Three-dimensional derivation of a proximal isokinetic shell of a proximal flow convergence zone and three-dimensional PISA flow measurement

US8911375B2 · kind B2 · utility

Assignee

• Tomtec Imaging Systems GmbH · DE

Inventors

• Marcus Schreckenberg · Freising, DE
• Georg Schummers · Munich, DE

Key dates

• Filing date: Oct 19, 2009
• Grant date: Dec 16, 2014
• Expiry date: Feb 2, 2031

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B8/06
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

The invention relates to a device and to a method for adaptive three-dimensional derivation of a proximal isokinetic shell of a proximal flow convergence zone that forms in an observation area in a moving fluid, wherein the magnitude of the velocity of the fluid at each point of the proximal isokinetic shell is identical and equal to a velocity reference value, the method including: a) preparing locally distributed velocity measurements in a surrounding area of the observation area, the measurements representing at least one directional component of the local velocity of the fluid in a respective measurement direction, b) preparing an approximation surface as an initial proximal isokinetic shell) in such a way that the entire flow, at least substantially, in the flow convergence zone penetrates the approximation surface, c) establishing a plurality of approximation points on the approximation surface, d) determining the respective velocity measurements at the respective approximation points, e) calculating a corrected velocity (vkkJ) at each approximation point as a function of the velocity measurement indicated there, the respective measurement direction; and the respective surfac…