APPARATUS FOR CALCULATING
COORDINATE DATA OF DESIRED POINT
IN SUBJECT TO BE EXAMINED
 Inventor: Yoshio Machida, Tochigi, Japan
 Assignee: Kabushild Kaisha Toshiba, Japan
 Appl. No.: 953,760
 Filed: Sep. 29,1992
Related U.S. Application Data
 Continuation of Ser. No. 580,762, Sep. 11, 1990, abandoned.
 Foreign Application Priority Data
Sep. 12, 1989 [JP] Japan 1-236489
 Int. CI.' A61B 5/055
 U.S. CI 128/653.2; 606/130
 Field of Search 128/653.1, 653.2, 653.5;
 References Cited
U.S. PATENT DOCUMENTS
4,228,799 10/1980 Anichkov et al 606/130
4,644,276 2/1987 Sierocuk et al. .
Primary Examiner—Ruth S. Smith
Attorney, Agent, or Firm—Limbach & Limbach
A method of calculating coordinate data of a desired point in a subject to be examined is disclosed. A phantom image is obtained by integrally photographing a second frame, a frame coordinate phantom, and a second indicator phantom by using a computed tomographic apparatus. A subject image is then obtained by integrally photographing a first frame, the subject, and a first indicator phantom at the same position assumed when the phantom image is photographed. Coordinate data is obtained by correcting the deviation between the coordinates of the subject on the real space and the coordinates of the subject on the image photographed by the computed tomographic apparatus.
8 Claims, 14 Drawing Sheets