公开(公告)号：JPH07250835A

公开(公告)日：1995-10-03

申请号：JP28392094

申请日：1994-10-25

Applicant: ADVANCED TECH LAB

Inventor： JIEFURII II PAWAAZU ,  SANASHISU RUUPASU

IPC: A61B8/06 ,  G01S7/52 ,  G01S15/52 ,  G01S15/58 ,  G01S15/89

Abstract: PURPOSE: To enable to prevent reduction of a frequency depending on the depth of a measurement object by utilizing all information components existing in the band of echo signals in measurement of a fluid flow by pulse Doppler signal transmission. CONSTITUTION: An ultrasonic pulse is generated from an operation head 10 in a fan shaped area 26 of a patient and an echo returning to the sample volume of the patient is made into a numeric by a receiver 14 to be an independent echo sample. The echo signal made into a numeric is properly delayed by a beam former 16 and weighted, then is stored in one longitudinal array of a two-dimensions array store 22. Products of samples neighboring each other in each longitudinal direction of the array are calculated by a row autocorrelation device 34 to obtain a secondary autocorrelation function and the speed of the sample volume is estimated by a speed processing device 36 based on the output of those correlation devices 32, 34 to be utilized in image processing.