Method for obtaining data in phase-contrast MR angiography

US5206591A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Richard Hausmann · Erlangen, DE
• Gerhard Laub · Burlingame, US

Key dates

• Filing date: Oct 23, 1991
• Grant date: Apr 27, 1993
• Expiry date: Oct 23, 2011

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/56316
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

For obtaining data in phase contrast MR angiography, which data is sensitive to flow in a sample in three-orthogonal directions, a sequence with four steps is applied to a sample. In the first step, spins are flow encoded with a positive polarity in all three directions. During the three further steps, flow encoding is inverted in one direction and kept positive in all other directions, with the direction having the inverted polarity being different in all three of the further steps. A raw data set for each of the directions is obtained by complex subtraction of the signals obtained by one of the further steps and of the signals obtained by the first step.