Dynamic adaptation of a dephasing gradient pair

US8975893B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Andreas Greiser · Erlangen, DE
• Peter Speier · Erlangen, DE

Key dates

• Filing date: Apr 20, 2012
• Grant date: Mar 10, 2015
• Expiry date: Sep 6, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/5635
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In a method for optimization of a flow coding with switching of an additional bipolar dephasing gradient pair, used in a magnetic resonance (MR) phase contrast angiography, the strength of the flow coding is selected depending on the flow velocity in the vessels that should be depicted. MR signals of an examination region are acquired with continuously running overview measurements, with an operator-selected flow coding strength. After the selected flow coding strength is adopted automatically for the next measurement of the continuously running overview measurements, and two partial measurements with different flow codings are implemented for each selected strength and a phase difference image from the two partial measurements is calculated and depicted in real time, and the selected flow coding strength is automatically adopted for the MR phase contrast angiography.