respective pixels located at the same position in the two time phases is taken as a sample distribution of pixels. A two-variable distribution function is applied to this sample distribution, so as to estimate a matrix distribution of pixels corresponding to the whole liver region. According to this matrix distribution, a range of CT value of pixels corresponding to the liver region is estimated.
    Type: Application
    Filed: May 21, 2002
    Publication date: December 5, 2002
    Applicant: Medical Imaging Laboratory, Ltd.
    Inventors: Jun Masumoto, Yoshinobu Sato, Masatoshi Hori, Takamichi Murakami, Takeshi Johkoh, Hironobu Nakamura, Shinichi Tamura, Masaki Miyamoto