JPS645534A - Ultrasonic diagnostic apparatus - Google Patents

Abstract

PURPOSE:To confirm the position of an abnormal distribution part and the degree of abnormal distribution at a glance, by displaying the shape parameter of a local amplitude frequency distribution shape as a two-dimensional image from the image obtained by normalizing the data of an effective B-mode image under a constant condition. CONSTITUTION:Weighting processing 33 is performed from the output value w(i, j) of a CFAR processing circuit 31 (Fig. a) and the data y(i, j) of a B-mode memory 32. As a result, the image converting processing 34 of w(i, j), y(i, j) (Fig. c) is performed to obtain v(i, j) (Fig. d). With respect to v(i, j), either one of the average value M0, dispersion M1, dispersion/value M0, dispersion M1, dispersion/average value M0/M1, the min. value MI, the max. value MA, distribution width MA-MI and MA-MI/M0 becoming the shape parameters of the local amplitude frequency distribution in a ROI(k, l) is calculated by an operation circuit 35 (Fig. e). The processing of the circuit 35 is repeated with respect to k, l to obtain two-dimensional parameter image u(i, j) (Fig. 36 and Fig. f).