Method of MR (=magnetic resonance) with spatial encoding to generate an image or spectroscopic data

US8791700B2 · kind B2 · utility

Assignee

• UNIVERSITAETSKLINIKUM FREIBURG · DE

Inventors

• Walter Witschey · Philadelphia, US
• Daniel Gallichan · Glückstadt, DE
• Maxim Zaitsev · Glückstadt, DE
• Gerrit Schultz · Glückstadt, DE
• Juergen Hennig · Glückstadt, DE

Key dates

• Filing date: Jul 20, 2011
• Grant date: Jul 29, 2014
• Expiry date: Jul 11, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/4833
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method of MR with spatial encoding to generate an image or spectroscopic data of an object of investigation inside an MR apparatus comprises the steps of (a) selecting a volume of interest within the object of investigation, (b) applying an RF pulse to generate a transverse magnetization within the object of investigation, (c) preparing a nonlinear phase distribution within the object of investigation by application of spatially encoding magnetic fields (SEMs), the SEMs comprising of a nonlinear gradient field or a combination of linear and nonlinear gradient fields, (d) effecting primary spatial encoding through application of SEMs, and (e) recording MR signals originating from the object of investigation. Step (c) or (d) thereby comprises applying a sequence of at least two SEMs, at least one of which contains a nonlinear field gradient and at least two of the SEMs having different field geometries. The sequence of SEMs is applied at a point in time from and including the excitation of the object of interest in step (b) up to and including the recording of the MR signals in step (e), to thereby introduce a temporal shift of the signals arising from spatially different locations…