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:
Oct. 22, 1991
Filed:
Aug. 29, 1990
John C Lazenby, Unincorporated Area, WA (US);
Quantum Medical Systems, Incorporated, Issaquah, WA (US);
Abstract
A method and apparatus for estimating blood flow velocities with an ultrasound imaging system. The method includes radiating a plurality of ultrasound beams having a fixed phase relationship with a reference frequency; receiving a plurality of successive echoes from the successive beams from the same volume of blood; and estimating the blood flow velocity from the phase shift changes, relative to the reference frequency, between a plurality of successive echo pairs by multiplying each phase shift change by coefficients stored in a RAM and accumulating the results. Desirably, the phase shift changes between the multiple pairs of successive echoes are weight averaged during the multiplication and accumulation process to arrive at the velocity estimate. A method of improving the blood flow velocity estimate at a given volume by obtaining velocity estimates at a plurality of contiguous volumes and multiplying each velocity estimate by coefficients stored in a RAM and accumulating the products to arrive at a substitute velocity estimate at the given volume.