The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 26, 1988
Filed:
Dec. 22, 1986
Kouroku Namekawa, Tokyo, JP;
Aloka Co., Ltd., Tokyo, JP;
Abstract
An ultrasonic Doppler diagnostic apparatus usable for ultrasonic image diagnostics accurately determines and displays the velocity of moving reflective members within a subject under observation by transmitting an ultrasonic beam into the subject and receiving the echoes reflected by the moving reflective members. The apparatus comprises a memory for storing a first velocity distribution obtained from a first signal received from a given direction, and a tangential velocity calculator for calculating a tangential velocity distribution in a direction tangential to an arc of a scanned sector by comparing said first velocity distribution within a second velocity distribution obtained from a second signal received from a direction deflected by a small angle with respect to the direction of the first signal. When the apparatus is to be adapted for determining velocity by the autocorrelation method, it is provided with a memory for storing a first autocorrelation signal output by an autocorrelator and a tangential velocity calculator for calculating the tangential velocity distribution from the first autocorrelation and a second autocorrelation having a slightly different angle of deflection. The vectorial velocity of the moving reflective body is determined from the tangential velocity obtained by the tangential velocity calculator so that it is easily possible to obtain accurate velocity information including movement direction information with respect to the moving reflective member without need of transmitting ultrasonic beams from two separated locations. The apparatus thus provides accurate and useful information for use in image diagnostics.