Hitachi, Ltd.

Aze Ltd.

Yoshinobu Sato

Jun Masumoto

Masaki Miyamoto

Ichiro Sakuma

Yasuyuki Momoi

Takeyoshi Dohi

Nobuhiko Sugano

Kazuo Yonenobu

Takahiro Ochi

Shinichi Tamura

Yoshikazu Nakajima

Toshihiko Sasama

Masatoshi Hori

Takamichi Murakami

Takeshi Johkoh

Madoka Sugiura

Hironobu Nakamura

A position measuring apparatus, for use in an assisting apparatus for surgical opertions, includes a position indicating apparatus for indicating a position and a direction of a tool, and three-dimensional position measuring apparatus for measuring a position and a direction of a surgical field and also the position and the direction of the tool. The position indicating apparatus and the three dimensional position measuring apparatus are unified in one body in the relative position thereof, so that a position for assistance of surgical operation is indicated in the form of an intersection line or an intersection point of the laser beams, irrespective of the position of the position measuring apparatus.

Position measuring apparatus

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.

Region extracting method for medical image

Growing community of inventors

Suita, Japan

Yoshinobu Sato