| 摘要 |
PURPOSE: To automatically set a region of interest(ROI) suitable for the area of an atrium, etc., in an ultrasonic diagnostic system. CONSTITUTION: The contour point detecting part 42 of an automatic ROI setting part 40 detects the contour point of a bloodstream area along each ultrasonic beam of sector scan. A centroid coordinate arithmetic part 44 finds the centroid of contour point groups from the coordinates of detected contour points. A moment of inertia arithmetic part 46 performs the coordinate transformation of the coordinate of each contour point to a centroid coordinate system setting the centroid as an origin, and finds the moment of inertia and products of inertia of the contour point group around each coordinate axis. An inertia main spindle arithmetic part 48 finds the inclination of an inertia main spindle for the centroid coordinate system based on the moment of inertia and the products of inertia. A ROI arithmetic part 50 finds the inertia main spindle based on the inclination, and decides the length of the major axis and minor axis of an elliptical ROI from the coordinate of the contour point in the neighborhood of the inertia main spindle, and sets the ROI so as to align the major axis and the minor axis with each inertia main spindle. |
